Modeling Group

@article{Oignet2017294,

title = {Rheological study of CO2 hydrate slurry in the presence of Sodium Dodecyl Sulfate in a secondary refrigeration loop},

author = {Jérémy Oignet and Anthony Delahaye and Jean-Philippe Torré and Christophe Dicharry and Hong Minh Hoang and Pascal Clain and Véronique Osswald and Ziad Youssef and Laurence Fournaison},

url = {http://www.sciencedirect.com/science/article/pii/S0009250916305486},

doi = {http://dx.doi.org/10.1016/j.ces.2016.10.018},

year  = {2016},

date = {2016-12-13},

journal = {Chemical Engineering Science},

volume = {158},

pages = {294 - 303},

abstract = {Abstract Secondary refrigeration and thermal energy storage are promising solutions to enhance the performance of refrigeration systems and reduce the impact of refrigerants on the environment. To improve the energy efficiency of secondary refrigeration loops, phase change material (PCM) slurries with a high energy density, such as CO2 hydrate slurries, can be used as a secondary refrigerant. In addition, hydrate-based processes could be an innovative option to capture CO2 from flue gas. In both applications, the rheological properties of the CO2 hydrate slurry have to be controlled. In the present study, CO2 hydrate slurry in the presence of Sodium Dodecyl Sulfate (SDS) was studied in a dynamic flow loop. The results show that SDS used at concentrations of 1500–2000 ppm significantly decreases agglomeration and improves the flow properties of the slurry. Moreover, SDS helps decrease the viscosity of the CO2-hydrate slurry at high fraction (>10 vol%) and therefore could be suitable for use in industrial applications such as secondary refrigeration, in which hydrate slurries must be easy to handle.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Hamdache2016e,

title = {Steady state solutions of ferrofluid flow models},

author = {Kamel Hamdache et Youcef Amirat},

editor = {Americain Institut of Mathematical Sciences},

doi = {doi: 10.3934/cpaa.2016039},

year  = {2016},

date = {2016-11-01},

journal = {Communications of Pure and Applied Analysis},

volume = {15},

number = {6},

pages = {2329-2356},

abstract = {We study two models of differential equations for the stationary flow of an incompressible viscous magnetic fluid subjected to an external magnetic field. The first model, called Rosensweig's model, consists of the incompressible Navier-Stokes equations, the angular momentum equation, the magnetization equation of Bloch-Torrey type, and the magnetostatic equations. The second one, called Shliomis model, is obtained by assuming that the angular momentum is given in terms of the magnetic field, the magnetization field and the vorticity. It consists of the incompressible Navier-Stokes equation, the magnetization equation and the magnetostatic equations. We prove, for each of the differential systems posed in a bounded domain of R3 and equipped with boundary conditions, existence of weak solutions by using regularization techniques, linearization and the Schauder fixed point theorem.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Guerard1,

title = {Demain, tous producteurs d'électricité ? },

author = {Guérard, Guillaume},

year  = {2016},

date = {2016-09-14},

journal = {The conversation, on line},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Guerard2,

title = {Par quoi passe l'efficacité énergétique ? },

author = {Guérard, Guillaume},

year  = {2016},

date = {2016-06-17},

journal = {The conversation, on line},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{IEEE2016,

title = {Influence of Biaxial Stress on Magnetic Behavior of Dual-Phase Steel --- Experiments and Modeling},

author = {Olivier Hubert and Frédérick Mballa-Mballa and Song He and Sophie Depeyre},

doi = {10.1109/TMAG.2015.2511169 },

issn = {0018-9464 },

year  = {2016},

date = {2016-01-05},

journal = {IEEE Transactions on Magnetics},

volume = {52},

number = {5},

abstract = {Online magnetic NDE of dual-phase (DP) steels is made on bands submitted to high multiaxial stress. Extraction of microstructural information from the measurement requires separating the effect of stress and microstructure. Coupled magnetomechanical micromagnetic modeling is relevant for that purpose. In this paper, the magnetic behavior of a DP steel under biaxial stress is carried out and compared with the modeling. It is shown that the discrepancies observed between experiments and model can be explained by the 2-D assumption. },

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Hamdache2016,

title = {Global existence and long time behavior of solutions to a model of ferroelectric materials},

author = {Kamel Hamdache and Djamila Hamroun},

editor = {Elsevier},

doi = {10.1016/j.jmaa.2016.01.074},

year  = {2016},

date = {2016-01-01},

journal = {Journal of Mathematical  Analysis and  Applications.},

volume = {438},

pages = {668-700},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{NME:NME5200,

title = {A multi-scale modeling method for heterogeneous structures without scale separation using a filter-based homogenization scheme},

author = {Tognevi Amen and Guerich Mohamed and Yvonnet Julien},

url = {http://dx.doi.org/10.1002/nme.5200},

doi = {10.1002/nme.5200},

issn = {1097-0207},

year  = {2016},

date = {2016-01-01},

journal = {International Journal for Numerical Methods in Engineering},

pages = {n/a--n/a},

abstract = {A method is proposed to compute the response of highly heterogeneous structures by constructing homogenized models when no scale separation can be assumed. The technique is based on an extended homogenization scheme where the averaging operators are replaced by linear filters to cut off fine scale fluctuations, while maintaining locally varying mechanical fields with larger wavelength. As a result, the constitutive law at an intermediate scale, called mesoscale, arises to be naturally nonlocal by construction, where the kernel operator is fully constructed by computations on the unit cell associated with the microstructure. A displacement-based numerical strategy is developed to implement the technique in a classical finite element framework and does not require higher-order elements. The methodology is applied to construct simplified models of heterogeneous structures subjected to loads, which have a characteristic wavelength comparable with the dimensions of the heterogeneities or in presence of strong strain localization as in cracked heterogeneous structures. Copyright © 2016 John Wiley & Sons, Ltd.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{doi:10.1061/(ASCE)EM.1943-7889.0001057,

title = {Determining the Size of RVE for Nonlinear Random Composites in an Incremental Computational Homogenization Framework},

author = {Trung Hieu Hoang and Mohamed Guerich and Julien Yvonnet},

url = {http://dx.doi.org/10.1061/(ASCE)EM.1943-7889.0001057},

doi = {10.1061/(ASCE)EM.1943-7889.0001057},

year  = {2016},

date = {2016-01-01},

journal = {Journal of Engineering Mechanics},

volume = {142},

number = {5},

pages = {04016018},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{CNDFLD14,

title = {Particle size distribution of TBPB hydrates by focused beam reflectance measurement (FBRM) for secondary refrigeration application},

author = { Pascal Clain and Fatou-Toutie Ndoye and Anthony Delahaye and Laurence Fournaison and Wei Lin and Didier Dalmazzone},

url = {http://labs.esilv.fr/publications/public/2014/CNDFLD14},

year  = {2015},

date = {2015-01-01},

journal = {International Journal of Refrigeration},

volume = {50},

pages = {19-31},

abstract = {The present work investigates TBPB(tetra-n-butylphosphonium bromide) hydrate slurries based on focused beam reflectance measurement (FBRM) method. Hydrates can be used as phase change materials (PCM) for thermal energy storage due to their high latent heat of melting. In this study, hydrates were formed from TBPB-water mixtures, suitable for air-conditioning applications. Moreover, hydrate slurries, composed of hydrate-particles dispersed in liquid, are appropriate solutions for cold distribution. Nevertheless, flow properties of hydrate slurries, depending on hydrate crystallization kinetics, must be controlled. In this work, FBRM was used for analysing TBPB-hydrate-particle size distribution. This work showed that FBRM can detect system phase changes (nucleation, growth, agglomeration). In addition, a bimodal distribution of particles was observed. This work could be useful to understand rheological behaviour of hydrate slurry, not only for secondary refrigeration applications, but also for natural gas hydrate transportation, pipeline plugging prevention, and gas capture.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{rad,

title = {Numerical analysis of the nonlinear Schrödinger equation with white noise dispersion},

author = { Radoin Belaouar and Anne de Bouard and Arnaud Debussche},

url = {http://dx.doi.org/10.1007/s40072-015-0044-z},

doi = {10.1007/s40072-015-0044-z},

issn = {2194-0401},

year  = {2015},

date = {2015-01-01},

journal = {Stochastic Partial Differential Equations: Analysis and Computations},

volume = {3},

number = {1},

pages = {103-132},

publisher = {Springer US},

abstract = {This article is devoted to the numerical study of a nonlinear Schrödinger equation in which the coefficient in front of the group velocity dispersion is multiplied by a real valued Gaussian white noise. We first perform the numerical analysis of a semi-discrete Crank-Nicolson scheme in the case when the continuous equation possesses a unique global solution. We prove that the strong order of convergence in probability is equal to one in this case. In a second step, we numerically investigate, in space dimension one, the behavior of the solutions of the equation for different power nonlinearities, corresponding to subcritical, critical or supercritical nonlinearities in the deterministic case. Numerical evidence of a change in the critical power due to the presence of the noise is pointed out.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Hamdache65,

title = {A reduced model for the polarization in a ferroelectric thin wire},

author = {Antonio Gaudiello and Kamel Hamdache },

editor = {Springer Basel},

doi = {DOI 10.1007/s00030-015-0348-8},

year  = {2015},

date = {2015-01-01},

journal = {Nonlinear Differential Equations and Applications (NoDEA )},

volume = {22},

number = {6},

pages = {1883-1896},

abstract = {In this paper, starting from a non-convex and nonlocal 3D-variational model for the electric polarization in a ferroelectric material, via an asymptotic process we obtain a rigorous 1D-variational model for a thin wire.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Bouabdallah2014c,

title = {Improved Numerical Integration for Locking Treatment in Isogeometric Structural Elements. Part I: Beams},

author = { Cédric Adam and Salim Bouabdallah and Malek Zarroug and Habibou Maitournam},

year  = {2014},

date = {2014-09-01},

journal = {Computer Methods in Applied Mechanics & Engineering},

volume = {279},

pages = {1-28},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{LCDFDF14,

title = {Thermodynamic properties of semiclathrate hydrates formed from the TBAB+TBPB+water and CO2+TBAB+TBPB+water systems},

author = { Wei Lin and Pascal Clain and Didier Dalmazzone and Walter Fürst and Anthony Delahaye and Laurence Fournaison},

url = {http://labs.esilv.fr/publications/public/2014/LCDFDF14},

year  = {2014},

date = {2014-01-01},

journal = {Fluid Phase Equilibria},

volume = {372},

pages = {63--68},

abstract = {Semiclathrate hydrates formed from binary systems of tetra-n-butylammonium bromide (TBAB) + water and tetra-n-butylphosphonium bromide (TBPB) + water have been investigated for their promising application in the refrigeration system. In the present work, semiclathrate hydrates in the ternary system of TBAB + TBPB + water were studied for the first time, in the presence and absence of CO2 pressure. Using DSC technique, the dissociation temperatures of semiclathrate hydrates were determined at the mass fraction of salt mixture ranges from 0.05 to 0.60 with variable composition from pure TBAB to pure TBPB. At any salt concentration tested, the dissociation temperature of semiclathrate hydrates increased regularly with TBAB composition increase. Applying CO2 pressure in the TBAB + TBPB + water system resulted in further increase of dissociation temperature due to the gas enclathration in the mixed hydrate structure. The phase transition enthalpy of semiclathrate hydrates were investigated at wsalts = 0.40 and variable TBPB compositions, without CO2 and with p CO 2 = 1.0 ? MPa . It was found that the dissociation enthalpies of CO2-free and CO2-containing semiclathrate hydrates are almost independent of the TBPB salt composition. From our current results, TBAB + TBPB + CO2 hydrates appear as valuable phase change materials to be used as hydrate slurries for cold storage and transportation in applications requiring variable working temperatures.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Mballa_IEEE,

title = {Micromagnetic Modeling of Magneto-Mechanical Behavior},

author = {Frédérick Mballa-Mballa and Olivier Hubert and Song He and Sophie Depeyre and Philip Meilland},

url = {http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=6798024},

doi = {10.1109/TMAG.2013.2288911},

issn = {0018-9464},

year  = {2014},

date = {2014-01-01},

journal = {IEEE Transactions on Magnetics},

volume = {50},

number = {4},

pages = {1--4},

publisher = {IEEE},

abstract = {A magneto-mechanical static modeling of ferromagnetic particle based on minimization of an energy function is presented. This modeling is made of a conjugate gradient method coupled with finite-element method for the mechanical problem resolution. Two-dimensional computational results highlighting the influence of magneto-mechanical coupling on the magnetic microstructure and behavior are reported.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wang_Superconduc,

title = {Reversible magnetomechanical modeling of heterogeneous media},

author = {Xingjun Wang and Olivier Hubert and Song HE and Frédérick MBALLA-MBALLA and Ying HUANG},

doi = {10.1007/s10948-014-2536-x},

issn = {1557-1939},

year  = {2014},

date = {2014-01-01},

journal = {Journal Superconduc Novel Magnetism},

volume = {27},

number = {9},

pages = {2049--2058},

publisher = {Springer US},

abstract = {Localization and homogenization of the magnetomechanical fields in heterogeneous media are discussed. The magnetoelastic modeling for magnetic polycrystals is extended from the description of the singlecrystal modeling. This model is then applied to the prediction of the behavior of dual-phase steels. Each phase can be considered as a sphere embedded in a homogeneous equivalent medium. The magnetic model used for each phase is an explicit single-crystalline model representative of the behavior of the corresponding phase. Homogenization rules allow the simulation of the average medium. Experiments are carried out and compared to the numerical results.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Malapaka2013,

title = {Unconditionally stable numerical simulations of a new generalized reduced resistive magnetohydrodynamics model},

author = { Shiva Kumar Malapaka and Bruno Després and Rémy Sart},

url = {http://onlinelibrary.wiley.com/doi/10.1002/fld.3847/abstract},

year  = {2013},

date = {2013-10-10},

journal = {International Journal for Numerical Methods in Fluids},

volume = {74},

number = {4},

pages = {231-249},

abstract = {Reduced-resistive magnetohydrodynamics (MHD) models are used in understanding different phenomenon in various domains, for example, astrophysics to model magnetotail or for solar arcades [Finn Bozkaya JM, Guzdar PN. Loss of equilibrium and reconnection in tearing of two dimensional equilibrias. Physics of Fluids B 1993; 5:2870–2876], modeling plasma confinements in reverse field pinch [Strauss HR. The dynamo effect in fusion plasmas. Physics of Fluids 1985; 28:2786–2792] and tokamaks [Strauss HR. Reduced MHD in nearly potential magnetic fields. Journal of Plasma Physics 1997; 57(1):83–87; Freidberg J. Plasma Physics and Fusion Energy. Cambridge University Press: Cambridge, 2008]. In this context, recently, a new generalized reduced-resistive MHD model, which can make use of an arbitrary density profile was proposed [Després B, Sart R. Reduced resistive MHD in Tokamaks with general density. ESAIM: Mathematical Modelling and Numerical Analysis 2012; 46(5):1081–1106. EDP Sciences, SMAI, 2012 online 2011]. We in this work show that this proposed theoretical model can be realized numerically as well, and that it is very robust if the equation set is written in a very particular form using the properties of FEM. To illustrate these points, we pick the current hole configuration [Fujita T, Oikawa T, Suzuki?T, Ide S, Sakamoto Y, Koide Y, Hatae T, Naito O, Isayama A, Hayashi N, Shirai H. Plasma equilibrium and confinement in a tokamak with nearly zero central current density in JT-60U. Physical Review Letters 2001; 87(11):245001; Hawkes NC, Stratton BC, Tala T, Challis CD, Conway G, DeAngelis R, Giroud C, Hobirk J, Joffrin E, Lomas P, Lotte P, Mailloux J, Mazon D, Rachlew E, Reyes-Cortes S, Solano E, Zastrow K-D. Observation of zero current density in the core of JET discharges with lower hybrid heating and current drive. Physical Review Letters 2001; 87(11):115001], which was modeled using reduced-resistive MHD and remodel it using different combinations of current sources and density profiles. Our model can be implemented with reasonable computational resources at the price of solving a well-posed global linear system and it is unconditionally stable. These features are also demonstrated as a part of our numerical experiments. Copyright © 2013 John Wiley & Sons, Ltd.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{GUERICH2013,

title = {Optimization of Noise Transmission through Damped Sandwich Structures},

author = { Mohamed Guerich and Samir Assaf},

url = {http://www.researchgate.net/publication/262456008_Optimization_of_Noise_Transmission_through_Damped_Sandwich_Structures},

year  = {2013},

date = {2013-10-01},

journal = {Journal of Vibration and Acoustics},

volume = {135},

number = {5},

pages = {1-13},

abstract = {An optimization methodology to increase the noise transmission loss (TL) of damped sandwich structures is presented. The prediction of the TL uses a numerical tool based on a finite element formulation for the sandwich plate coupled to a boundary element method for the acoustic medium. This tool can be used for arbitrarily shaped three-layer sandwich plates with various boundary conditions and it is well adapted to parametric and optimization studies. First, a parametric study was conducted to choose the objective function, the constraints, and the pertinent design variables to use in the optimization problem which consist in reducing the sound power transmitted by a viscoelastically damped sandwich plate. Next, by constraining the acoustical behavior of the sandwich panel, the surface mass of the sandwich structure was minimized. It is shown that a significant reduction in the transmitted sound power can be achieved by selecting the appropriate geometric configuration and damping layer material.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}