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
Chami, Nada; Salehy, Yasmine; Clain, Pascal; Dalmazzone, Didier; Delahaye, Anthony; Fournaison, Laurence
Thermal and energy evaluation of mixed CP+CO2 hydrate slurries Conference
5ème Journées annuelles Hydrates, GDR2026, Hydrates de gaz IFPEN, Rueil-Malmaison, France, 2022.
@conference{chami_1910,
title = {Thermal and energy evaluation of mixed CP+CO2 hydrate slurries},
author = {Nada Chami and Yasmine Salehy and Pascal Clain and Didier Dalmazzone and Anthony Delahaye and Laurence Fournaison},
year = {2022},
date = {2022-12-01},
booktitle = {5ème Journées annuelles Hydrates},
address = {IFPEN, Rueil-Malmaison, France},
organization = {GDR2026, Hydrates de gaz},
abstract = {A thermal and energy study of mixed CP + CO2 hydrate slurries is presented to determine the hydrate fraction formed in the loop and to quantify the energy restituted by the mixed hydrate.
The work performed on mixed CP + CO2 hydrate slurries required the establishment of an experimental continuous circulation loop. A heat exchanger is connected to the loop to ensure the hydrates dissociation in order to determine the heat amount involved during the phase change. Thermal studies were also performed to determine the heat exchange coefficients.},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Osswald, Véronique; Clain, Pascal; Dalmazzone, Didier; Chami, Nada; Salehy, Yasmine; Delahaye, Anthony; Fournaison, Laurence
Kinetic study of CO2 hydrates crystallization in stirred tank reactor based on heat balance Conference
5ème Journées annuelles Hydrates, GDR2026, Hydrates de gaz IFPEN, Rueil-Malmaison, France, 2022.
@conference{osswald_1911,
title = {Kinetic study of CO2 hydrates crystallization in stirred tank reactor based on heat balance},
author = {Véronique Osswald and Pascal Clain and Didier Dalmazzone and Nada Chami and Yasmine Salehy and Anthony Delahaye and Laurence Fournaison},
year = {2022},
date = {2022-12-01},
booktitle = {5ème Journées annuelles Hydrates},
address = {IFPEN, Rueil-Malmaison, France},
organization = {GDR2026, Hydrates de gaz},
abstract = {CO2 hydrate crystallization kinetics monitoring performs traditionally by a reactor mass balance. However, this method requires assumptions on CO2 liquid phase concentration and the number of hydration. This work presents the development of a specific method and device to determine the kinetics through direct measurement of the heat flow through the reactor shell and its evaluation compared with the mass balance method. The kinetic effect of two parameters (stirring speed, stirrer type) is outlined.},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Salehy, Yasmine; Clain, Pascal; Chami, Nada; Osswald, Véronique; Delahaye, Anthony; Fournaison, Laurence
Rheological analysis of CO2 hydrate slurries in the presence of different additives Conference
5ème Journées annuelles Hydrates, GDR2026, Hydrates de gaz IFPEN, Rueil-Malmaison, France, 2022.
@conference{salehy_1912,
title = {Rheological analysis of CO2 hydrate slurries in the presence of different additives},
author = {Yasmine Salehy and Pascal Clain and Nada Chami and Véronique Osswald and Anthony Delahaye and Laurence Fournaison},
year = {2022},
date = {2022-12-01},
booktitle = {5ème Journées annuelles Hydrates},
address = {IFPEN, Rueil-Malmaison, France},
organization = {GDR2026, Hydrates de gaz},
abstract = {The rheological properties of OC2 hydrate slurries in the presence of additives are analyzed. The investigations are based on the capillary viscometer method and the experimental studies are conducted in a controled dynamic flow loop allowing to measure the pressure drop and flow rate. Then, the Hershel-Buckley model is used to determine the behavioral properties of the slurries. Finally, a discussion on the assumptions and limitations of this approach is proposed.},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Arreola, Fernanda; Clain, Pascal
Quantum startup: using an analogy for theory development in the study of breakthrough innovation. Inproceedings
In: OMT - IAE Business School PDW, Organization & Management Theory Academy of Management, Derqui, Province of Buenos Aires, 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},
year = {2022},
date = {2022-11-01},
booktitle = {OMT - IAE Business School PDW},
publisher = {Academy of Management},
address = {Derqui, Province of Buenos Aires, Argentina},
organization = {Organization & Management Theory},
keywords = {},
pubstate = {accepted},
tppubtype = {inproceedings}
}
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}
}
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}
}
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. 1-24, 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 = {1-24},
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}
}
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}
}
Nohra, Perla; Rejeb, Helmi Ben; Venkateswaran, Swaminath
Impact of automation during innovative remanufacturing processes in circular economy Inproceedings
In: 28th IEEE ICE/ITMC & 31st IAMOT Conference IEEE, Nancy, France, 2022, ISBN: TBC.
@inproceedings{nohra_1814,
title = {Impact of automation during innovative remanufacturing processes in circular economy},
author = {Perla Nohra and Helmi Ben Rejeb and Swaminath Venkateswaran},
url = {TBC},
issn = {TBC},
year = {2022},
date = {2022-06-01},
booktitle = {28th IEEE ICE/ITMC & 31st IAMOT Conference IEEE},
address = {Nancy, France},
abstract = {With the increasing demand of raw materials nowadays, and the decrease in supplies, the industrial sector is suffering, while the environment and the society are also indirectly affected. The goal to reach a sustainable development imposes several studies on the economic, environmental and community level. The aim of this paper is to provide an overview of the existing literature on automating remanufacturing, and its impacts on the three pillars of sustainability. The outcomes of this study will reveal the impacts of remanufacturing on sustainability and will conceptualize the impact of using automation and cobots, which are among the key concepts in industry 4.0. The investigation that covers each part of the remanufacturing process will help in formalizing an approach about the automation of such processes and improve the remanufacturing sector towards a more sustainable industry.},
keywords = {},
pubstate = {accepted},
tppubtype = {inproceedings}
}
Guérard, Guillaume; Taleb, Ihab; Nguyen, Nga; Fauberteau, Frédéric
Modélisation Multi-Agent pour les Réseaux Energétique Insulaires Inproceedings
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 Nga Nguyen and Frédéric Fauberteau},
year = {2022},
date = {2022-06-01},
booktitle = {Journées Francophones sur les Systèmes Multi-Agents},
address = {Saint-Etienne, France},
keywords = {},
pubstate = {accepted},
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 Inproceedings
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 = {accepted},
tppubtype = {inproceedings}
}
Osswald, Véronique; Clain, Pascal; Dalmazzone, Didier; Delahaye, Anthony; Fournaison, Laurence
Experimental heat transfer measurement applied to CO2 hydrate formation kinetic study Inproceedings
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 = {accepted},
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 Inproceedings
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 = {accepted},
tppubtype = {inproceedings}
}
Bobbia, Benjamin
Théorème de Donsker pour des mesures empiriques locales sur des régions aléatoires Conference
53-ème journées de statistique, Lyon, France, 2022.
@conference{bobbia_1855,
title = {Théorème de Donsker pour des mesures empiriques locales sur des régions aléatoires},
author = {Benjamin Bobbia},
year = {2022},
date = {2022-06-01},
booktitle = {53-ème journées de statistique},
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 = {accepted},
tppubtype = {conference}
}
Clain, Pascal; Fournaison, Laurence; Rioual, François; Delahaye, Anthony
In: 30ème congrès annuel de la Société Française de Thermique, Valenciennes, France, 2022.
@inproceedings{clain_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 = {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 = {accepted},
tppubtype = {inproceedings}
}
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}
}
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
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 = {accepted},
tppubtype = {inproceedings}
}
Salvarani, Francesco
Exponential convergence towards consensus for non-symmetric linear first-order systems in finite and infinite dimensions Conference
Applied Analysis, Complex Systems & Dynamics Seminar, Graz, Autriche, 2022.
@conference{salvarani_1876,
title = {Exponential convergence towards consensus for non-symmetric linear first-order systems in finite and infinite dimensions},
author = {Francesco Salvarani},
year = {2022},
date = {2022-04-01},
booktitle = {Applied Analysis, Complex Systems & Dynamics Seminar},
address = {Graz, Autriche},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Yakoubi, Driss; Bernardi, Christine; Maarouf, Sarra
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, no. XXXX, pp. Paper No. 114843, 2022.
@article{yakoubi_1803,
title = {Characteristics/finite element analysis for two incompressible fluid flows with surface tension using level set method},
author = {Driss Yakoubi and Christine Bernardi and Sarra Maarouf},
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},
number = {XXXX},
pages = {Paper No. 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}
}
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},
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 = {accepted},
tppubtype = {conference}
}
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},
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 = {accepted},
tppubtype = {conference}
}
Yakoubi, Driss; Deteix, Jean; Kouamoa, Gerard Lionel Ndetchoua
A new energy stable fractional time stepping scheme for the Navier-Stokes/Allen-Cahn diffuse interface model Journal Article
In: Computer Methods In Applied Mechanics And Engineering, vol. 393, no. XXXX, pp. Paper No. 114759, 25, 2022.
@article{yakoubi_1802,
title = {A new energy stable fractional time stepping scheme for the Navier-Stokes/Allen-Cahn diffuse interface model},
author = {Driss Yakoubi and Jean Deteix and Gerard Lionel Ndetchoua Kouamoa},
url = {https://www.sciencedirect.com/science/article/pii/S0045782522001104},
year = {2022},
date = {2022-02-01},
journal = {Computer Methods In Applied Mechanics And Engineering},
volume = {393},
number = {XXXX},
pages = {Paper No. 114759, 25},
abstract = {In this work, we present an original time-discrete formulation of the coupled equations relating the velocity and pressure
of an unsteady flow of two immiscible fluids and the Allen-Cahn equation describing the interface between both of them. We
first prove this time-discrete formulation (based on the concept of coupled projection scheme (Deteix et al., 2014)) to be well
posed and energy stable. We then propose a new family of iterative schemes for the actual approximation of solutions. We
complete this work with numerical tests illustrating the order of accuracy and applying the new scheme on the well known
rising bubble benchmark.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Deteix, Jean; Kouamoa, Gerard Lionel Ndetchoua; Yakoubi, Driss
A new energy stable fractional time stepping scheme for the Navier-Stokes/Allen-Cahn diffuse interface model Journal Article
In: Computer Methods In Applied Mechanics And Engineering, vol. 393, pp. 114759, 2022.
@article{deteix_1802,
title = {A new energy stable fractional time stepping scheme for the Navier-Stokes/Allen-Cahn diffuse interface model},
author = {Jean Deteix and Gerard Lionel Ndetchoua Kouamoa and Driss Yakoubi},
url = {https://www.sciencedirect.com/science/article/pii/S0045782522001104},
year = {2022},
date = {2022-02-01},
journal = {Computer Methods In Applied Mechanics And Engineering},
volume = {393},
pages = {114759},
abstract = {In this work, we present an original time-discrete formulation of the coupled equations relating the velocity and pressure
of an unsteady flow of two immiscible fluids and the Allen-Cahn equation describing the interface between both of them. We
first prove this time-discrete formulation (based on the concept of coupled projection scheme (Deteix et al., 2014)) to be well
posed and energy stable. We then propose a new family of iterative schemes for the actual approximation of solutions. We
complete this work with numerical tests illustrating the order of accuracy and applying the new scheme on the well known
rising bubble benchmark.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Yakoubi, Driss
A projection scheme for phase change problems with convection Journal Article
In: Computers & Mathematics With Applications, vol. 108, no. 1, pp. 109-122, 2022.
@article{yakoubi_1795,
title = {A projection scheme for phase change problems with convection},
author = {Driss Yakoubi},
url = {https://www-sciencedirect-com.acces.bibl.ulaval.ca/science/article/pii/S0898122122000013?via%3Dihub},
year = {2022},
date = {2022-01-01},
journal = {Computers & Mathematics With Applications},
volume = {108},
number = {1},
pages = {109-122},
abstract = {Numerical modeling of phase change problems with convection is known to be computationally expensive. The main challenge comes from the coupling between Navier-Stokes and heat energy equations. In this paper, we develop a new scheme for phase change problems based on a projection method. The proposed method reduces the size of the system by splitting the temperature, the velocity, and the pressure fields while preserving the accuracy of the simulations. A single-domain approach using a variant of the enthalpy-porosity formulation is employed. Incompressible Navier-Stokes problem with Boussinesq approximation for thermal effects in solid and liquid regions is considered. We regularize the discontinuous variables such as latent heat and material properties by a continuous and differentiable hyperbolic tangent function. The robustness and effectiveness of the proposed scheme are illustrated by comparing the numerical results with numerical and experimental benchmark},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Guérard, Guillaume; Djebali, Sonia; Gabot, Quentin
Tourists Profiling by Interest Analysis Inproceedings
In: International Conference on Advanced Data Mining and Applications, pp. 42-53, Springer, Cham, Virtual, 2022, ISBN: 978-3-030-95407-9.
@inproceedings{guerard_1662,
title = {Tourists Profiling by Interest Analysis},
author = {Guillaume Guérard and Sonia Djebali and Quentin Gabot},
url = {https://link.springer.com/chapter/10.1007/978-3-030-95408-6_4},
issn = {978-3-030-95407-9},
year = {2022},
date = {2022-01-01},
booktitle = {International Conference on Advanced Data Mining and Applications},
volume = {13088},
pages = {42-53},
publisher = {Springer, Cham},
address = {Virtual},
abstract = {With the recent digital revolution, analyzing of tourists' behaviors
and research elds associated with it have changed profoundly.
It is now easier to examine behaviors of tourists using digital traces they
leave during their travels. The studies conducted on diverse aspects of
tourism focus on quantitative aspects of digital traces to reach its conclusions.
In this paper, we suggest a study focused on both qualitative and
quantitative aspect of digital traces to understand the dynamics governing
tourist behavior, especially those concerning attractions networks.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Montiel, Antoine; Sargueil, Paul; Nguyen, Thuy; Rountree, Cindy; Geertsen, Valérie; Guenoun, Patrick; Bonamy, Daniel
Mechanical & fracture behaviour of microlattice metamaterial with disordered architecture Conference
Mécanique des Matériaux Architecturés, MacaMat Aussois, France, 2022.
@conference{montiel_1775,
title = {Mechanical & fracture behaviour of microlattice metamaterial with disordered architecture},
author = {Antoine Montiel and Paul Sargueil and Thuy Nguyen and Cindy Rountree and Valérie Geertsen and Patrick Guenoun and Daniel Bonamy},
url = {https://aussois2022.sciencesconf.org/},
year = {2022},
date = {2022-01-01},
booktitle = {Mécanique des Matériaux Architecturés},
address = {Aussois, France},
organization = {MacaMat},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Haddad, Mireille El; Belhamadia, Youssef; Deteix, Jean; Yakoubi, Driss
A projection scheme for phase change problems with convection Journal Article
In: Computers & Mathematics With Applications, vol. 108, no. 1, pp. 109-122, 2022.
@article{el_haddad_1795,
title = {A projection scheme for phase change problems with convection},
author = {Mireille El Haddad and Youssef Belhamadia and Jean Deteix and Driss Yakoubi},
url = {https://www-sciencedirect-com.acces.bibl.ulaval.ca/science/article/pii/S0898122122000013?via%3Dihub},
year = {2022},
date = {2022-01-01},
journal = {Computers & Mathematics With Applications},
volume = {108},
number = {1},
pages = {109-122},
abstract = {Numerical modeling of phase change problems with convection is known to be computationally expensive. The main challenge comes from the coupling between Navier-Stokes and heat energy equations. In this paper, we develop a new scheme for phase change problems based on a projection method. The proposed method reduces the size of the system by splitting the temperature, the velocity, and the pressure fields while preserving the accuracy of the simulations. A single-domain approach using a variant of the enthalpy-porosity formulation is employed. Incompressible Navier-Stokes problem with Boussinesq approximation for thermal effects in solid and liquid regions is considered. We regularize the discontinuous variables such as latent heat and material properties by a continuous and differentiable hyperbolic tangent function. The robustness and effectiveness of the proposed scheme are illustrated by comparing the numerical results with numerical and experimental benchmark},
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 = {2022-01-01},
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}
}
Gürcan, Özgür; Anderson, Johan; Moradi, Sara; Biancalani, Alessandro; Morel, Pierre
Phase and amplitude evolution in the network of triadic interactions of the Hasegawa-Wakatani system Journal Article
In: Physics Of Plasmas, vol. 29, no. 5, pp. 052306, 2022.
@article{gurcan_1825,
title = {Phase and amplitude evolution in the network of triadic interactions of the Hasegawa-Wakatani system},
author = {Özgür Gürcan and Johan Anderson and Sara Moradi and Alessandro Biancalani and Pierre Morel},
url = {https://aip.scitation.org/doi/10.1063/5.0089073},
year = {2022},
date = {2022-01-01},
journal = {Physics Of Plasmas},
volume = {29},
number = {5},
pages = {052306},
abstract = {The Hasegawa-Wakatani system, commonly used as a toy model of dissipative drift waves in fusion devices, is revisited with considerations
of phase and amplitude dynamics of its triadic interactions. It is observed that a single resonant triad can saturate via three way phase
locking, where the phase differences between dominant modes converge to constant values as individual phases increase in time. This allows
the system to have approximately constant amplitude solutions. Non-resonant triads show similar behavior only when one of its legs is a
zonal wave number. However, when an additional triad, which is a reflection of the original one with respect to the y axis is included, the
behavior of the resulting triad pair is shown to be more complex. In particular, it is found that triads involving small radial wave numbers
(large scale zonal flows) end up transferring their energy to the subdominant mode which keeps growing exponentially, while those involving
larger radial wave numbers (small scale zonal flows) tend to find steady chaotic or limit cycle states (or decay to zero). In order to study the
dynamics in a connected network of triads, a network formulation is considered, including a pump mode, and a number of zonal and non-
zonal subdominant modes as a dynamical system. It was observed that the zonal modes become clearly dominant only when a large number
of triads are connected. When the zonal flow becomes dominant as a ?collective mean field,? individual interactions between modes become
less important, which is consistent with the inhomogeneous wave-kinetic picture. Finally, the results of direct numerical simulation are dis-
cussed for the same parameters, and various forms of the order parameter are computed. It is observed that nonlinear phase dynamics results
in a flattening of the large scale phase velocity as a function of scale in direct numerical simulations.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Chami, Nada; Bendjenni, Sabrina; Clain, Pascal; Osswald, Véronique; Delahaye, Anthony; Fournaison, Laurence; Dalmazzone, Didier
In: Chemical Engineering Journal, vol. 244, no. -, pp. 116790, 2021.
@article{chami_1564,
title = {Thermodynamic characterization of mixed gas hydrates in the presence of cyclopentane as guest molecule for an application in secondary refrigeration},
author = {Nada Chami and Sabrina Bendjenni and Pascal Clain and Véronique Osswald and Anthony Delahaye and Laurence Fournaison and Didier Dalmazzone},
url = {https://www.sciencedirect.com/science/article/pii/S0009250921003559},
year = {2021},
date = {2021-11-01},
journal = {Chemical Engineering Journal},
volume = {244},
number = {-},
pages = {116790},
abstract = {Gas hydrates have drawn the attention of many scientists because of their potential role in energy applications. By using some thermodynamic promoters, it is possible to form hydrates at reduced pressure and near ambient temperature, which are suitable formation conditions for most industries. In this study, a high pressure micro differential scanning calorimeter was used to measure the dissociation conditions of mixed cyclopentane (c-C5H10) + CO2 hydrates in the system composed of liquid water + liquid hydrocarbon + hydrate + vapour, in a pressure range of 0 to 4.3 MPa in a temperature range of 280 to 292 K. The analysis of the heat flow curve allowed the direct determination of the dissociation enthalpy of c-C5H10 + CO2 hydrates (e.g., ?H=462.5±1.5 kJ. kg-1 water at equilibrium pressure 0.25 MPa) and the average mass heat capacity of c-C5H10 + CO2 hydrates in a temperature range o 277.9-281.2 K (CpH = 1479.09 ± 137.43 J. K-1. kg-1 hydrate at 0.25 MPa).},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Guérard, Guillaume; Pousseur, Hugo; Taleb, Ihab
Isolated Areas Consumption Short-Term Forecasting Method Journal Article
In: Energies, vol. 14, no. 23, pp. 7914, 2021.
@article{guerard_1732,
title = {Isolated Areas Consumption Short-Term Forecasting Method},
author = {Guillaume Guérard and Hugo Pousseur and Ihab Taleb},
url = {https://www.mdpi.com/1996-1073/14/23/7914},
year = {2021},
date = {2021-11-01},
journal = {Energies},
volume = {14},
number = {23},
pages = {7914},
abstract = {Forecasting consumption in isolated areas represents a challenging problem typically resolved using deep learning or huge mathematical models with various dimensions. Those models require expertise in metering and algorithms and the equipment needs to be frequently maintained. In the context of the MAESHA H2020 project, most of the consumers and producers are isolated. Forecasting becomes more difficult due to the lack of external data and the significant impact of human behaviors on those small systems. The proposed approach is based on data sequencing, sequential mining, and pattern mining to infer the results into a Hidden Markov Model. It only needs the consumption and production curve as a time series and adapts itself to provide the forecast. Our method gives a better forecast than other prediction machines and deep-learning methods used in literature review.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Bobbia, Benjamin
Donsker's Theorem for local data-driven empirical measures Conference
Forum Jeunes Mathématiciens, Besançon, france, 2021.
@conference{bobbia_1772,
title = {Donsker's Theorem for local data-driven empirical measures},
author = {Benjamin Bobbia},
year = {2021},
date = {2021-11-01},
booktitle = {Forum Jeunes Mathématiciens},
address = {Besançon, france},
abstract = {Nowadays, empirical processes are well known object. A reason that push forward theirs studies is that, in many modelisations, we can write the estimators as images of empirical measures. In this work we investigate the case of local empirical measures, that is the empirical measure built over a subsample with data conditionned to be in a certain area. There exist numerous results about such result, but what can we say if the previous area is data driven ? We can handle this situation with high technical cost and additional assumptions. The main aim of the present work is to present a general framework which allows to derive asymptotic results for this particular empirical measures with lower cost (in terms of technicality and assumptions). We give a Donsker-type theorem for such measures and present some domains of application as extreme values theory or multivariate regular variations},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Guérard, Guillaume; Levy, Loup-Noé; Amor, Sofiane Ben; Tran, Hai; Bosom, Jérémie
Modeling and recommendation system for improving the energy performance of buildings Inproceedings
In: Inoue, Masataka (Ed.): DCAI 2021: Distributed Computing and Artificial Intelligence, Volume 2: Special Sessions 18th International Conference, pp. 206-209, Springer, Cham, virtual, 2021, ISBN: 978-3-030-86886-4.
@inproceedings{guerard_1603,
title = {Modeling and recommendation system for improving the energy performance of buildings},
author = {Guillaume Guérard and Loup-Noé Levy and Sofiane Ben Amor and Hai Tran and Jérémie Bosom},
editor = {Masataka Inoue},
url = {https://link.springer.com/chapter/10.1007/978-3-030-86887-1_22},
issn = {978-3-030-86886-4},
year = {2021},
date = {2021-10-01},
booktitle = {DCAI 2021: Distributed Computing and Artificial Intelligence, Volume 2: Special Sessions 18th International Conference},
pages = {206-209},
publisher = {Springer, Cham},
address = {virtual},
abstract = {The energy performance of building represents a major issue of the 21st century.
However, buildings are complex sociotechnical systems because of the massification, heterogeneity and multiplicity of related data.
Therefore, evaluating their performance and giving relevant recommendation is a challenging task.
In this article, we propose a contributory algorithmic recommendation system applicable to energy performance diagnostic and prediction.
Doing so requires to overcome many theoretical and technical issues related to big data infrastructure, machine learning factory, and DevOps.
The thesis is done through Energisme's platform.
It presents a collection and deployment of algorithmic solutions for optimized energy management in private and public organizations.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Chami, Nada; Clain, Pascal; Osswald, Véronique; Delahaye, Anthony; Fournaison, Laurence; Dalmazzone, Didier
Characterization of mixed CP + CO2 hydrates for refrigeration applications Inproceedings
In: 13th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning, Vicenza, Italy, 2021.
@inproceedings{chami_1565,
title = {Characterization 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},
url = {http://static.gest.unipd.it/PCM2021/},
year = {2021},
date = {2021-09-01},
booktitle = {13th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning},
address = {Vicenza, Italy},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Haouache, Somia; Clain, Pascal; Capron, Isabelle; Fournaison, Laurence
In: 13th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning, Vicenza, Italy, 2021.
@inproceedings{haouache_1566,
title = {The influence of droplet size and hexadecane volume fraction on the rheological behavior of hexadecane-in-water emulsion stabilized by cellulose nanocrystals},
author = {Somia Haouache and Pascal Clain and Isabelle Capron and Laurence Fournaison},
url = {http://static.gest.unipd.it/PCM2021/},
year = {2021},
date = {2021-09-01},
booktitle = {13th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning},
address = {Vicenza, Italy},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Osswald, Véronique; Clain, Pascal; Dalmazzone, Didier; Delahaye, Anthony; Fournaison, Laurence
Kinetic study ofCO2 hydrate formation based on heat transfer measurement Inproceedings
In: 13th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning, Vicenza, Italy, 2021.
@inproceedings{osswald_1567,
title = {Kinetic study ofCO2 hydrate formation based on heat transfer measurement},
author = {Véronique Osswald and Pascal Clain and Didier Dalmazzone and Anthony Delahaye and Laurence Fournaison},
url = {http://static.gest.unipd.it/PCM2021/},
year = {2021},
date = {2021-09-01},
booktitle = {13th IIR Conference on Phase-Change Materials and Slurries for Refrigeration and Air Conditioning},
address = {Vicenza, Italy},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Guérard, Guillaume; Amor, Sofiane Ben; Charlier, Philippe; Augias, Anais
In: ETHICS, MEDICINE AND PUBLIC HEALTH, vol. 18, no. September, pp. 1-6, 2021.
@article{guerard_1604,
title = {USoM platform. Proposal for an international and transdisciplinary interactive tool for centralization and anthropological exchange around human remains},
author = {Guillaume Guérard and Sofiane Ben Amor and Philippe Charlier and Anais Augias},
url = {https://www.sciencedirect.com/science/article/pii/S2352552521000542},
year = {2021},
date = {2021-09-01},
journal = {ETHICS, MEDICINE AND PUBLIC HEALTH},
volume = {18},
number = {September},
pages = {1-6},
abstract = {Background
In a previous article related to ethical reflection around the study of human remains and their biological products in archaeological, ethnographic and museum contexts, a general scientific isolation - going against the common interest and leading to certain forms of misconduct - had been raised. It appeared a real need to act in the direction of transparency and a transdisciplinary union.
Methodology
This conclusion led to further reflection on the strengths and technical creation of a tool dedicated to the exchange between sciences relating to the study of man.
Results/Discussion
We propose the creation of a platform dedicated to all international scientific actors whose issues are related to research on humans. This involves proposing the development of a participatory/collaborative virtual platform on which scientific organizations would exchange their study materials, their samples, their tools, their knowledge, their reflections and hypotheses and then the resulting data in order to no longer work in isolation.
Conclusion/Perspectives
This multidisciplinary vision to the study of Man, without spatial or chronological boundaries, will be a contribution to each of the disciplines involved and the benefits of this platform are multiple. However, this coalition approach exposes academic, technical and legal difficulties and represents a real challenge because it requires profound changes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Augias, Anais; Amor, Sofiane Ben; Charlier, Philippe; Guérard, Guillaume
In: ETHICS, MEDICINE AND PUBLIC HEALTH, vol. 18, pp. 100677, 2021.
@article{augias_1604,
title = {USoM platform. Proposal for an international and transdisciplinary interactive tool for centralization and anthropological exchange around human remains},
author = {Anais Augias and Sofiane Ben Amor and Philippe Charlier and Guillaume Guérard},
url = {https://www.sciencedirect.com/science/article/pii/S2352552521000542},
year = {2021},
date = {2021-09-01},
journal = {ETHICS, MEDICINE AND PUBLIC HEALTH},
volume = {18},
pages = {100677},
abstract = {Background
In a previous article related to ethical reflection around the study of human remains and their biological products in archaeological, ethnographic and museum contexts, a general scientific isolation - going against the common interest and leading to certain forms of misconduct - had been raised. It appeared a real need to act in the direction of transparency and a transdisciplinary union.
Methodology
This conclusion led to further reflection on the strengths and technical creation of a tool dedicated to the exchange between sciences relating to the study of man.
Results/Discussion
We propose the creation of a platform dedicated to all international scientific actors whose issues are related to research on humans. This involves proposing the development of a participatory/collaborative virtual platform on which scientific organizations would exchange their study materials, their samples, their tools, their knowledge, their reflections and hypotheses and then the resulting data in order to no longer work in isolation.
Conclusion/Perspectives
This multidisciplinary vision to the study of Man, without spatial or chronological boundaries, will be a contribution to each of the disciplines involved and the benefits of this platform are multiple. However, this coalition approach exposes academic, technical and legal difficulties and represents a real challenge because it requires profound changes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Nguyen, Thuy; Bonamy, Daniel
Lattice trapping and fracture toughness selection in britttle crystals Inproceedings
In: 25th International Congress of Theoretical and Applied Mechanics, Milano, Italy, 2021.
@inproceedings{nguyen_1272,
title = {Lattice trapping and fracture toughness selection in britttle crystals},
author = {Thuy Nguyen and Daniel Bonamy},
url = {https://www.ictam2020.org/},
year = {2021},
date = {2021-08-01},
booktitle = {25th International Congress of Theoretical and Applied Mechanics},
address = {Milano, Italy},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Jaffal-Moutarda, Basma
Global existence of the 3D rotating second grade fluid system Journal Article
In: Asymptotic Analysis, vol. 124, no. 3-4, pp. 259-290, 2021.
@article{jaffal-moutarda_1356,
title = {Global existence of the 3D rotating second grade fluid system},
author = {Basma Jaffal-Moutarda},
url = {https://content.iospress.com/articles/asymptotic-analysis/asy201644},
year = {2021},
date = {2021-08-01},
journal = {Asymptotic Analysis},
volume = {124},
number = {3-4},
pages = {259-290},
abstract = {We consider the equations of a rotating incompressible non-Newtonian fluid flow of grade two in a three dimensional torus. We prove two different results of global existence of strong solutions. In the first case, we consider that the elasticity coefficient ? is arbitrary and we suppose that the third components of the vertical average of the initial data and of the forcing term are small compared to the horizontal components. In the second case, we consider a forcing term and initial data of arbitrary size but we restrict the size of ?. In both cases, we show that the limit system is composed of a linear system and a second grade fluid system with two variables and three components.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Montiel, Antoine; Nguyen, Thuy; Perchelet, M; Geertsen, Valérie; Rountree, Cindy; Guenoun, Patrick; Bonamy, Daniel
Mechanical and fracture behaviour of microlattice-based metamaterial with disordered architecture Inproceedings
In: 25th International Congress of Theoretical and Applied Mechanics, Milan, Italy, 2021.
@inproceedings{montiel_1498,
title = {Mechanical and fracture behaviour of microlattice-based metamaterial with disordered architecture},
author = {Antoine Montiel and Thuy Nguyen and M Perchelet and Valérie Geertsen and Cindy Rountree and Patrick Guenoun and Daniel Bonamy},
url = {https://www.ictam2020.org/},
year = {2021},
date = {2021-08-01},
booktitle = {25th International Congress of Theoretical and Applied Mechanics},
address = {Milan, Italy},
abstract = {Microlattice based metamaterials made of periodically arranged hollow microtubes appear as highly promising materials; they
both combine ultra-low density and sufficient stiffness and mechanical strength to envisage their use as structure material, in the aeronautical
industry for instance. Still, until now, most studies have considered periodically ordered architectures. Here, we explored amorphous
architectures and analysed how the disorder amount plays on the mechanical and failure properties. The presented study relies on both
numerical simulations using Timoshenko beam model and experiments performed on 3D-printed samples, the architecture of which mimics
that of the simulated samples},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Bobbia, Benjamin; Dombry, Clément; Varron, Davit
The coupling method in extreme value theory Journal Article
In: Bernoulli, vol. 27, no. 3, pp. 1824-1850, 2021.
@article{bobbia_1682,
title = {The coupling method in extreme value theory},
author = {Benjamin Bobbia and Clément Dombry and Davit Varron},
url = {https://projecteuclid.org/journals/bernoulli/volume-27/issue-3/The-coupling-method-in-extreme-value-theory/10.3150/20-BEJ1293.short},
year = {2021},
date = {2021-08-01},
journal = {Bernoulli},
volume = {27},
number = {3},
pages = {1824-1850},
abstract = {A coupling method is developed for univariate extreme value theory, providing an alternative to the use of the tail empirical/quantile processes. We emphasize the Peak-over-Threshold approach that approximates the distribution above high threshold by the Generalized Pareto Distribution (GPD) and compare the empirical distribution of exceedances to the empirical distribution associated with the limit GPD model. Sharp bounds for their Wasserstein distance in the second order Wasserstein space are provided. As an application, we recover standard results on the asymptotic behavior of the Hill estimator, the Weissman extreme quantile estimator or the probability weighted moment estimators, shedding some new light on the theory.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Kallel, Achraf; Abdallah, Abir Ben; Gamaoun, Fehmi; Tcharkhtchi, Abbas; BenDaly, Hachmi; Fitoussi, Joseph
Driving force for shape memory effect of polymers Journal Article
In: Journal Of Polymer Research, vol. 28, no. 10, pp. 308, 2021.
@article{kallel_1585,
title = {Driving force for shape memory effect of polymers},
author = {Achraf Kallel and Abir Ben Abdallah and Fehmi Gamaoun and Abbas Tcharkhtchi and Hachmi BenDaly and Joseph Fitoussi},
url = {https://link.springer.com/article/10.1007/s10965-021-02637-4},
year = {2021},
date = {2021-07-01},
journal = {Journal Of Polymer Research},
volume = {28},
number = {10},
pages = {308},
abstract = {In this study, we aim to evaluate the shape memory effect of a Poly (Caprolactone) (PCL) (40%) and a Styrene-Butadiene-Styrene (SBS) (60%) blend. Shape memory cycle tests are performed at different temperatures to detect the best recovery rate. Under appropriate temperature, the blend recovers substantially its original shape. To study the recovery rate evolution, multi cycle tests are realized with controlled temperature. The results indicate that the shape memory effect growths when the number of cycle increases. The stored energy acts as a driving force to bring the polymer to its permanent shape after each loading cycle. Then, an original method is proposed to measure the stress-strain evolution during the recovery. With a variable temperature, no standard test can follow the stress-strain evolution. This test is needed to validate the behavior model.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Salvarani, Francesco
Particle Systems and PDEs IX, Braga, Portugal, 2021.
@conference{salvarani_1877,
title = {Exponential convergence towards consensus for non-symmetric linear first-order systems in finite and infinite dimensions},
author = {Francesco Salvarani},
url = {https://w3.math.uminho.pt/PSPDEix/},
year = {2021},
date = {2021-07-01},
booktitle = {Particle Systems and PDEs IX},
address = {Braga, Portugal},
keywords = {},
pubstate = {accepted},
tppubtype = {conference}
}
Hamdache, Kamel; Hamroun, Djamila
Macroscopic limit of the kinetic Bloch equation Journal Article
In: Kinetic And Related Models, vol. 14, no. 3, pp. 541-570, 2021.
@article{hamdache_1579,
title = {Macroscopic limit of the kinetic Bloch equation},
author = {Kamel Hamdache and Djamila Hamroun},
url = {https://www.aimsciences.org/article/doi/10.3934/krm.2021015},
year = {2021},
date = {2021-06-01},
journal = {Kinetic And Related Models},
volume = {14},
number = {3},
pages = {541-570},
abstract = {This work concerns the existence of solution of the kinetic spinor Boltzmann equation as well as the asymptotic behavior of such solution when ??0, that is when the time relaxation of the spin-flip collisions is very small in comparison to the time relaxation parameter of the collisions with no spin reversal. Due to the lack of regularity of the weak solution, the switching term H?×M? is not stable under the weak convergences. Hence we establish new estimates of the so},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
