The research team is interested in modelling the entire energy chain, from production to consumption, including distribution and supervision. Understanding the precise physical functioning of production machines allows us to rationalise their use and use them for storage. An essential numerical part completes the work by proposing models of energy distribution networks and communication systems necessary for the optimisation of the whole.
Based on all engineering fields, innovative materials and structures are experiencing considerable growth. This involves the development of new technologies, including additive manufacturing and intelligent materials. The research team participates in this field of research by focusing on three subjects: multi-scale modelling of materials; improvement of additive manufacturing processes and characterisation of the performance of new materials.
Complex fluid modelling concerns all fluids that cannot be described by the Navier-Stokes equations. Most of the problems studied are related to complex fluid dynamics and multiphase flows, in particular fluid-particle interactions. The research developed involves interdisciplinary collaboration between several scientific fields. We propose a mathematical and numerical analysis of these fluids with industrial applications.
The professors and researchers of the Modeling Group
Publications of the professors and researchers of the Modeling Group
Arreola, Fernanda; Clain, Pascal
Quantum startup: using an analogy for theory development in the study of breakthrough innovation. Proceedings Article
In: OMT - IAE Business School PDW, Organization & Management Theory Academy of Management, Derqui, Argentina, 2022.
@inproceedings{arreola_1913,
title = {Quantum startup: using an analogy for theory development in the study of breakthrough innovation.},
author = {Fernanda Arreola and Pascal Clain},
url = {x},
year = {2022},
date = {2022-12-01},
booktitle = {OMT - IAE Business School PDW},
publisher = {Academy of Management},
address = {Derqui, Argentina},
organization = {Organization & Management Theory},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Vanaei, Hamidreza; Magri, Anouar El; Rastak, Mohammadali; Vanaei, Saeedeh; Vaudreuil, Sébastien; Tcharkhtchi, Abbas
Numerical-Experimental Analysis toward the Strain Rate Sensitivity of 3D-Printed Nylon Reinforced by Short Carbon Fiber Journal Article
In: Materials, vol. 15, no. 24, pp. 8722, 2022.
@article{vanaei_2061,
title = {Numerical-Experimental Analysis toward the Strain Rate Sensitivity of 3D-Printed Nylon Reinforced by Short Carbon Fiber},
author = {Hamidreza Vanaei and Anouar El Magri and Mohammadali Rastak and Saeedeh Vanaei and Sébastien Vaudreuil and Abbas Tcharkhtchi},
url = {https://doi.org/10.3390/ma15248722},
year = {2022},
date = {2022-12-01},
journal = {Materials},
volume = {15},
number = {24},
pages = {8722},
abstract = {Despite the application of the Additive Manufacturing process and the ability of parts' construction directly from a 3D model, particular attention should be taken into account to improve their mechanical characteristics. In this paper, we present the effect of individual process variables and the strain-rate sensitivity of Onyx (Nylon mixed with chopped carbon fiber) manufactured by Fused Filament Fabrication (FFF), using both experimental and simulation manners. The main objective of this paper is to present the effect of the selected printing parameters (print speed and platform temperature) and the sensitivity of the 3D-printed specimen to the strain rate during tensile behavior. A strong variation of tensile behavior for each set of conditions has been observed during the quasi-static tensile test. The variation of 40 °C in the platform temperature results in a 10% and 11% increase in Young's modulus and tensile strength, and 8% decrease in the failure strain, respectively. The variation of 20 mm·s?1 in print speed results in a 14% increase in the tensile strength and 11% decrease in the failure strain. The individual effect of process variables is inevitable and affects the mechanical behavior of the 3D-printed composite, as observed from the SEM micrographs (ductile to brittle fracture). The best condition according to their tensile behavior was chosen to investigate the strain rate sensitivity of the printed specimens both experimentally and using Finite Element (FE) simulations. As observed, the strain rate clearly affects the failure mechanism and the predicted behavior using the FE simulation. Increase in the elongation speed from 1 mm·min?1 to 100 mm·min?1, results in a considerable increase in Young's modulus. SEM micrographs demonstrated that although the mechanical behavior of the material varied by increasing the strain rate, the failure mechanism altered from ductile to brittle failure.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Vaudreuil, Sébastien; Bencaid, Salah Eddine; Vanaei, Hamidreza; Magri, Anouar El
Effects of Power and Laser Speed on the Mechanical Properties of AlSi7Mg0.6 Manufactured by Laser Powder Bed Fusion Journal Article
In: Materials, vol. 15, no. 23, pp. 8640, 2022.
@article{vaudreuil_2062,
title = {Effects of Power and Laser Speed on the Mechanical Properties of AlSi7Mg0.6 Manufactured by Laser Powder Bed Fusion},
author = {Sébastien Vaudreuil and Salah Eddine Bencaid and Hamidreza Vanaei and Anouar El Magri},
url = {https://doi.org/10.3390/ma15238640},
year = {2022},
date = {2022-12-01},
journal = {Materials},
volume = {15},
number = {23},
pages = {8640},
abstract = {The AlSi7Mg0.6 alloy, with its good tolerance against strain, is used in laser powder bed fusion (LPBF) to produce parts with complex geometries for aerospace engineering. Production of parts with good mechanical strength requires, however, the optimization of laser parameters. This study thus evaluated the influence of scanning speed, laser power, and strategy on several mechanical properties (tensile/resilience/hardness) to identify an optimal processing region. Results have shown the profound influence of laser power and scanning speed on mechanical properties, with a limited influence from the laser strategy. Tensile strength values ranging from 122 to 394 MPa were obtained, while Young's Modulus varied from 17 to 29 GPa, and the elongation at break ranged from 2.1 to 9.8%. Surface plots of each property against laser power and speed revealed a region of higher mechanical properties. This region is found when using 50 µm thick layers for energy densities between 25 and 35 J/mm3. Operating at higher values of energy density yielded sub-optimal properties, while a lower energy density resulted in poor performances. Results have shown that any optimization strategy must not only account for the volumic energy density value, but also for laser power itself when thick layers are used for fabrication. This was shown through parts exhibiting reduced mechanical performances that were produced within the optimal energy density range, but at low laser power. By combining mid-speed and power within the optimal region, parts with good microstructure and limited defects such as balling, keyhole pores, and hot cracking will be produced. Heat-treating AlSi7Mg0.6 parts to T6 temper negatively affected mechanical performances. Adapted tempering conditions are thus required if improvements are sought through tempering.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Bottino, Alberto; Falessi, Matteo Valerio; Hayward-Schneider, Thomas; Biancalani, Alessandro; Briguglio, Sergio; Hatzky, R; Lauber, Philipp; Mishchenko, Alexey; Poli, Emanuele; Rettino, B; Vannini, Francesco; Wang, Xin; Zonca, Fulvio
Time evolution and finite element representation of Phase Space Zonal Structures in ORB5 Journal Article
In: Journal of Physics: Conference Series, vol. 2397, pp. 012019, 2022.
@article{bottino_2298,
title = {Time evolution and finite element representation of Phase Space Zonal Structures in ORB5},
author = {Alberto Bottino and Matteo Valerio Falessi and Thomas Hayward-Schneider and Alessandro Biancalani and Sergio Briguglio and R Hatzky and Philipp Lauber and Alexey Mishchenko and Emanuele Poli and B Rettino and Francesco Vannini and Xin Wang and Fulvio Zonca},
url = {https://dx.doi.org/10.1088/1742-6596/2397/1/012019},
year = {2022},
date = {2022-12-01},
journal = {Journal of Physics: Conference Series},
volume = {2397},
pages = {012019},
abstract = {Phase Space Zonal Structures (PSZSs), obtained by averaging out dependencies on angle-like variables in the energetic particle (EP) distribution function, play a fundamental role in regulating EP transport induced by Alfvén instabilities in burning plasmas, acting as a slowly varying nonlinear equilibrium state. Therefore, they are of great interest for the development of reduced models for the description of EP heat and particle transport on long time scales, comparable with the energy confinement time, for future burning plasma experiments. In this work, we propose an efficient finite element based projection of the time evolution of the PSZS, suited for global particle-in-cell (PIC) gyrokinetic (GK) codes. The resulting algorithm has been implemented in the global GK PIC code ORB5. PSZSs can not only be used for validating reduced models, but also as a diagnostic tool for characterizing the nonlinear interaction in phase space between Alfvén instabilities and EPs in global GK simulations.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Vannini, Francesco; Biancalani, Alessandro; Bottino, Alberto; Hayward-Schneider, Thomas; Lauber, Philipp; Mishchenko, Alexey; Poli, Emanuele; Rettino, B; Vlad, Gregorio; Wang, Xin; Team, ASPEX Upgrade
Gyrokinetic modelling of the Alfvén mode and EGAM activity in ASDEX Upgrade Journal Article
In: Journal of Physics: Conference Series, vol. 2397, pp. 012003, 2022.
@article{vannini_2300,
title = {Gyrokinetic modelling of the Alfvén mode and EGAM activity in ASDEX Upgrade},
author = {Francesco Vannini and Alessandro Biancalani and Alberto Bottino and Thomas Hayward-Schneider and Philipp Lauber and Alexey Mishchenko and Emanuele Poli and B Rettino and Gregorio Vlad and Xin Wang and ASPEX Upgrade Team},
url = {https://dx.doi.org/10.1088/1742-6596/2397/1/012003},
year = {2022},
date = {2022-12-01},
journal = {Journal of Physics: Conference Series},
volume = {2397},
pages = {012003},
abstract = {Energetic particles present in tokamak machines can drive through resonant wave-particle interaction different plasma instabilities, e.g Alfvén modes and energetic particle-driven geodesic acoustic modes (EGAMs). While the former are potentially detrimental as they can enhance the energetic particle transport and damage the machine wall, the latter are axisymmetric, possibly benign modes that can act to regulate turbulence. A unique scenario, the so-called NLED-AUG case, has been developed in ASDEX Upgrade by tuning the plasma parameters so that the energetic particle kinetic energy is 100 times higher than that of the background plasma, like in ITER. An intense energetic particle-driven activity is observed, most prominently various Alfvén mode bursts triggering chirping EGAMs. The present work reports studies on the Alfvén mode and EGAM dynamics showing, for the first time, many toroidal mode gyrokinetic simulations with ORB5 where the NLED-AUG case scenario is considered. We study the mode dynamics modelling the energetic particles with different equilibrium distribution functions, such as: isotropic slowing-down, double-bump-on-tail and equivalent Maxwellian. We retain, at the beginning, the nonlinearities only in the energetic particle dynamics. Later, also the background plasma species nonlinearities are taken into account.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Ouassil, Salah-Eddine; Magri, Anouar El; Vanaei, Hamidreza; Vaudreuil, Sébastien
In: Journal Of Applied Polymer Science, vol. 140, no. 4, pp. e53353, 2022.
@article{ouassil_2046,
title = {Investigating the effect of printing conditions and annealing on the porosity and tensile behavior of 3D-printed polyetherimide material in Z-direction},
author = {Salah-Eddine Ouassil and Anouar El Magri and Hamidreza Vanaei and Sébastien Vaudreuil},
url = {https://doi.org/10.1002/app.53353},
year = {2022},
date = {2022-11-01},
journal = {Journal Of Applied Polymer Science},
volume = {140},
number = {4},
pages = {e53353},
abstract = {Fused filament fabrication process presents drawbacks in mechanical properties observed when printing in the build direction (Z-direction). Such anisotropic properties will affect the part's performances and have to be minimized during fabrication. This study aims to evaluate the effects of nozzle temperature, printing speed and specimen state (annealed or as-printed) on porosity percentage and tensile properties for 3D printed polyetherimide (PEI) (ULTEM 1010) parts in Z-direction. The results demonstrated that print speed is the most influential process parameter that should be adjusted in consideration with the other printing parameters. The specimens' state did not reveal a noticeable influence, as the amorphous nature of PEI is considered less receptive to annealing. The optimization method to achieve the best results yielded values of 360 °C and 30 mm/s as printing conditions, followed by heat treatment. This was confirmed by porosity measurements, tensile testing, and scanning electron microscopy observations. The best performances of PEI material were 3425.5 MPa, 102 MPa, and 4.30% for Young's modulus, tensile strength, and elongation at break, respectively.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kanhonou, Michèle
Les ingénieurs à la conquête du secteur de la santé Miscellaneous
L'Usine Nouvelle, 2022.
@misc{kanhonou_2250,
title = {Les ingénieurs à la conquête du secteur de la santé},
author = {Michèle Kanhonou},
url = {https://www.usinenouvelle.com/editorial/ces-ingenieurs-qui-prennent-soin-de-nous.N2065592},
year = {2022},
date = {2022-11-01},
howpublished = {L'Usine Nouvelle},
keywords = {},
pubstate = {online},
tppubtype = {misc}
}
Venkateswaran, Swaminath
Un robot bio-inspiré pour l'inspection des canalisations Conference
Biomim'expo 2022, Paris, France, 2022.
@conference{venkateswaran_2279,
title = {Un robot bio-inspiré pour l'inspection des canalisations},
author = {Swaminath Venkateswaran},
url = {https://www.youtube.com/watch?v=vRXUEnpLvsk&t=776s},
year = {2022},
date = {2022-11-01},
booktitle = {Biomim'expo 2022},
address = {Paris, France},
abstract = {Les robots d'inspection de canalisations jouent un rôle important dans des industries telles que le nucléaire, la chimie et les eaux usées. Ils peuvent opérer avec précision dans un environnement irradié ou pollué, réduisant ainsi les risques pour les humains. Ce travail commence par l'étude du cas d'un robot d'inspection bio-inspiré rigide qui a été développé au LS2N, France pour AREVA. Des modèles statiques et dynamiques sont développés pour comprendre les forces de serrage et les couples des actionneurs du robot. Des validations expérimentales sont également effectuées sur le prototype pour interpréter les forces d'actionnement en temps réel. Pour améliorer sa mobilité, l'architecture du robot est rendue flexible par l'ajout d'un mécanisme de tenségrité. Deux types de mécanismes de tenségrité sont proposés et analysés avec des méthodes algébriques pour comprendre leurs limites d'inclinaison et pour connaître l'influence des paramètres de conception. Des expériences sont réalisées sur l'un des prototypes des mécanismes de tenségrité développés au LS2N avec deux types de trajectoire en positions horizontale et verticale. Ensuite, une optimisation est réalisée pour identifier les moteurs qui peuvent permettre du robot d'inspection de canalisation flexible de passer les coudes et les jonctions pour une plage donnée de diamètres de tuyaux. Une maquette numérique du robot flexible est réalisée dans un logiciel de CAO.},
keywords = {},
pubstate = {online},
tppubtype = {conference}
}
Salvarani, Francesco
Exponential convergence to consensus in finite and infinite dimensions Conference
Japan-France Joint Workshop ?Interacting Particle Systems and Fluid Mechanics : Theory and Applications?, Institut Français du Japon-Kansai, Kyoto, Japan, 2022.
@conference{salvarani_2288,
title = {Exponential convergence to consensus in finite and infinite dimensions},
author = {Francesco Salvarani},
url = {https://stakata.wordpress.com/category/workshops-conferences/},
year = {2022},
date = {2022-11-01},
booktitle = {Japan-France Joint Workshop ?Interacting Particle Systems and Fluid Mechanics : Theory and Applications?},
address = {Institut Français du Japon-Kansai, Kyoto, Japan},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Vannini, Francesco; Biancalani, Alessandro; Bottino, Alberto; Hayward-Schneider, Thomas; Lauber, Philipp; Mishchenko, Alexey; Poli, Emanuele; Rettino, B; Vlad, Gregorio; Wang, Xin; Team, ASPEX Upgrade
Gyrokinetic modelling of the Alfvén mode activity in ASDEX Upgrade with an isotropic slowing-down fast-particle distribution Journal Article
In: Nuclear Fusion, vol. 62, no. 12, pp. 126042, 2022.
@article{vannini_2299,
title = {Gyrokinetic modelling of the Alfvén mode activity in ASDEX Upgrade with an isotropic slowing-down fast-particle distribution},
author = {Francesco Vannini and Alessandro Biancalani and Alberto Bottino and Thomas Hayward-Schneider and Philipp Lauber and Alexey Mishchenko and Emanuele Poli and B Rettino and Gregorio Vlad and Xin Wang and ASPEX Upgrade Team},
url = {https://dx.doi.org/10.1088/1741-4326/ac8b1e},
year = {2022},
date = {2022-11-01},
journal = {Nuclear Fusion},
volume = {62},
number = {12},
pages = {126042},
abstract = {In the present paper, the evolution of the Alfvén modes (AMs) is studied in a realistic ASDEX Upgrade equilibrium by analyzing the results of simulations with the global, electromagnetic, gyrokinetic particle-in-cell code ORB5. The energetic particles (EPs) are modelled both via the newly implemented isotropic slowing-down and with Maxwellian distribution functions. The comparison of the numerical results shows that modelling the EPs with the equivalent Maxwellian rather than with the slowing-down, does not significantly affect the frequency of the driven AM, while its growth rate appears to be underestimated with a quantitative difference as large as almost 30%. Additionally the choice of the isotropic slowing-down allows a better description of the nonlinear modification of the dominant AM frequency, while an equivalent Maxwellian underestimates it. A good comparison with the experimental spectrogram is found.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Venkateswaran, Swaminath; Chablat, Damien Charles
Stability analysis of tensegrity mechanism coupled with a bio- inspired piping inspection robot Conference
47ème congrès de la Société de Biomécanique, Monastir, Tunisie, 2022.
@conference{venkateswaran_1843,
title = {Stability analysis of tensegrity mechanism coupled with a bio- inspired piping inspection robot},
author = {Swaminath Venkateswaran and Damien Charles Chablat},
url = {https://arxiv.org/ftp/arxiv/papers/2206/2206.01433.pdf},
year = {2022},
date = {2022-10-01},
booktitle = {47ème congrès de la Société de Biomécanique},
address = {Monastir, Tunisie},
abstract = {Piping inspection robots play an essential role for industries as they can reduce human effort and pose a lesser risk to their lives. Generally, the locomotion techniques of these robots can be classified into mechanical and bioinspired. By using slot-follower leg mechanisms, DC-motors, and control units, a rigid caterpillar type inspection robot was designed and developed at LS2N, France. This rigid prototype helped in identifying the static forces required to
accomplish good contact forces with the pipeline walls. In order to work inside curvatures, a tensegrity mechanism that uses three tension springs and a passive universal joint was introduced between each module of this robot. The optimal parameters of the robot assembly were identified by considering a preload of the cables, which ensured the stability of the entire robot. However, under static conditions, there exist some forces on the robot,
especially on the tensegrity mechanism when one end of the leg mechanism is clamped with the pipeline walls. These forces are dominant when the orientation of the pipeline is horizontal. The objective of this article is to understand the effect of the stiffness of
the spring on the static stability of the tensegrity mechanism under the self-weight of the robot assembly.},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Venkateswaran, Swaminath; Chablat, Damien Charles
Stability analysis of tensegrity mechanism coupled with a bio- inspired piping inspection robot Proceedings Article
In: 47th Congress of the society of Biomechanics, Monastir, Tunisia, Monastir, Tunisia, 2022, ISBN: 1025-5842.
@inproceedings{venkateswaran_1843,
title = {Stability analysis of tensegrity mechanism coupled with a bio- inspired piping inspection robot},
author = {Swaminath Venkateswaran and Damien Charles Chablat},
url = {https://www.tandfonline.com/doi/epdf/10.1080/10255842.2022.2116885?needAccess=true&role=button},
issn = {1025-5842},
year = {2022},
date = {2022-10-01},
booktitle = {47th Congress of the society of Biomechanics, Monastir, Tunisia},
address = {Monastir, Tunisia},
abstract = {Piping inspection robots play an essential role for industries as they can reduce human effort and pose a lesser risk to their lives. Generally, the locomotion techniques of these robots can be classified into mechanical and bioinspired. By using slot-follower leg mechanisms, DC-motors, and control units, a rigid caterpillar type inspection robot was designed and developed at LS2N, France. This rigid prototype helped in identifying the static forces required to
accomplish good contact forces with the pipeline walls. In order to work inside curvatures, a tensegrity mechanism that uses three tension springs and a passive universal joint was introduced between each module of this robot. The optimal parameters of the robot assembly were identified by considering a preload of the cables, which ensured the stability of the entire robot. However, under static conditions, there exist some forces on the robot,
especially on the tensegrity mechanism when one end of the leg mechanism is clamped with the pipeline walls. These forces are dominant when the orientation of the pipeline is horizontal. The objective of this article is to understand the effect of the stiffness of
the spring on the static stability of the tensegrity mechanism under the self-weight of the robot assembly.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Benmesbah, Fatima; Clain, Pascal; Fandino, Olivia; Osswald, Véronique; Fournaison, Laurence; Dicharry, Christophe; Delahaye, Anthony
Calorimetric study of carbon dioxide (CO2) hydrate formation and dissociation processes in porous media Journal Article
In: Chemical Engineering Science, vol. 264, pp. 118108, 2022.
@article{benmesbah_1960,
title = {Calorimetric study of carbon dioxide (CO2) hydrate formation and dissociation processes in porous media},
author = {Fatima Benmesbah and Pascal Clain and Olivia Fandino and Véronique Osswald and Laurence Fournaison and Christophe Dicharry and Anthony Delahaye},
url = {https://www.sciencedirect.com/science/article/pii/S0009250922006923},
year = {2022},
date = {2022-10-01},
journal = {Chemical Engineering Science},
volume = {264},
pages = {118108},
abstract = {Understanding the formation and dissociation mechanisms of gas hydrate in porous media is important for the development of new energy-efficient and environmentally friendly technologies related to cold storage as they provide significant latent heat and energy density at suitable phase change temperature. The challenge is to understand the interactions between gas hydrates and the chosen storage media in order to assess the operating conditions likely to optimize time and energy consumption in cold production and storage systems. In this work, CO2 hydrates formation and dissociation are investigated in two morphologically different porous materials: sand and silica gels. A calorimetric approach is applied to study both the CO2 hydrate formation kinetics, particularly the induction time, and the amount of hydrate formed for each of the two porous materials. The experiments are performed using a differential thermal analysis device with two identical measuring cells. The present work is focused on assessing the effect of key factors like water saturation, particle size and the morphology of porous media on CO2 hydrate formation and dissociation processes. Overall, the results do not show a statistically significant correlation between these factors and the induction time. Interestingly, the results obtained with dual porous silica gel showed a higher amount of hydrate formed compared to those with sand for similar initial pressure, temperature and water content conditions. This result may be due to the fact that silica gels provide higher surface area due to their smaller particle size (20-45 µm vs 80-450 µm for sand), and the presence of internal pore volume in silica gel particles.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Vanaei, Hamidreza; Khelladi, Sofiane; Tcharkhtchi, Abbas
Roadmap: Numerical-Experimental Investigation and Optimization of 3D-Printed Parts Using Response Surface Methodology Journal Article
In: Materials, vol. 15, no. 20, pp. 7193, 2022.
@article{vanaei_1962,
title = {Roadmap: Numerical-Experimental Investigation and Optimization of 3D-Printed Parts Using Response Surface Methodology},
author = {Hamidreza Vanaei and Sofiane Khelladi and Abbas Tcharkhtchi},
url = {https://www.mdpi.com/1996-1944/15/20/7193},
year = {2022},
date = {2022-10-01},
journal = {Materials},
volume = {15},
number = {20},
pages = {7193},
abstract = {Several process variables can be taken into account to optimize the fused filament fabrication (FFF) process, a promising additive manufacturing technique. To take into account the most important variables, a numerical-experimental roadmap toward the optimization of the FFF process, by taking into account some physico-chemical and mechanical characteristics, has been proposed to implement the findings through the thermal behavior of materials. A response surface methodology (RSM) was used to consider the effect of liquefier temperature, platform temperature, and print speed. RSM gave a confidence domain with a high degree of crystallinity, Young's modulus, maximum tensile stress, and elongation at break. Applying the corresponding data from the extracted zone of optimization to the previously developed code showed that the interaction of parameters plays a vital role in the rheological characteristics, such as temperature profile of filaments during deposition. Favorable adhesion could be achieved through the deposited layers in the FFF process. The obtained findings nurture motivations for working on the challenges and bring us one step closer to the optimization objectives in the FFF process to solve the industrial challenges.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Venkateswaran, Swaminath; Chablat, Damien Charles
Stability analysis of tensegrity mechanism coupled with a bio-inspired piping inspection robot Journal Article
In: Computer Methods In Biomechanics And Biomedical Engineering, vol. 25, no. 1, pp. 300-302, 2022.
@article{venkateswaran_2384,
title = {Stability analysis of tensegrity mechanism coupled with a bio-inspired piping inspection robot},
author = {Swaminath Venkateswaran and Damien Charles Chablat},
url = {https://www.tandfonline.com/doi/abs/10.1080/10255842.2022.2116885},
year = {2022},
date = {2022-10-01},
journal = {Computer Methods In Biomechanics And Biomedical Engineering},
volume = {25},
number = {1},
pages = {300-302},
abstract = {Piping inspection robots play an essential role for industries as they can reduce the human effort and pose lesser risker to their lives. Generally, the locomotion techniques of these robots can be classified into mechanical and bioinspired. By using slot-follower leg mechanisms, DC-motors and control units, a rigid caterpillar type inspection robot was designed and developed at LS2N, France. This rigid prototype helped in identifying the static forces required to accomplish good contact forces with the pipeline walls. In order to work inside curvatures, a tensegrity mechanism that uses three tension springs and a passive universal joint was introduced between each module of this robot. The optimal parameters of the robot assembly were identified by considering a preloading along the cables, which ensured the stability of the entire robot. However, under static conditions, there exists some forces on the robot,especially on the tensegrity mechanism when one end of the leg mechanisms is clamped with the pipeline walls. These forces are dominant when the orientation of the pipeline is horizontal. The objective of this article is to understand the effect of stiffness of thespring on the static stability of the tensegrity mechanism under the self-weight of the robot assembly.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Magri, Anouar El; Vanaei, Hamidreza; Bencaid, Salah Eddine; Vaudreuil, Sébastien
Effects of Laser Power and Hatch Orientation on Final Properties of PA12 Parts Produced by Selective Laser Sintering Journal Article
In: Polymers, vol. 14, no. 17, pp. 3674, 2022.
@article{el_magri_1958,
title = {Effects of Laser Power and Hatch Orientation on Final Properties of PA12 Parts Produced by Selective Laser Sintering},
author = {Anouar El Magri and Hamidreza Vanaei and Salah Eddine Bencaid and Sébastien Vaudreuil},
url = {https://doi.org/10.3390/polym14173674},
year = {2022},
date = {2022-09-01},
journal = {Polymers},
volume = {14},
number = {17},
pages = {3674},
abstract = {Poly(dodecano-12-lactam) (commercially known as polyamide ?PA12?) is one of the most resourceful materials used in the selective laser sintering (SLS) process due to its chemical and physical properties. The present work examined the influence of two SLS parameters, namely, laser power and hatch orientation, on the tensile, structural, thermal, and morphological properties of the fabricated PA12 parts. The main objective was to evaluate the suitable laser power and hatching orientation with respect to obtaining better final properties. PA12 powders and SLS-printed parts were assessed through their particle size distributions, X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), a scanning electron microscope (SEM), and their tensile properties. The results showed that the significant impact of the laser power while hatching is almost unnoticeable when using a high laser power. A more significant condition of the mechanical properties is the uniformity of the powder bed temperature. Optimum factor levels were achieved at 95% laser power and parallel/perpendicular hatching. Parts produced with the optimized SLS parameters were then subjected to an annealing treatment to induce a relaxation of the residual stress and to enhance the crystallinity. The results showed that annealing the SLS parts at 170 °C for 6 h significantly improved the thermal, structural, and tensile properties of 3D-printed PA12 parts.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Magri, Anouar El; Bencaid, Salah Eddine; Vanaei, Hamidreza; Vaudreuil, Sébastien
Effects of Laser Power and Hatch Orientation on Final Properties of PA12 Parts Produced by Selective Laser Sintering Journal Article
In: Polymers, vol. 14, no. 17, pp. 3674, 2022.
@article{el_magri_1892,
title = {Effects of Laser Power and Hatch Orientation on Final Properties of PA12 Parts Produced by Selective Laser Sintering},
author = {Anouar El Magri and Salah Eddine Bencaid and Hamidreza Vanaei and Sébastien Vaudreuil},
url = {https://www.mdpi.com/2073-4360/14/17/3674},
year = {2022},
date = {2022-09-01},
journal = {Polymers},
volume = {14},
number = {17},
pages = {3674},
abstract = {Poly(dodecano-12-lactam) (commercially known as polyamide ?PA12?) is one of the most resourceful materials used in the selective laser sintering (SLS) process due to its chemical and physical properties. The present work examined the influence of two SLS parameters, namely, laser power and hatch orientation, on the tensile, structural, thermal, and morphological properties of the fabricated PA12 parts. The main objective was to evaluate the suitable laser power and hatching orientation with respect to obtaining better final properties. PA12 powders and SLS-printed parts were assessed through their particle size distributions, X-ray diffraction (XRD), Fourier Transform Infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), a scanning electron microscope (SEM), and their tensile properties. The results showed that the significant impact of the laser power while hatching is almost unnoticeable when using a high laser power. A more significant condition of the mechanical properties is the uniformity of the powder bed temperature. Optimum factor levels were achieved at 95% laser power and parallel/perpendicular hatching. Parts produced with the optimized SLS parameters were then subjected to an annealing treatment to induce a relaxation of the residual stress and to enhance the crystallinity. The results showed that annealing the SLS parts at 170 °C for 6 h significantly improved the thermal, structural, and tensile properties of 3D-printed PA12 parts},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Boudin, Laurent; Rossi, Alex; Salvarani, Francesco
A kinetic model of polyatomic gas with resonant collisions Journal Article
In: Ricerche Di Matematica, 2022.
@article{boudin_1894,
title = {A kinetic model of polyatomic gas with resonant collisions},
author = {Laurent Boudin and Alex Rossi and Francesco Salvarani},
url = {https://doi.org/10.1007/s11587-022-00733-1},
year = {2022},
date = {2022-09-01},
journal = {Ricerche Di Matematica},
keywords = {},
pubstate = {online},
tppubtype = {article}
}
Taleb, Ihab; Guérard, Guillaume; Fauberteau, Frédéric; Nguyen, Nga
A Holonic Smart Grid Model for Isolated Areas Conference
European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases, PhD Forum, Grenoble, France, 2022.
@conference{taleb_1934,
title = {A Holonic Smart Grid Model for Isolated Areas},
author = {Ihab Taleb and Guillaume Guérard and Frédéric Fauberteau and Nga Nguyen},
url = {https://2022.ecmlpkdd.org/index.php/phd-forum/},
year = {2022},
date = {2022-09-01},
booktitle = {European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in Databases, PhD Forum},
address = {Grenoble, France},
abstract = {Since the beginning of the $21$st century, smart grid models are gaining more and more importance as they play a major role in the demand side management and the flexible integration of renewable energy sources. Indeed, diverse architectures and models have been proposed for smart grids. In this paper, we propose a model composed of two parts, the first part is to optimize, on a weekly scale, thermal generation, and energy storage while prioritizing renewable energy sources to minimize global costs and global warming effects. The second part consists of, having optimized production and storage, the negotiation between neighboring holons on the same level using evolutionary game theory, combined with simulated annealing and Q-learning approaches to ensure a back and forth between the various levels.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Mishchenko, Alexey; Bottino, Alberto; Hayward-Schneider, Thomas; Poli, Emanuele; Wang, Xin; Nührenberg, C; Biancalani, Alessandro; Lanti, E; Lauber, Philipp; Hatzky, R; Vannini, Francesco; Villard, Laurent; Widmer, F; Keiber, R
Gyrokinetic particle-in-cell simulations of electromagnetic turbulence in the presence of fast particles and global modes Journal Article
In: Plasma Physics And Controlled Fusion, vol. 64, no. 10, pp. 104009, 2022.
@article{mishchenko_2296,
title = {Gyrokinetic particle-in-cell simulations of electromagnetic turbulence in the presence of fast particles and global modes},
author = {Alexey Mishchenko and Alberto Bottino and Thomas Hayward-Schneider and Emanuele Poli and Xin Wang and C Nührenberg and Alessandro Biancalani and E Lanti and Philipp Lauber and R Hatzky and Francesco Vannini and Laurent Villard and F Widmer and R Keiber},
url = {https://dx.doi.org/10.1088/1361-6587/ac8dbc},
year = {2022},
date = {2022-09-01},
journal = {Plasma Physics And Controlled Fusion},
volume = {64},
number = {10},
pages = {104009},
abstract = {Global simulations of electromagnetic turbulence in circular-flux-surface tokamak and ASDEX-Upgrade geometry, tearing instabilities and their combination with the electromagnetic turbulence, nonlinear Alfvénic modes in the presence of fast particles and their combination with the electromagnetic turbulence and global electromagnetic turbulence in Wendelstein 7-X stellarator geometry are carried out using the gyrokinetic particle-in-cell code ORB5 (Lanti et al 2020 Comp. Phys. Comm. 251 107072) and EUTERPE (Kornilov et al 2004 Phys. Plasmas 11 3196). Computational feasibility of simulating such complex coupled systems is demonstrated. For simplicity, the reduced mass ratio is used throughout the paper.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Guerich, Mohamed; Assaf, Samir
Damping optimal design of sandwich beams partially covered with damping patches Proceedings Article
In: Proceedings of ISMA2022 including USD2022, Leuven, belgium, 2022, ISBN: 978-90-828931-5-1.
@inproceedings{guerich_2372,
title = {Damping optimal design of sandwich beams partially covered with damping patches},
author = {Mohamed Guerich and Samir Assaf},
url = {https://www.isma-isaac.be/isma2022},
issn = {978-90-828931-5-1},
year = {2022},
date = {2022-09-01},
booktitle = {Proceedings of ISMA2022 including USD2022},
address = {Leuven, belgium},
abstract = {The application of viscoelastic materials in the form of constrained layers in mechanical structures is an
efficient and cost-effective technique for solving noise and vibration problems. This technique requires
design tool to select the best location, type and thickness of the damping treatment. This paper presents a
finite element model for the vibration of beams partially or fully covered with a constrained viscoelastic
damping material. The model is based on Bernoulli-Euler theory for the faces and Timoshenko beam theory
for the core. The sandwich beam finite element is compatible with the conventional C1 finite element for
homogenous beams. To validate the proposed model, several free vibration analyses of fully or partially
covered beams, with different locations of the damping patches and different percent coverage are studied.
The results show that the proposed approach can be used as an effective tool to study the influence of the
location and treatment size on the natural frequencies and the associated modal loss factors.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Salhi, Loubna; Seaid, Mohammed; Yakoubi, Driss
Well-posedness and numerical approximation of steady convection-diffusion-reaction problems in porous media Journal Article
In: Computers & Mathematics With Applications, vol. 124, pp. 129-148, 2022.
@article{salhi_1885,
title = {Well-posedness and numerical approximation of steady convection-diffusion-reaction problems in porous media},
author = {Loubna Salhi and Mohammed Seaid and Driss Yakoubi},
url = {https://www.sciencedirect.com/science/article/abs/pii/S0898122122003443},
year = {2022},
date = {2022-08-01},
journal = {Computers & Mathematics With Applications},
volume = {124},
pages = {129-148},
abstract = {We study a class of steady nonlinear convection-diffusion-reaction problems in porous media. The governing equations consist of coupling the Darcy equations for the pressure and velocity fields to two equations for the heat and mass transfer. The viscosity and diffusion coefficients are assumed to be nonlinear depending on the temperature and concentration of the medium. Well-posedness of the coupled problem is analyzed and existence along with uniqueness of the weak solution is investigatedbased on a fixed-point method. An iterative scheme for solving the associated fixed-point problem is proposed and its convergence is studied. Numerical experiments are presented for two examples of coupled convection-diffusion-reaction problems. Applications to radiative heat transfer and propagation of thermal fronts in porous media are also included in this study. The obtained results show good numerical convergence and validate the established theoretical estimates.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
El-Amrani, Mofdi; Salhi, Loubna; Seaid, Mohammed; Yakoubi, Driss
An iterative scheme for solving acoupled Darcy-convection-diffusion model Journal Article
In: Journal Of Mathematical Analysis And Applications, vol. 517, no. 2, pp. 126603, 2022.
@article{el-amrani_1887,
title = {An iterative scheme for solving acoupled Darcy-convection-diffusion model},
author = {Mofdi El-Amrani and Loubna Salhi and Mohammed Seaid and Driss Yakoubi},
url = {https://www.sciencedirect.com/science/article/pii/S0022247X22006175},
year = {2022},
date = {2022-08-01},
journal = {Journal Of Mathematical Analysis And Applications},
volume = {517},
number = {2},
pages = {126603},
abstract = {We present an iterative scheme for the numerical analysis of a class of coupled Darcy-convection-diffusion problems modelling flow and heat transfer in porous media. The governing equations consist of the Darcy equations for the flow coupled to a convection-diffusion equation for heat transfer with nonlinear viscosity and diffusion coefficient depending on the temperature. Existence and uniqueness of the weak solution for the considered problem are first analyzed using a fixed-point method and then convergence study of two iterative schemes for the fixed-point algorithm is presented. Two numerical examples are selected to validate the theoretical estimates and to demonstrate the performance of the proposed algorithm. The obtained results support our theoretical expectations for a good numerical convergence with the developed estimates.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Amirat, Youcef; Hamdache, Kamel; Shelukhin, Vladimir V.
Homogenization of MHD flows in porous media Journal Article
In: Journal Of Differential Equations, vol. 339, no. 339, pp. 90-133, 2022.
@article{amirat_1963,
title = {Homogenization of MHD flows in porous media},
author = {Youcef Amirat and Kamel Hamdache and Vladimir V. Shelukhin},
url = {https://doi.org/10.1016/j.jde.2022.08.014},
year = {2022},
date = {2022-08-01},
journal = {Journal Of Differential Equations},
volume = {339},
number = {339},
pages = {90-133},
abstract = {The paper is concerned with the homogenization of a nonlinear differential system describing the flow of an electrically conducting, incompressible and viscous Newtonian fluid through a periodic porous medium, in the presence of a magnetic field. We introduce a variational formulation of the differential system equipped with boundary conditions. We show the existence of a solution of the variational problem, and derive uniform estimates of the solutions depending on the characteristic parameters of the flow. Using the two-scale convergence method, we rigorously derive a two-scale equation for the two-scale current density, and a two-pressure Stokes system. We derive, in the case of constant magnetic permeability, an explicit relation expressing the macroscopic velocity as a function of the macroscopic Lorentz force, the pressure gradient, the external body force, and the macroscopic current density, via two permeability filtration ten- sors. When the magnetic field is absent, this relation reduces to the Darcy law.
© 2022 Elsevier Inc. All rights reserved.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Joseph, Fitoussi; Nikooharf, Mohammad Hossein; Kallel, Achraf; Shirinbayani, Mohammadali
In: Applied Composite Materials, vol. 29, no. 3, pp. 1-21, 2022.
@article{joseph_1864,
title = {Mechanical Properties and Damage Behavior of Polypropylene Composite (GF50-PP) Plate Fabricated by Thermocompression Process Under High Strain Rate Loading at Room and Cryogenic Temperatures},
author = {Fitoussi Joseph and Mohammad Hossein Nikooharf and Achraf Kallel and Mohammadali Shirinbayani},
url = {https://link.springer.com/article/10.1007/s10443-022-10047-y},
year = {2022},
date = {2022-07-01},
journal = {Applied Composite Materials},
volume = {29},
number = {3},
pages = {1-21},
abstract = {This paper concerns the coupling effect of strain rate and temperature on the damage mechanical properties of the long-glass-fiber-reinforced polypropylene (GF50-PP) composite produced by the thermocompression process. Composite plates of GF50-PP have been employed to study the effect of glass fiber distribution on the mechanical properties of the composites. To achieve this objective the tensile tests have been performed at strain rate range from quasi-static to 100 s?1 at two loading temperatures of 20 °C and -70 °C, while measuring the local deformation through a contactless technique using a high-speed camera. High strain rate tensile tests findings showed that GF50-PP behavior is strongly strain-rate dependent. For instance, the stress damage threshold for three fiber orientations of 0°, 45°, and 90° to the Mold Flow Direction (MFD) was increased, when the strain rate varies from quasi-static (0.001 s?1) to 100 s?1 at two loading temperatures of 20 °C and -70 °C. The experimental methodology was coupled to microscopic observations using SEM to study the damage mechanisms of GF50-PP. The analysis confirms that there are three damage mechanisms: fiber-matrix interface debonding, matrix breakage, and pseudo-delamination between neighboring bundles of fibers.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Guérard, Guillaume; Bichet, Lucas; Amor, Sofiane Ben
Survey on Javascript Engines Fuzzers Proceedings Article
In: Springer, (Ed.): The 6th International Symposium on Cyber Security, Cryptology and Machine Learning, Springer, Virtual Event, 2022.
@inproceedings{guerard_1861,
title = {Survey on Javascript Engines Fuzzers},
author = {Guillaume Guérard and Lucas Bichet and Sofiane Ben Amor},
editor = {Springer},
url = {https://link.springer.com/book/10.1007/978-3-031-07689-3},
year = {2022},
date = {2022-07-01},
booktitle = {The 6th International Symposium on Cyber Security, Cryptology and Machine Learning},
publisher = {Springer},
address = {Virtual Event},
abstract = {The security of Web users is becoming a major issue today. Thus, Web browsers and more particularly the JavaScript engines that compose them are studied carefully to detect and promptly correct the vulnerabilities that they embed. This article presents the current state of research on vulnerabilities affecting JavaScript engines, starting from the current research context to the research tools used.},
keywords = {},
pubstate = {online},
tppubtype = {inproceedings}
}
Fitoussi, Joseph; Nikooharf, Mohammad Hossein; Kallel, Achraf; Shirinbayani, Mohammadali
In: Applied Composite Materials, vol. 29, no. 3, pp. 1-21, 2022.
@article{fitoussi_1864,
title = {Mechanical Properties and Damage Behavior of Polypropylene Composite (GF50-PP) Plate Fabricated by Thermocompression Process Under High Strain Rate Loading at Room and Cryogenic Temperatures},
author = {Joseph Fitoussi and Mohammad Hossein Nikooharf and Achraf Kallel and Mohammadali Shirinbayani},
url = {https://link.springer.com/article/10.1007/s10443-022-10047-y},
year = {2022},
date = {2022-07-01},
journal = {Applied Composite Materials},
volume = {29},
number = {3},
pages = {1-21},
abstract = {This paper concerns the coupling effect of strain rate and temperature on the damage mechanical properties of the long-glass-fiber-reinforced polypropylene (GF50-PP) composite produced by the thermocompression process. Composite plates of GF50-PP have been employed to study the effect of glass fiber distribution on the mechanical properties of the composites. To achieve this objective the tensile tests have been performed at strain rate range from quasi-static to 100 s?1 at two loading temperatures of 20 °C and -70 °C, while measuring the local deformation through a contactless technique using a high-speed camera. High strain rate tensile tests findings showed that GF50-PP behavior is strongly strain-rate dependent. For instance, the stress damage threshold for three fiber orientations of 0°, 45°, and 90° to the Mold Flow Direction (MFD) was increased, when the strain rate varies from quasi-static (0.001 s?1) to 100 s?1 at two loading temperatures of 20 °C and -70 °C. The experimental methodology was coupled to microscopic observations using SEM to study the damage mechanisms of GF50-PP. The analysis confirms that there are three damage mechanisms: fiber-matrix interface debonding, matrix breakage, and pseudo-delamination between neighboring bundles of fibers.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Montiel, Antoine; Nguyen, Thuy; Rountree, Cindy; Geertsen, Valérie; Guenoun, Patrick; Bonamy, Daniel
Effect of architecture disorder on the elastic response of two-dimensional lattice materials Journal Article
In: Physical Review E, vol. 106, no. 1, pp. 015004, 2022.
@article{montiel_1922,
title = {Effect of architecture disorder on the elastic response of two-dimensional lattice materials},
author = {Antoine Montiel and Thuy Nguyen and Cindy Rountree and Valérie Geertsen and Patrick Guenoun and Daniel Bonamy},
url = {https://journals.aps.org/pre/abstract/10.1103/PhysRevE.106.015004?ft=1},
year = {2022},
date = {2022-07-01},
journal = {Physical Review E},
volume = {106},
number = {1},
pages = {015004},
abstract = {We examine how disordering joint position influences the linear elastic behavior of lattice materials via numerical simulations in two-dimensional beam networks. Three distinct initial crystalline geometries are selected as representative of mechanically isotropic materials with low connectivity, mechanically isotropic materials with high connectivity, and mechanically anisotropic materials with intermediate connectivity. Introducing disorder generates spatial fluctuations in the elasticity tensor at the local (joint) scale. Proper coarse-graining reveals a well-defined continuum-level scale elasticity tensor. Increasing disorder aids in making initially anisotropic materials more isotropic. The disorder impact on the material stiffness depends on the lattice connectivity: Increasing the disorder softens lattices with high connectivity and stiffens those with low connectivity, without modifying the scaling between elastic modulus and density (linear scaling for high connectivity and cubic scaling for low connectivity). Introducing disorder in lattices with intermediate fixed connectivity reveals both scaling: the linear scaling occurs for low density, the cubic one at high density, and the crossover density increases with disorder. Contrary to classical formulations, this work demonstrates that connectivity is not the sole parameter governing elastic modulus scaling. It offers a promising route to access novel mechanical properties in lattice materials via disordering the architectures.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Nguyen, Thuy; Bonamy, Daniel
Effect of atomic-scale solid discreetness in brittle fracture problem Conference
11th European Solid Mechanics Conference, Galway, Ireland, 2022.
@conference{nguyen_1923,
title = {Effect of atomic-scale solid discreetness in brittle fracture problem},
author = {Thuy Nguyen and Daniel Bonamy},
url = {https://www.esmc2022.org/},
year = {2022},
date = {2022-07-01},
booktitle = {11th European Solid Mechanics Conference},
address = {Galway, Ireland},
abstract = {Material's resistance-to-failure is quantified by two dependent material constants (one is proportional to the square of the other): fracture energy and fracture toughness. Predicting their values from the solid structure at the atomistic scale remains insolved, even in the simplest situation of an ideal brittle fracture. By examining numerically crack growth in electrical analogues of brittle crystals with modulated geometries, we shed a new light on this question. We find that the value of fracture energy cannot be deduced from Griffith's free surface energy, as is generally believed [1]. Rather, it finds its origin in the matching between the continuum-level scale displacement field of solid mechanics and the discrete nature of solids at the atomic scale. By making use of the generic asymptotic form, referred to as Williams's series expansion [2], taken by the displacement field near the crack tip, we find an analytical solution for this matching, and subsequently a way to predict quantitativly fracture toughness from the atomistic parameters [3]. We will discuss how to extend the analysis to genuine elastic (plane stress) crack problems and predict fracture toughness in 2D and 3D materials. This work sheds new perspectives on how resistance-to-faillure is selected; and hence, how it can be improved. As such, it may catalyze novel research toward new architectured materials of superior strcutural performance via microstructure patterning : tougher, more durable, lighter and/or combining other functionalities.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Levy, Loup-Noé; Bosom, Jérémie; Guérard, Guillaume; Amor, Sofiane Ben; Bui, Marc; Tran, Hai
DevOps Model Appproach for Monitoring Smart Energy Systems Journal Article
In: Energies, vol. 15, no. 15, pp. 5516, 2022.
@article{levy_1924,
title = {DevOps Model Appproach for Monitoring Smart Energy Systems},
author = {Loup-Noé Levy and Jérémie Bosom and Guillaume Guérard and Sofiane Ben Amor and Marc Bui and Hai Tran},
url = {https://www.mdpi.com/1996-1073/15/15/5516},
year = {2022},
date = {2022-07-01},
journal = {Energies},
volume = {15},
number = {15},
pages = {5516},
abstract = {Energy systems are often socio-technical complex systems that are facing new challenges regarding technological and environmental changes. Because of their complex nature, they cannot be approached solely through analytical modeling, hence the inefficiency of most classical modeling approaches. In this article, a Hybrid Approach based on both systemic and analytical modeling is presented and applied to a case study. From this novel approach, a model?the Multi-Institution Building Energy System?is presented. It allowed us to highlight and detail the need for greater governance of energy systems. The socio-technical solutions identified to answer the issues of governance (Accuracy, Reliability and Fairness) were DevOps methodology and the use of Distributed Microservices Architecture. Based on this framework, the design of a Decision Support System assuring and exploiting state-of-the-art scalable tools for data management and machine learning factories is described in this article. Moreover, we wish to set up the conceptual basis necessary for the design of a generic theoretical framework of optimization applicable to complex socio-technical systems in the context of the management of a shared resource.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Himeur, Rania M.; Khelladi, Sofiane; Chikh, Mohamed Abdessamed Ait; Vanaei, Hamidreza; Belaidi, Idir; Bakir, Farid
Towards an Accurate Aerodynamic Performance Analysis Methodology of Cross-Flow Fans Journal Article
In: Energies, vol. 15, no. 14, pp. 5134, 2022.
@article{m._himeur_2099,
title = {Towards an Accurate Aerodynamic Performance Analysis Methodology of Cross-Flow Fans},
author = {Rania M. Himeur and Sofiane Khelladi and Mohamed Abdessamed Ait Chikh and Hamidreza Vanaei and Idir Belaidi and Farid Bakir},
url = {https://doi.org/10.3390/en15145134},
year = {2022},
date = {2022-07-01},
journal = {Energies},
volume = {15},
number = {14},
pages = {5134},
abstract = {Cross-flow fans (CFFs) have become increasingly popular in recent years. This is due to their use in several domains such as air conditioning and aircraft propulsion. They also show their utility in the ventilation system of hybrid electric cars. Their high efficiency and performance significantly rely on the design parameters. Up to now, there is no general approach that predicts the CFFs' performance. This work describes a new methodology that helps deduce the performance of CFFs in turbomachinery, using both analytical modeling and experimental data. Two different loss models are detailed and compared to determine the performance-pressure curves of this type of fan. The efficiency evaluation is achieved by realizing a multidisciplinary study, computational fluid dynamics (CFD) simulations, and an optimization algorithm combined to explore the internal flow field and obtain additional information about the eccentric vortex, to finally obtain the ultimate formulation of the Eck/Laing CFF efficiency, which is validated by the experimental results with good agreement. This approach can be an efficient tool to speed up the cross-flow fans' design cycle and to predict their global performance.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Biancalani, Alessandro; Bottino, Alberto; Falessi, Matteo Valerio; Hayward-Schneider, Thomas; Lauber, Philipp; Mishchenko, Alexey; Vannini, Francesco; Villard, Laurent; Zonca, Fulvio
Interaction of Alfvénic modes and turbulence via the nonlinear modification of the equilibrium profiles Proceedings Article
In: Interaction of Alfvénic modes and turbulence via the nonlinear modification of the equilibrium profiles, online, 2022, ISBN: 979-10-96389-16-2.
@inproceedings{biancalani_2217,
title = {Interaction of Alfvénic modes and turbulence via the nonlinear modification of the equilibrium profiles},
author = {Alessandro Biancalani and Alberto Bottino and Matteo Valerio Falessi and Thomas Hayward-Schneider and Philipp Lauber and Alexey Mishchenko and Francesco Vannini and Laurent Villard and Fulvio Zonca},
url = {http://ocs.ciemat.es/EPS2022PAP/html/author.html},
issn = {979-10-96389-16-2},
year = {2022},
date = {2022-07-01},
booktitle = {Interaction of Alfvénic modes and turbulence via the nonlinear modification of the equilibrium profiles},
address = {online},
abstract = {A key step towards the achievement of controlled nuclear fusion in magnetic confinement
devices is the mitigation of turbulence. Turbulent tokamak plasmas are intrinsically multiscale
systems. Microturbulence generates meso-scale zonal flows. Additionally, energetic particles
drive Alfvénic modes (AM) unstable, on meso- or macro-scales, and zonal structures.
In this work, we investigate the possible interaction of AMs and turbulence via the evolution
of the equilibrium profiles. Turbulence is known to strongly depend on the gradients of the
equilibrium profiles, for example plasma density and temperature. AMs can nonlinearly modify
the equilibrium profiles [1, 2, 3], and therefore affect turbulence. Viceversa, with the same
mechanism, turbulence can affect the AM dynamics.
We present results obtained by means of global gyrokinetic simulations with the particle-in-
cell code ORB5 [4]. In recent simulations with ORB5, AMs have been shown to carry substan-
tial heat and particle fluxes [5, 6]. Here, we extend that analysis by showing how the profile
modification due to those fluxes can affect turbulence.
References
[1] L. Chen and F. Zonca, Rev. Mod. Phys. 88, 015008 (2016)
[2] M. V. Falessi and F. Zonca, Phys. Plasmas 26, 022305 (2019)
[3] F. Zonca, L. Chen, M. V. Falessi and Z. Qiu, J. Phys. Conf. Ser. 1785, 012005 (2021)
[4] E. Lanti, et al, Comp. Phys. Commun. 251, 107072 (2020)
[5] A. Biancalani, A. Bottino, P. Lauber, A. Mishchenko and F. Vannini, J. Plasma Phys. 86, 825860301A (2020)
[6] A. Biancalani, et al, Plasma Phys. Control. Fusion 63, 065009 (2021)},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Guérard, Guillaume; Taleb, Ihab; Fauberteau, Frédéric; Nguyen, Nga
Modélisation Multi-Agent pour les Réseaux Energétique Insulaires Proceedings Article
In: Journées Francophones sur les Systèmes Multi-Agents, Saint-Etienne, France, 2022.
@inproceedings{guerard_1831,
title = {Modélisation Multi-Agent pour les Réseaux Energétique Insulaires},
author = {Guillaume Guérard and Ihab Taleb and Frédéric Fauberteau and Nga Nguyen},
url = {https://ci.mines-stetienne.fr/pfia2022/conferences/jfsma/},
year = {2022},
date = {2022-06-01},
booktitle = {Journées Francophones sur les Systèmes Multi-Agents},
address = {Saint-Etienne, France},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Chami, Nada; Clain, Pascal; Osswald, Véronique; Delahaye, Anthony; Fournaison, Laurence; Dalmazzone, Didier; Salehy, Yasmine
Rheological and thermal study of mixed CP + CO2 hydrates for refrigeration applications Proceedings Article
In: 1th European Conference on Gas Hydrates, Lyon, France, 2022.
@inproceedings{chami_1849,
title = {Rheological and thermal study of mixed CP + CO2 hydrates for refrigeration applications},
author = {Nada Chami and Pascal Clain and Véronique Osswald and Anthony Delahaye and Laurence Fournaison and Didier Dalmazzone and Yasmine Salehy},
url = {https://ecgh2022.sciencesconf.org/},
year = {2022},
date = {2022-06-01},
booktitle = {1th European Conference on Gas Hydrates},
address = {Lyon, France},
abstract = {The use of gas hydrates in secondary refrigeration can reduce cooling environmental impact by greenhouse gas reduction because of there high energy density. CO2 hydrates was selected at previous work as a candidate material for secondary refrigeration. In this study, cyclopentane, a thermodynamic promoter that has been identified for its promotive qualities to lower the formation pressure of CO2 hydrates was used to form mixed CP + CO2 hydrate slurries. This work deploys a temperature-controlled flowloop to characterize the rheological properties of hydrate slurries generated in situ from oil-in-water emulsions. Systems of 3 - 15wt% cyclopentane fraction to form pure CP hydrate and mixed CP + CO2 hydrate slurries were tested. The results showed that the viscosity of CP and mixed CP + CO2 hydrate slurries increase with the decrease of the shear rate, exhibiting a shear-thinning behavior. With a similar protocol, a rheological characterization involving a long period of hydrate slurries circulation was conducted. The results illustrated that the hydrate slurries behavior change with time. A thermal study was performed using heating tube method applied and heat transfer coefficients were determined for different cyclopentane fraction.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Osswald, Véronique; Clain, Pascal; Dalmazzone, Didier; Delahaye, Anthony; Fournaison, Laurence
Experimental heat transfer measurement applied to CO2 hydrate formation kinetic study Proceedings Article
In: 1th European Conference on Gas Hydrates, Lyon, France, 2022.
@inproceedings{osswald_1850,
title = {Experimental heat transfer measurement applied to CO2 hydrate formation kinetic study},
author = {Véronique Osswald and Pascal Clain and Didier Dalmazzone and Anthony Delahaye and Laurence Fournaison},
url = {https://ecgh2022.sciencesconf.org/},
year = {2022},
date = {2022-06-01},
booktitle = {1th European Conference on Gas Hydrates},
address = {Lyon, France},
abstract = {CO
2 hydrate slurry is a promising phase change material for secondary refrigeration cold distribution
issues, due to its high latent heat (about 500 kJ.kg 1 of water, higher than that of ice 333 kJ.kg 1) and
wide melting temperature range suitable for air c onditioning application. While the thermodynamic
properties of CO 2 hydrates are now well established, knowledge of crystallization kinetics phenomena
is still a challenge. Trying to understand and control the formation of gas hydrates is a key factor since
their discovery in pipeline plugs by Hammerschmidt, but unlike that case, the goal here is to promote
the rate of CO 2 hydrate formation. Most laboratory scale hydrate reactors are equipped with pressure
and temperature loggers, and mass balance on CO 2 all ows formation kinetic studies, but with
assumptions on CO 2 concentration in liquid phase in the liquid phase and the hydration number.
The
present work investigates the kinetics of CO 2 hydrate crystallization for different types of stirrers
and stirring sp eed conditions in a jacketed stirred batch reactor. Heat balance obtain experimentally
using a specially developed sensor installed on the cooling jacket. The mass fraction of crystallized
hydrate determine directly from the heat balance on the cooling jac ket. First, tests on water heating and
cooling steps and ice crystallization allowed the method validation before to apply it to CO 2 hydrate
crystallization. Experimental results described with an empirical model and compared to other mass
balance based ki netic determinations. Finally, the development of a simplified thermal model improved
this kinetic determination by estimating heat fl ows inside the reactor and with the environment.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Osswald, Véronique; Clain, Pascal; Dalmazzone, Didier; Fournaison, Laurence; Delahaye, Anthony
Suivi cinétique de la cristallisation des hydrates de CO2 par mesure thermique - Effet de l'agitation Proceedings Article
In: CRISTAL 10, Lyon, France, 2022.
@inproceedings{osswald_1851,
title = {Suivi cinétique de la cristallisation des hydrates de CO2 par mesure thermique - Effet de l'agitation},
author = {Véronique Osswald and Pascal Clain and Didier Dalmazzone and Laurence Fournaison and Anthony Delahaye},
url = {http://cristal10.univ-lyon1.fr/fr},
year = {2022},
date = {2022-06-01},
booktitle = {CRISTAL 10},
address = {Lyon, France},
abstract = {Les coulis d'hydrates de CO2 constituent un matériau à changement de phase prometteur pour la distribution du froid en réfrigération secondaire [1], en raison de leur chaleur latente élevée (environ 500 kJ.kg-1 d'eau, supérieure à celle de la glace: 333 kJ.kg-1) et de leur large plage de température de fusion adaptée aux applications de climatisation. Ce sont des structures cristallines proche de la glace, au sein desquelles sont enclathrées des molécules de dioxyde de carbone. Si les propriétés thermodynamiques des hydrates de CO2 sont désormais bien établies, la connaissance des phénomènes cinétiques de cristallisation reste parcellaire [2]. Comprendre et contrôler la formation des hydrates de gaz est un défi depuis leur découverte dans les bouchons de pipeline par Hammerschmidt [3]. Mais contrairement à ce cas, où l'on cherche à retarder l'apparition des hydrates, l'objectif ici est de favoriser leur cristallisation. La plupart des réacteurs dans lesquels est étudiée la cristallisation des hydrates à l'échelle du laboratoire sont équipés d'enregistreurs de pression et de température, et c'est à partir d'un bilan matière sur le CO2, en faisant des hypothèses sur la concentration de CO2 en phase liquide et le nombre d'hydratation, que le suivi de la cinétique est réalisé [4].
L'objet des travaux présentés ici est l'étude de la cinétique de cristallisation des hydrates de CO2 pour différents types d'agitateurs et différentes conditions de vitesse d'agitation dans un réacteur batch agité à double enveloppe. Le bilan thermique est obtenu expérimentalement en utilisant un capteur spécialement développé et installé sur la double enveloppe du réacteur. La fraction massique cristallisée est déterminée directement à partir du bilan thermique sur la double-enveloppe. Des essais sur les étapes de chauffage et de refroidissement de l'eau et la cristallisation de la glace ont permis de valider la méthode avant de l'appliquer à la cristallisation des hydrates de CO2. Les résultats expérimentaux sont décrits à partir d'un modèle empirique et comparés à d'autres déterminations cinétiques basées sur le bilan de matière. Enfin, le développement d'un modèle thermique simplifié du réacteur a permis d'améliorer cette détermination cinétique en estimant les flux de chaleur au sein du réacteur et avec l'environnement.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Bobbia, Benjamin
Théorème de Donsker pour des mesures empiriques locales sur des régions aléatoires Conference
53èmes journées de statistique de la SFDS, Lyon, France, 2022.
@conference{bobbia_1855,
title = {Théorème de Donsker pour des mesures empiriques locales sur des régions aléatoires},
author = {Benjamin Bobbia},
url = {https://jds22.sciencesconf.org/},
year = {2022},
date = {2022-06-01},
booktitle = {53èmes journées de statistique de la SFDS},
address = {Lyon, France},
abstract = {Nowadays, empirical processes are well known objects. A reason that push forward theirs studies is that, in many models, we can write the estimators as images of empirical measures. In this work we investigate the case of local empirical measures built over a sub-sample with data conditioned to be in a certain area. There exists numerous results about such question, but what can we say if the area of interest is data driven ? In the present work we present a general framework which allows to derive asymptotic results for this particular empirical measures (with "low" cost in terms of technicality and assumptions). This approach is mainly presented through the prism of extreme values theory. And we present an example illustrating how this empirical conditional measure assumption work well with optimal transport methods.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Salvarani, Francesco
Kinetic description of polyatomic gases undergoing resonant collisions Conference
Particle Systems and PDEs X, Braga, Portugal, 2022.
@conference{salvarani_1874,
title = {Kinetic description of polyatomic gases undergoing resonant collisions},
author = {Francesco Salvarani},
url = {https://cmat.uminho.pt/events/particle-systems-and-pdes-x},
year = {2022},
date = {2022-06-01},
booktitle = {Particle Systems and PDEs X},
address = {Braga, Portugal},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Kallel, Achraf; Dekran, Joyce; Abdallah, Abir Ben; Ballut, Sebastien
Temperature Evolution of PLA during Filaments FFF process Conference
3D Printing and Additive Manufacturing 2022, Copenhagen, Denmark, 2022.
@conference{kallel_2222,
title = {Temperature Evolution of PLA during Filaments FFF process},
author = {Achraf Kallel and Joyce Dekran and Abir Ben Abdallah and Sebastien Ballut},
url = {https://www.thescientistt.com/3dprinting/2022/index.php#important_dates},
year = {2022},
date = {2022-06-01},
booktitle = {3D Printing and Additive Manufacturing 2022},
address = {Copenhagen, Denmark},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Kanhonou, Michèle
La santé face aux systèmes d'information et aux cyber-attaques Miscellaneous
Xerfi Canal, 2022.
@misc{kanhonou_2249,
title = {La santé face aux systèmes d'information et aux cyber-attaques},
author = {Michèle Kanhonou},
url = {https://www.xerficanal.com/strategie-management/emission/La-sante-face-aux-systemes-d-information-et-aux-cyber-attaques_3750703.html},
year = {2022},
date = {2022-06-01},
howpublished = {Xerfi Canal},
keywords = {},
pubstate = {online},
tppubtype = {misc}
}
Abdallah, Abir Ben; Kallel, Achraf; Tcharkhtchi, Abbas; Hassine, Tarek; Gamaoun, Fehmi
Modeling of viscoelastic behavior of a shape memory polymer blend Journal Article
In: Journal Of Applied Polymer Science, vol. 139, no. 13, pp. 51859, 2022.
@article{ben_abdallah_1721,
title = {Modeling of viscoelastic behavior of a shape memory polymer blend},
author = {Abir Ben Abdallah and Achraf Kallel and Abbas Tcharkhtchi and Tarek Hassine and Fehmi Gamaoun},
url = {https://onlinelibrary.wiley.com/doi/10.1002/app.51859},
year = {2022},
date = {2022-05-01},
journal = {Journal Of Applied Polymer Science},
volume = {139},
number = {13},
pages = {51859},
abstract = {Shape memory effect (SME) of polymers is a property that concerns both,
macroscopic and microscopic changes. The variation of internal polymer
properties such, as molecular weight (Mw), rigidity, and viscoelasticity could
alter its SME. In this study, a bi-parabolic model with six parameters is used to
describe the viscoelastic behavior of a shape memory polymer (SMP) blend
(40% poly(caprolactone), PCL/60% Styrene-Butadiene-Styrene) with different
PCL Mw. These parameters are determined using the Cole-Cole method.
Modeling curves (E00 = f (E0)) will be then compared to experimental data from
dynamical mechanical analysis (DMA) tests. It is shown that the bi-parabolic
model predicts well the behavior of the SMP mixture for different Mw of PCL.
Afterwards, the evolution of the model parameters with the Mw of PCL is
investigated. It is revealed that, when Mw of PCL drops, the relaxation modulus
E0 increases. This result proves that the rigidity of the SMP blend rises with
Mw declines.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Boudin, Laurent; Salvarani, Francesco; Trélat, Emmanuel
Exponential Convergence Towards Consensus for Non-Symmetric Linear First-Order Systems in Finite and Infinite Dimensions Journal Article
In: Siam Journal On Mathematical Analysis, vol. 54, no. 3, pp. 2727-2752, 2022.
@article{boudin_1819,
title = {Exponential Convergence Towards Consensus for Non-Symmetric Linear First-Order Systems in Finite and Infinite Dimensions},
author = {Laurent Boudin and Francesco Salvarani and Emmanuel Trélat},
url = {https://epubs.siam.org/doi/abs/10.1137/21M1416102},
year = {2022},
date = {2022-05-01},
journal = {Siam Journal On Mathematical Analysis},
volume = {54},
number = {3},
pages = {2727-2752},
abstract = {We consider finite and infinite-dimensional first-order consensus systems with time- constant interaction coefficients. For symmetric coefficients, convergence to consensus is classically established by proving, for instance, that the usual variance is an exponentially decreasing Lyapunov function. We investigate here the convergence to consensus in the non-symmetric case: we identify a positive weight which allows us to define a weighted mean corresponding to the consensus and obtain exponential convergence towards consensus. Moreover, we compute the sharp exponential decay rate.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Taleb, Ihab; Guérard, Guillaume; Nguyen, Nga; Fauberteau, Frédéric
A Flexible Deep Learning Method for Energy Forecasting Journal Article
In: Energies, vol. 15, no. 11, pp. 3926, 2022.
@article{taleb_1836,
title = {A Flexible Deep Learning Method for Energy Forecasting},
author = {Ihab Taleb and Guillaume Guérard and Nga Nguyen and Frédéric Fauberteau},
url = {https://www.mdpi.com/1996-1073/15/11/3926},
year = {2022},
date = {2022-05-01},
journal = {Energies},
volume = {15},
number = {11},
pages = {3926},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Samah, Walid; Clain, Pascal; Fournaison, Laurence; Rioual, François; Delahaye, Anthony
Étude du comportement de mouillage d'une goutte d'eau sur une surface superhydrophobe en fonction de la température et de l'humidité Proceedings Article
In: 30ème congrès annuel de la Société Française de Thermique, Valenciennes, France, 2022.
@inproceedings{samah_1852,
title = {Étude du comportement de mouillage d'une goutte d'eau sur une surface superhydrophobe en fonction de la température et de l'humidité},
author = {Walid Samah and Pascal Clain and Laurence Fournaison and François Rioual and Anthony Delahaye},
url = {http://www.congres-sft.fr/2022/},
year = {2022},
date = {2022-05-01},
booktitle = {30ème congrès annuel de la Société Française de Thermique},
address = {Valenciennes, France},
abstract = {Cet article présente une étude sur le comportement de mouillage d'une gouttes sur une
surface recouverte d'un revêtement superhydrophobe à différentes températures de surface et humidités
relatives. Les résultats montrent que l'évolution des angles de contact pendant le refroidissement des
surfaces est influencée par deux phénomènes : le premier est l'évaporation des gouttes et le second est
la condensation de la vapeur d'eau sur ces surfaces à basse température. Un modèle semi-empirique
de l'évaporation d'une goutte sur une surface superhydrophobe est présenté et comparé aux résultats
expérimentaux.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Rettino, B; Hayward-Schneider, Thomas; Biancalani, Alessandro; Bottino, Alberto; Chavdarovski, I; Weiland, M; Vannini, Francesco; Jenko, F; Lauber, Philipp
Gyrokinetic modeling of anisotropic energetic particle driven instabilities in tokamak plasmas Journal Article
In: Nuclear Fusion, vol. 62, no. 7, pp. 076027, 2022.
@article{rettino_2297,
title = {Gyrokinetic modeling of anisotropic energetic particle driven instabilities in tokamak plasmas},
author = {B Rettino and Thomas Hayward-Schneider and Alessandro Biancalani and Alberto Bottino and I Chavdarovski and M Weiland and Francesco Vannini and F Jenko and Philipp Lauber},
url = {https://dx.doi.org/10.1088/1741-4326/ac6680},
year = {2022},
date = {2022-05-01},
journal = {Nuclear Fusion},
volume = {62},
number = {7},
pages = {076027},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Salvarani, Francesco
Applied Analysis, Complex Systems & Dynamics Seminar, Graz, Austria, 2022.
@conference{salvarani_1876,
title = {Exponential convergence towards consensus for non-symmetric linear first-order systems in finite and infinite dimensions},
author = {Francesco Salvarani},
url = {x},
year = {2022},
date = {2022-04-01},
booktitle = {Applied Analysis, Complex Systems & Dynamics Seminar},
address = {Graz, Austria},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Maarouf, Sarra; Bernardi, Christine; Yakoubi, Driss
Characteristics/finite element analysis for two incompressible fluid flows with surface tension using level set method Journal Article
In: Computer Methods In Applied Mechanics And Engineering, vol. 394, pp. 114843, 2022.
@article{maarouf_1803,
title = {Characteristics/finite element analysis for two incompressible fluid flows with surface tension using level set method},
author = {Sarra Maarouf and Christine Bernardi and Driss Yakoubi},
url = {https://www.sciencedirect.com/science/article/pii/S0045782522001530},
year = {2022},
date = {2022-03-01},
journal = {Computer Methods In Applied Mechanics And Engineering},
volume = {394},
pages = {114843},
abstract = {In this paper, we present and analyze a finite element level set method based on the method of characteristics for two phase
flow. Surface tension effects are taken into account by the CSF approach. We first write the variational formulation of the problem and investigate its well-posedness. Next, for the discretization, a first order method of characteristics approach for the
evolution of the level set function and for the material derivative of the velocity is used. The velocity and pressure unknowns
are discretized by P2? P1 Taylor-Hood finite elements. Then, in each time step, the interface transport is decoupled from the
Navier-Stokes equations. Well-posedness results for subproblems in this decoupled discrete problem are derived. Furthermore,
under high regularity assumptions, we state error estimates for our scheme. Ultimately, three computational examples illustrate
the performance of the proposed method.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Bobbia, Benjamin
A Dansker's Theorem for data driven local empirical measures Conference
Séminaire de l'équipe S2A Télécom Paris, Palaiseau, France, 2022.
@conference{bobbia_1856,
title = {A Dansker's Theorem for data driven local empirical measures},
author = {Benjamin Bobbia},
url = {x},
year = {2022},
date = {2022-03-01},
booktitle = {Séminaire de l'équipe S2A Télécom Paris},
address = {Palaiseau, France},
abstract = {Nowadays, empirical processes are well known objects. A reason that push forward theirs studies is that, in many models, we can write the estimators as images of empirical measures. In this work we investigate the case of local empirical measures built over a sub-sample with data conditioned to be in a certain area. There exists numerous results about such question, but what can we say if the area of interest is data driven ? In the present work we present a general framework which allows to derive asymptotic results for this particular empirical measures (with "low" cost in terms of technicality and assumptions). In this talk, this approach is specified for the framework of extreme values theory. In which we presente how tail and quantile estimation can be derived from a such methodology.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Thiam, Baye Gueye; Magri, Anouar El; Vanaei, Hamidreza; Vaudreuil, Sébastien
3D Printed and Conventional Membranes?A Review Journal Article
In: Polymers, vol. 14, no. 5, pp. 1023, 2022.
@article{gueye_thiam_2098,
title = {3D Printed and Conventional Membranes?A Review},
author = {Baye Gueye Thiam and Anouar El Magri and Hamidreza Vanaei and Sébastien Vaudreuil},
url = {https://doi.org/10.3390/polym14051023},
year = {2022},
date = {2022-03-01},
journal = {Polymers},
volume = {14},
number = {5},
pages = {1023},
abstract = {Polymer membranes are central to the proper operation of several processes used in a wide range of applications. The production of these membranes relies on processes such as phase inversion, stretching, track etching, sintering, or electrospinning. A novel and competitive strategy in membrane production is the use of additive manufacturing that enables the easier manufacture of tailored membranes. To achieve the future development of better membranes, it is necessary to compare this novel production process to that of more conventional techniques, and clarify the advantages and disadvantages. This review article compares a conventional method of manufacturing polymer membranes to additive manufacturing. A review of 3D printed membranes is also done to give researchers a reference guide. Membranes from these two approaches were compared in terms of cost, materials, structures, properties, performance. and environmental impact. Results show that very few membrane materials are used as 3D-printed membranes. Such membranes showed acceptable performance, better structures, and less environmental impact compared with those of conventional membranes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Bobbia, Benjamin
Donsker's Theorem for local Data-Driven Empirical Measure Conference
Séminaire du laboratoire Modal X, Nanterre, France, 2022.
@conference{bobbia_1773,
title = {Donsker's Theorem for local Data-Driven Empirical Measure},
author = {Benjamin Bobbia},
url = {x},
year = {2022},
date = {2022-02-01},
booktitle = {Séminaire du laboratoire Modal X},
address = {Nanterre, France},
abstract = {Nowadays, empirical processes are well known objects. A reason that push forward theirs studies is that, in many models, we can write the estimators as images of empirical measures. In this work we investigate the case of local empirical measures built over a sub-sample with data conditioned to be in a certain area. There exists numerous results about such question, but what can we say if the area of interest is data driven ? In the present work we present a general framework which allows to derive asymptotic results for this particular empirical measures (with "low" cost in terms of technicality and assumptions). Then, we use this approach in the framework of extreme values theory deriving tail and quantile estimations.},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}