The professors and researchers of the Modeling Group
Publications of the professors and researchers of the Modeling Group
2016 |
Oignet, Jérémy; Delahaye, Anthony; Torré, Jean-Philippe; Dicharry, Christophe; Hoang, Hong Minh; Clain, Pascal; Osswald, Véronique; Youssef, Ziad; Fournaison, Laurence Rheological study of CO2 hydrate slurry in the presence of Sodium Dodecyl Sulfate in a secondary refrigeration loop Journal Article Chemical Engineering Science, 158 , pp. 294 - 303, 2016. @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} } 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. |
Guérard, Guillaume Demain, tous producteurs d'électricité ? Journal Article The conversation, on line, 2016. @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} } |
Achraf Kallel Menad Lamraoui, Joseph Fitoussi ; Tcharkhtchi, Abbas The residual stress effect on the Shape Memory Polymers Conference ICRS-10, 2016. @conference{ICRS-10, title = {The residual stress effect on the Shape Memory Polymers }, author = {Achraf Kallel, Menad Lamraoui, Joseph Fitoussi AND Abbas Tcharkhtchi}, editor = {10 th International Conference on Residual Stresses, Sydney, Australia}, year = {2016}, date = {2016-07-01}, booktitle = {ICRS-10}, abstract = {The current paper presents an experimental study of the residual stress role to recover polymer blend to its original position after deformation. A mixture of 40% PolyCaproLactone (PCL) and 60% Styrene-Butadiene-Styrene (SBS) is used for our study. The Shape Memory Polymer (SMP) is able to storing a permanent macroscopic after passing through a temporary one; then under an external stimulus; they can recover their initial shapes. The recovery rate depends not only on the mechanical property of the mixture, but also the number of the loading cycles. Indeed, one multiplying the number of mechanical loading cycle; generally tensile test; the recovery rate does not change in a linear manner and therefore the residual stress is not added in integer from one cycle to another. In this work we studied the mechanism of the shape as well as properties memory effect of the blend under study during a shape memory cycle, to establish a relationship between the “shape memory effect” and the “properties memory effect”. Finally, we measure the “Driving Force” responsible for the shape memory effect by an original method. This study allows establishing a relationship between the rate of recovery and residual stresses introduced into the polymer during its deformation. }, keywords = {}, pubstate = {published}, tppubtype = {conference} } The current paper presents an experimental study of the residual stress role to recover polymer blend to its original position after deformation. A mixture of 40% PolyCaproLactone (PCL) and 60% Styrene-Butadiene-Styrene (SBS) is used for our study. The Shape Memory Polymer (SMP) is able to storing a permanent macroscopic after passing through a temporary one; then under an external stimulus; they can recover their initial shapes. The recovery rate depends not only on the mechanical property of the mixture, but also the number of the loading cycles. Indeed, one multiplying the number of mechanical loading cycle; generally tensile test; the recovery rate does not change in a linear manner and therefore the residual stress is not added in integer from one cycle to another. In this work we studied the mechanism of the shape as well as properties memory effect of the blend under study during a shape memory cycle, to establish a relationship between the “shape memory effect” and the “properties memory effect”. Finally, we measure the “Driving Force” responsible for the shape memory effect by an original method. This study allows establishing a relationship between the rate of recovery and residual stresses introduced into the polymer during its deformation. |
Guérard, Guillaume Par quoi passe l'efficacité énergétique ? Journal Article The conversation, on line, 2016. @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} } |
Hamdache, Kamel; Hamroun, Djemila; Louardani, Asma Global weak solutions to a model of micropolar fluids with maxwell-cattaneo heat transfer law. Nonlinear Analysis Journal Article Nonlinear Analysis, (142), pp. 69-96, 2016. @article{HamdacheHamrounLouardani, title = {Global weak solutions to a model of micropolar fluids with maxwell-cattaneo heat transfer law. Nonlinear Analysis}, author = {Kamel Hamdache and Djemila Hamroun and Asma Louardani}, year = {2016}, date = {2016-06-16}, journal = {Nonlinear Analysis}, number = {142}, pages = {69-96}, abstract = {This work is devoted to the study of a system describing the dynamics of a heated micropolar fluid under the action of an applied magnetic field. The heat transfer is subjected to Maxwell–Cattaneo law instead of the usual Fourier law. Thanks to regularization and compactness methods the global existence in time of weak solutions with finite energy has been proved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This work is devoted to the study of a system describing the dynamics of a heated micropolar fluid under the action of an applied magnetic field. The heat transfer is subjected to Maxwell–Cattaneo law instead of the usual Fourier law. Thanks to regularization and compactness methods the global existence in time of weak solutions with finite energy has been proved. |
T.H., Hoang; M., Guerich; J., Yvonnet A Numerical Incremental Homogenization Approach to Calculate Elastoplastic Heterogeneous Structures Inproceedings European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016), Crète, 2016. @inproceedings{Guerichconf2016, title = {A Numerical Incremental Homogenization Approach to Calculate Elastoplastic Heterogeneous Structures}, author = {Hoang T.H. and Guerich M. and Yvonnet J. }, year = {2016}, date = {2016-06-06}, booktitle = {European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016), Crète}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
A., Tognevi; M., Guerich; J., Yvonnet A multi-scale modeling method for heterogeneous structures without scale separation using a filterbased homogenization scheme Inproceedings European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016), June 5-10, 2016, Crète, Grèce., 2016. @inproceedings{Guerichconf22016, title = {A multi-scale modeling method for heterogeneous structures without scale separation using a filterbased homogenization scheme}, author = {Tognevi A. and Guerich M. and Yvonnet J. }, year = {2016}, date = {2016-06-06}, booktitle = {European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016), June 5-10, 2016, Crète, Grèce.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Hamdache, Kamel; Gaudellio, A Ferroelectric thin structures. Conference New Trends in Differential Equations, Control Theory and Optimisation. Edt. V. Barby, C. Lefter, I. Vrabie. World Scientific (2016) 121-127, 2016. @conference{HamdacheGauconf2016, title = {Ferroelectric thin structures.}, author = {Kamel Hamdache and A. Gaudellio}, year = {2016}, date = {2016-03-09}, booktitle = {New Trends in Differential Equations, Control Theory and Optimisation. Edt. V. Barby, C. Lefter, I. Vrabie. World Scientific (2016) 121-127}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Hubert, Olivier; Mballa-Mballa, Frédérick; He, Song; Depeyre, Sophie Influence of Biaxial Stress on Magnetic Behavior of Dual-Phase Steel --- Experiments and Modeling Journal Article IEEE Transactions on Magnetics, 52 (5), 2016, ISSN: 0018-9464 . @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} } 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. |
Hamdache, Kamel; Hamroun, Djamila Global existence and long time behavior of solutions to a model of ferroelectric materials Journal Article Journal of Mathematical Analysis and Applications., 438 , pp. 668-700, 2016. @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} } |
Hamdache, Kamel; Hamroun, Djamila; Aggoune, Fatah FNM Fédération Normandie Mathématiques Actes du colloque Edp-Normandie Le Havre 2015, Le Havre, 2016. @proceedings{Hamdache2016b, title = {Transfert de chaleur dans un fluide magnétique avec la loi de Maxwell-Cattaneo non linéaire.Équations aux dérivées partielles et leurs applications.}, author = {Kamel Hamdache and Djamila Hamroun and Fatah Aggoune}, year = {2016}, date = {2016-01-01}, publisher = {Actes du colloque Edp-Normandie Le Havre 2015}, address = {Le Havre}, organization = {FNM Fédération Normandie Mathématiques}, keywords = {}, pubstate = {published}, tppubtype = {proceedings} } |
Amen, Tognevi; Mohamed, Guerich; Julien, Yvonnet A multi-scale modeling method for heterogeneous structures without scale separation using a filter-based homogenization scheme Journal Article International Journal for Numerical Methods in Engineering, pp. n/a–n/a, 2016, ISSN: 1097-0207. @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} } 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. |
Hoang, Trung Hieu; Guerich, Mohamed; Yvonnet, Julien Determining the Size of RVE for Nonlinear Random Composites in an Incremental Computational Homogenization Framework Journal Article Journal of Engineering Mechanics, 142 (5), pp. 04016018, 2016. @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} } |
2015 |
Benlazreg, Bassem; Kallel, Achraf; Massol, Alexis Optimized design for 3D printing Conference The 8th European Altair Technology Conference, ATC2015, October1, Paris, France, 2015. @conference{ATC2015, title = {Optimized design for 3D printing}, author = {Bassem Benlazreg and Achraf Kallel and Alexis Massol}, year = {2015}, date = {2015-10-01}, booktitle = {The 8th European Altair Technology Conference, ATC2015, October1, Paris, France}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Oignet, Jérémy; Delahaye, Anthony; Dufour, Thomas; Hoang, Hong-Minh; Clain, Pascal; Fournaison, Laurence Energy study of CO2 hydrate slurries formation in a tank reactor Inproceedings 24rd IIR International Congress of Refrigeration (ICR 2015), Aug 16-22 Yokohama, Japan, 2015. @inproceedings{Oignet2015, title = {Energy study of CO2 hydrate slurries formation in a tank reactor}, author = {Jérémy Oignet and Anthony Delahaye and Thomas Dufour and Hong-Minh Hoang and Pascal Clain and Laurence Fournaison}, year = {2015}, date = {2015-08-16}, booktitle = {24rd IIR International Congress of Refrigeration (ICR 2015)}, address = {Yokohama, Japan}, organization = {Aug 16-22}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Clain, Pascal; Osswald, Véronique; Spiga, Olivier; Delahaye, Anthony; Fournaison, Laurence A new formation kinetics study method of TBPB and CO2 hydrates based on DTA Inproceedings 24rd IIR International Congress of Refrigeration (ICR 2015), Aug 16-22 Yokohama, Japan, 2015. @inproceedings{Clain2015, title = {A new formation kinetics study method of TBPB and CO2 hydrates based on DTA}, author = {Pascal Clain and Véronique Osswald and Olivier Spiga and Anthony Delahaye and Laurence Fournaison}, year = {2015}, date = {2015-08-16}, booktitle = {24rd IIR International Congress of Refrigeration (ICR 2015)}, address = {Yokohama, Japan}, organization = {Aug 16-22}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Hoang, Trung Hieu; Guerich, Mohamed; Yvonnet, Julien Effective size of RVE for finite element analysis of structures made of nonlinear random composites Inproceedings 18th International Conference on Composite Structures (ICCS18), Lisbonne, Portugal, 2015. @inproceedings{hoang:hal-01166513, title = {Effective size of RVE for finite element analysis of structures made of nonlinear random composites}, author = { Trung Hieu Hoang and Mohamed Guerich and Julien Yvonnet}, url = {https://hal-upec-upem.archives-ouvertes.fr/hal-01166513}, year = {2015}, date = {2015-06-01}, booktitle = {18th International Conference on Composite Structures (ICCS18)}, address = {Lisbonne, Portugal}, abstract = {In the present work, we propose to determine the size of a representative volume element (RVE) in the case of nonlinear random composites with either elastoplastic or elasto viscoplastic phases. In such a case, the general form of the effective constitutive behavior is not known in advance and the response must be evaluated either by direct numerical computations on the RVE, either by an appropriate approximation scheme. Previous methodologies [1,2] for determining the size of RVE usually rely on analyzing the convergence of the RVE response computed numerically with respect to its size. In the present work, we analyze the convergence of parameters related to an incremental homogenization scheme, with respect to (i) the size of the RVE and (ii) to statistical convergence related to microstructure realizations. For that purpose, we combine an incremental homogenization method [3] with a statistical convergence analysis of parameters related to the matrix phase only. The advantage is that the range of parameters to be identified is much narrower than for a general empirical constitutive law. Once identified and the convergence analysis performed with respect to both size of RVE and statistical realizations, the macroscopic constitutive law can be readily used for structure calculations. We illustrate the methodology by analyzing two-dimensional microstructures with randomly distributed cylindrical elastic rigid fibers, embedded in a elastoplastic or elasto-viscoplastic matrix. For these materials, the existence of an RVE is demonstrated for sizes of RVE corresponding to 17 − 18 and 14 − 15 times the diameter of the inclusions, respectively. Effective size of RVE for finite element analysis of structures made of nonlinear random composites - ResearchGate. Available from: http://www.researchgate.net/publication/279488878_Effective_size_of_RVE_for_finite_element_analysis_of_structures_made_of_nonlinear_random_composites [accessed Jul 24, 2015].}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } In the present work, we propose to determine the size of a representative volume element (RVE) in the case of nonlinear random composites with either elastoplastic or elasto viscoplastic phases. In such a case, the general form of the effective constitutive behavior is not known in advance and the response must be evaluated either by direct numerical computations on the RVE, either by an appropriate approximation scheme. Previous methodologies [1,2] for determining the size of RVE usually rely on analyzing the convergence of the RVE response computed numerically with respect to its size. In the present work, we analyze the convergence of parameters related to an incremental homogenization scheme, with respect to (i) the size of the RVE and (ii) to statistical convergence related to microstructure realizations. For that purpose, we combine an incremental homogenization method [3] with a statistical convergence analysis of parameters related to the matrix phase only. The advantage is that the range of parameters to be identified is much narrower than for a general empirical constitutive law. Once identified and the convergence analysis performed with respect to both size of RVE and statistical realizations, the macroscopic constitutive law can be readily used for structure calculations. We illustrate the methodology by analyzing two-dimensional microstructures with randomly distributed cylindrical elastic rigid fibers, embedded in a elastoplastic or elasto-viscoplastic matrix. For these materials, the existence of an RVE is demonstrated for sizes of RVE corresponding to 17 − 18 and 14 − 15 times the diameter of the inclusions, respectively. Effective size of RVE for finite element analysis of structures made of nonlinear random composites - ResearchGate. Available from: http://www.researchgate.net/publication/279488878_Effective_size_of_RVE_for_finite_element_analysis_of_structures_made_of_nonlinear_random_composites [accessed Jul 24, 2015]. |
Hoang, Trung Hieu; Guerich, Mohamed; Yvonnet, Julien An incremental multilevel computational homogenization method for elastoplastic composites Inproceedings 18th International Conference on Composite Structures (ICCS18), Lisbonne, Portugal, 2015. @inproceedings{hoang:hal-01166485, title = {An incremental multilevel computational homogenization method for elastoplastic composites}, author = {Trung Hieu Hoang and Mohamed Guerich and Julien Yvonnet}, url = {https://hal-upec-upem.archives-ouvertes.fr/hal-01166485}, year = {2015}, date = {2015-06-01}, booktitle = {18th International Conference on Composite Structures (ICCS18)}, address = {Lisbonne, Portugal}, abstract = {In the present work, a multilevel computational homogenization method is proposed for solving structure problems made of elastoplastic phases. To reduce computations costs of classical multi- level finite element methods [2], we use an incremental framework, initiated in Hill citehill1965 and developed for semi-analytical method e.g. in [1]. In semi-analytical approaches, the approx- imation of the Mori-Tanaka scheme induces limitations in accuracy for some configurations like strongly anisotropic microstructures and does not allow capturing effective smooth hardening in- duced by the different elastoplastic phases. In the proposed method, we use the incremental ap- proach by computing directly the effective macroscopic tensor related to the linearized problem numerically by Finite Elements on an RVE. The method is validated through an example of ho- mogenization of a composite microstructure with elastic rigid fibers, embedded in an elastoplastic matrix. The results showed that the method is more accurate than semi-anlytical methods and is less computationally demanding than FE2. An incremental multilevel computational homogenization method for elastoplastic composites - }, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } In the present work, a multilevel computational homogenization method is proposed for solving structure problems made of elastoplastic phases. To reduce computations costs of classical multi- level finite element methods [2], we use an incremental framework, initiated in Hill citehill1965 and developed for semi-analytical method e.g. in [1]. In semi-analytical approaches, the approx- imation of the Mori-Tanaka scheme induces limitations in accuracy for some configurations like strongly anisotropic microstructures and does not allow capturing effective smooth hardening in- duced by the different elastoplastic phases. In the proposed method, we use the incremental ap- proach by computing directly the effective macroscopic tensor related to the linearized problem numerically by Finite Elements on an RVE. The method is validated through an example of ho- mogenization of a composite microstructure with elastic rigid fibers, embedded in an elastoplastic matrix. The results showed that the method is more accurate than semi-anlytical methods and is less computationally demanding than FE2. An incremental multilevel computational homogenization method for elastoplastic composites - |
Clain, Pascal; Ndoye, Fatou-Toutie; Delahaye, Anthony; Fournaison, Laurence; Lin, Wei; Dalmazzone, Didier Particle size distribution of TBPB hydrates by focused beam reflectance measurement (FBRM) for secondary refrigeration application Journal Article International Journal of Refrigeration, 50 , pp. 19-31, 2015. @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} } 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. |
Belaouar, Radoin; de Bouard, Anne; Debussche, Arnaud Numerical analysis of the nonlinear Schrödinger equation with white noise dispersion Journal Article Stochastic Partial Differential Equations: Analysis and Computations, 3 (1), pp. 103-132, 2015, ISSN: 2194-0401. @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} } 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. |
Gaudiello, Antonio; Hamdache, Kamel A reduced model for the polarization in a ferroelectric thin wire Journal Article Nonlinear Differential Equations and Applications NoDEA, 22 (6,22), pp. 1883-1896, 2015. @article{Gaudiello2015, title = {A reduced model for the polarization in a ferroelectric thin wire}, author = {Antonio Gaudiello and Kamel Hamdache}, year = {2015}, date = {2015-01-01}, journal = {Nonlinear Differential Equations and Applications NoDEA}, volume = {22}, number = {6,22}, pages = {1883-1896}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yvonnet, Julien; Tognevi, A; Bonnet, Guy; Guerich, M A filter-based computational homogenization method for handling non-separated scales problems Inproceedings 12e Colloque National en Calcul des Structures, Presqu’^ile de Giens, France, 2015. @inproceedings{yvonnet:hal-01166483b, title = {A filter-based computational homogenization method for handling non-separated scales problems}, author = { Julien Yvonnet and A. Tognevi and Guy Bonnet and M. Guerich}, url = {https://hal-upec-upem.archives-ouvertes.fr/hal-01166483}, year = {2015}, date = {2015-01-01}, booktitle = {12e Colloque National en Calcul des Structures}, address = {Presqu’^ile de Giens, France}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Yvonnet, Julien; Bonnet, Guy; Tognevi, A; Guerich, M Filter-based computational homogenization Inproceedings 1st Pan-American congress on computational mechanics, Buenos Aires, Argentina, 2015, (Conf'erence invit'ee). @inproceedings{yvonnet:hal-01147886, title = {Filter-based computational homogenization}, author = { Julien Yvonnet and Guy Bonnet and A. Tognevi and M. Guerich}, url = {https://hal-upec-upem.archives-ouvertes.fr/hal-01147886}, year = {2015}, date = {2015-01-01}, booktitle = {1st Pan-American congress on computational mechanics}, address = {Buenos Aires, Argentina}, note = {Conf'erence invit'ee}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Yvonnet, Julien; Tognevi, A; Bonnet, Guy; Guerich, M A filter-based computational homogenization method for handling non-separated scales problems Inproceedings 12e Colloque National en Calcul des Structures, Presqu’^ile de Giens, France, 2015. @inproceedings{yvonnet:hal-01166483, title = {A filter-based computational homogenization method for handling non-separated scales problems}, author = { Julien Yvonnet and A. Tognevi and Guy Bonnet and M. Guerich}, url = {https://hal-upec-upem.archives-ouvertes.fr/hal-01166483}, year = {2015}, date = {2015-01-01}, booktitle = {12e Colloque National en Calcul des Structures}, address = {Presqu’^ile de Giens, France}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
2014 |
Adam, Cédric; Bouabdallah, Salim; Zarroug, Malek; Maitournam, Habibou Improved Numerical Integration for Locking Treatment in Isogeometric Structural Elements. Part I: Beams Journal Article Computer Methods in Applied Mechanics & Engineering, 279 , pp. 1-28, 2014. @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} } |
Hoang, Trung Hieu; Guerich, Mohamed; Yvonnet, Julien 11th. World Congress on Computational Mechanics (WCCM XI), Barcelona, SPAIN, 2014. @proceedings{HOANG2014b, title = {A decoupled approach for computing the response of structures made of heterogeneous, random elastoplactic composites with hardening}, author = { Trung Hieu Hoang and Mohamed Guerich and Julien Yvonnet}, url = {http://www.esilv.fr/ecole-ingenieur/wp-content/uploads/2014/07/a1303.pdf}, year = {2014}, date = {2014-07-25}, publisher = {11th. World Congress on Computational Mechanics (WCCM XI)}, address = {Barcelona, SPAIN}, abstract = {A decoupled approach for computing the response of structures made of heterogeneous, random elastoplactic composites with hardening}, keywords = {}, pubstate = {published}, tppubtype = {proceedings} } A decoupled approach for computing the response of structures made of heterogeneous, random elastoplactic composites with hardening |
Lakhssassi, Morad; Bouabdallah, Salim Typology analysis for the optimization of a stamping process Conference 11th World Congress on Computational Mechanics (WCCM XI), Barcelona, 2014. @conference{Bouabdallah2014, title = {Typology analysis for the optimization of a stamping process}, author = { Morad Lakhssassi and Salim Bouabdallah}, year = {2014}, date = {2014-07-20}, publisher = {11th World Congress on Computational Mechanics (WCCM XI), Barcelona}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Tognevi, Amen; Guerich, Mohamed; Yvonnet, Julien 11th. World Congress on Computational Mechanics (WCCM XI), Barcelona, SPAIN, 2014. @proceedings{atognevi2014b, title = {Computational modelling of heterogeneous structures without scale separation: an approach based on nonlocal filter-based homogenization}, author = { Amen Tognevi and Mohamed Guerich and Julien Yvonnet}, url = {http://www.esilv.fr/ecole-ingenieur/wp-content/uploads/2014/07/a3013.pdf}, year = {2014}, date = {2014-07-20}, publisher = {11th. World Congress on Computational Mechanics (WCCM XI)}, address = {Barcelona, SPAIN}, keywords = {}, pubstate = {published}, tppubtype = {proceedings} } |
Hoang, Trung Hieu; Guerich, Mohamed; Yvonnet, Julien Stony Brook University Mechanics of Composites 2014 (MECHCOMP2014), June 8 - 12, 2014, USA, 2014. @proceedings{HOANG2014, title = {A procedure to determine the size of RVE nonlinear random heterogeneous material based on an incremental homogenization method}, author = { Trung Hieu Hoang and Mohamed Guerich and Julien Yvonnet}, year = {2014}, date = {2014-06-08}, publisher = {Mechanics of Composites 2014 (MECHCOMP2014), June 8 - 12, 2014}, address = {USA}, organization = {Stony Brook University}, keywords = {}, pubstate = {published}, tppubtype = {proceedings} } |
Adam, Cédric; Bouabdallah, Salim; Zarroug, Malek; Maitournam, Habibou Numerical integration for locking treatment in isogeometric structural elements Conference Isogeometric Analysis Applications (IGAAA 2014), Annweiler Am Trifels, Germany, 2014. @conference{Bouabdallah2014b, title = {Numerical integration for locking treatment in isogeometric structural elements}, author = { Cédric Adam and Salim Bouabdallah and Malek Zarroug and Habibou Maitournam}, year = {2014}, date = {2014-04-07}, publisher = {Isogeometric Analysis Applications (IGAAA 2014), Annweiler Am Trifels, Germany}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Clain, Pascal Couplage entre le stockage et la distribution de froid par coulis d hydrates PhD Thesis Université Pierre et Marie Curie, 2014. @phdthesis{Cla14, title = {Couplage entre le stockage et la distribution de froid par coulis d hydrates}, author = { Pascal Clain}, url = {http://labs.esilv.fr/publications/public/2014/Cla14}, year = {2014}, date = {2014-01-01}, school = {Université Pierre et Marie Curie}, abstract = {The use of hydrate slurries as two-phase secondary refrigerants (FFD) reduces the environmental impact of refrigeration systems because these fluids have a high energy density. They can be used for cold storage will be a solution at an industrial problem of cold distribution at various temperature levels (air-conditioning, cooling process or preservation temperature). In this work, we study the coupling between a storage device and a cold distribution system by hydrate slurries. For achieve this objective, a two-stage reactor has been built for simulate the process. Equilibrium conditions studies for single and mixed hydrate showed an equilibrium temperature shift in porous media without deterioration of latent heat fusion. Hydrates formation/dissociation kinetics have been studied according to crystallization classical theories and an empirical model was obtained. Rheological studies of hydrate slurries emphasized a shear-thinning behavior for both, but a high propensity for agglomeration for mixed hydrate slurry. Particle size analysis showed the slurry has bimodal crystals distribution. Experimental set-up characterization showed process parameters effect in induction time. A 2D numerical tool integrating various empirical relations was developed for modelling temperature profile in the reactor and was validated in a first approach}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } The use of hydrate slurries as two-phase secondary refrigerants (FFD) reduces the environmental impact of refrigeration systems because these fluids have a high energy density. They can be used for cold storage will be a solution at an industrial problem of cold distribution at various temperature levels (air-conditioning, cooling process or preservation temperature). In this work, we study the coupling between a storage device and a cold distribution system by hydrate slurries. For achieve this objective, a two-stage reactor has been built for simulate the process. Equilibrium conditions studies for single and mixed hydrate showed an equilibrium temperature shift in porous media without deterioration of latent heat fusion. Hydrates formation/dissociation kinetics have been studied according to crystallization classical theories and an empirical model was obtained. Rheological studies of hydrate slurries emphasized a shear-thinning behavior for both, but a high propensity for agglomeration for mixed hydrate slurry. Particle size analysis showed the slurry has bimodal crystals distribution. Experimental set-up characterization showed process parameters effect in induction time. A 2D numerical tool integrating various empirical relations was developed for modelling temperature profile in the reactor and was validated in a first approach |
Lin, Wei; Clain, Pascal; Dalmazzone, Didier; Fürst, Walter; Delahaye, Anthony; Fournaison, Laurence Thermodynamic properties of semiclathrate hydrates formed from the TBAB+TBPB+water and CO2+TBAB+TBPB+water systems Journal Article Fluid Phase Equilibria, 372 , pp. 63–68, 2014. @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} } 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. |
Belaouar, Radoin; Fahim, Arash; Touzi, Nizar Optimal Production Policy in Carbon Emission Marke (preprint) Unpublished 2014. @unpublished{carbon, title = {Optimal Production Policy in Carbon Emission Marke (preprint)}, author = { Radoin Belaouar and Arash Fahim and Nizar Touzi}, year = {2014}, date = {2014-01-01}, abstract = {The aim of this paper is to address the effect of the carbon emission allowance market on the production policy of a polluter production firm. We investigate this effect in three cases; when the firm is not a large polluter, when it has a large contribution in emission of carbon but can not affect the risk premium of the allowance market, and when it is a large contributor in the emission of carbon and can change the risk premium by its production. In our simple model, we ignore any possible investment of the firm in pollution reducing technologies. We formulate the problem of optimal production by a stochastic optimization problem. Then, we show that, as expected, the market reduces the optimal production policy in the first two cases. However, when the large producer activities can change the market risk premium, the cut on the production and consequently pollution cannot be guaranteed. In fact, our numerical test shows that for some models in our framework, the increase in production, and thus pollution, can increase the profit of the firm.}, keywords = {}, pubstate = {published}, tppubtype = {unpublished} } The aim of this paper is to address the effect of the carbon emission allowance market on the production policy of a polluter production firm. We investigate this effect in three cases; when the firm is not a large polluter, when it has a large contribution in emission of carbon but can not affect the risk premium of the allowance market, and when it is a large contributor in the emission of carbon and can change the risk premium by its production. In our simple model, we ignore any possible investment of the firm in pollution reducing technologies. We formulate the problem of optimal production by a stochastic optimization problem. Then, we show that, as expected, the market reduces the optimal production policy in the first two cases. However, when the large producer activities can change the market risk premium, the cut on the production and consequently pollution cannot be guaranteed. In fact, our numerical test shows that for some models in our framework, the increase in production, and thus pollution, can increase the profit of the firm. |
Mballa-Mballa, Frédérick; Hubert, Olivier; He, Song; Depeyre, Sophie; Meilland, Philip Micromagnetic Modeling of Magneto-Mechanical Behavior Journal Article IEEE Transactions on Magnetics, 50 (4), pp. 1–4, 2014, ISSN: 0018-9464. @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} } 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. |
Wang, Xingjun; Hubert, Olivier; HE, Song; MBALLA-MBALLA, Frédérick; HUANG, Ying Reversible magnetomechanical modeling of heterogeneous media Journal Article Journal Superconduc Novel Magnetism, 27 (9), pp. 2049–2058, 2014, ISSN: 1557-1939. @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} } 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. |
2013 |
Kallel, Achraf; Bouabdallah, Salim; Roelandt, Jean-Marc A review of different formulations for mortar contact constraint enforcement Conference 4° Congrès Algérien de Mécanique, Mascara, 2013. @conference{Bouabdallah2013, title = {A review of different formulations for mortar contact constraint enforcement}, author = { Achraf Kallel and Salim Bouabdallah and Jean-Marc Roelandt}, year = {2013}, date = {2013-11-25}, publisher = {4° Congrès Algérien de Mécanique, Mascara}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Malapaka, Shiva Kumar; Després, Bruno; Sart, Rémy Unconditionally stable numerical simulations of a new generalized reduced resistive magnetohydrodynamics model Journal Article International Journal for Numerical Methods in Fluids, 74 (4), pp. 231-249, 2013. @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} } 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. |
Guerich, Mohamed; Assaf, Samir Optimization of Noise Transmission through Damped Sandwich Structures Journal Article Journal of Vibration and Acoustics, 135 (5), pp. 1-13, 2013. @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} } 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. |
Guerich, Mohamed; Assaf, Samir Design vibro-acoustic Optimization of Sandwich panels Proceeding INTERNOISE’2013, Innsbruck, AUSTRIA, 2013. @proceedings{GUERICH2013b, title = {Design vibro-acoustic Optimization of Sandwich panels}, author = { Mohamed Guerich and Samir Assaf}, year = {2013}, date = {2013-09-18}, publisher = {INTERNOISE’2013}, address = {Innsbruck, AUSTRIA}, keywords = {}, pubstate = {published}, tppubtype = {proceedings} } |
Hoang, Trung Hieu; Guerich, Mohamed; Yvonnet, Julien Determination of the size of an RVE for nonlinear random composites Proceeding 3rd ICMM Int. Conference on Material Modelling incorporating, Warsaw, POLAND, 2013. @proceedings{HOANG2013, title = {Determination of the size of an RVE for nonlinear random composites}, author = { Trung Hieu Hoang and Mohamed Guerich and Julien Yvonnet}, year = {2013}, date = {2013-09-11}, publisher = {3rd ICMM Int. Conference on Material Modelling incorporating}, address = {Warsaw, POLAND}, keywords = {}, pubstate = {published}, tppubtype = {proceedings} } |
Adam, Cédric; Bouabdallah, Salim; Zarroug, Malek; Maitournam, Habibou Formulation of an Isogeometric shell element for crash simulation Conference XII International Conference on Computational Plasticity, Barcelona, 3-5 September 2013., 2013. @conference{Bouabdallah2013b, title = {Formulation of an Isogeometric shell element for crash simulation}, author = { Cédric Adam and Salim Bouabdallah and Malek Zarroug and Habibou Maitournam}, year = {2013}, date = {2013-09-03}, publisher = {XII International Conference on Computational Plasticity, Barcelona, 3-5 September 2013.}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Kallel, Achraf; Bouabdallah, Salim; Roelandt, Jean-Marc A mortar algorithm for finite deformation contact problem Conference 21° Congrès Français de Mécanique, Bordeaux, 26 – 30 Août 2013, 2013. @conference{Bouabdallah2013bb, title = {A mortar algorithm for finite deformation contact problem}, author = { Achraf Kallel and Salim Bouabdallah and Jean-Marc Roelandt}, year = {2013}, date = {2013-08-26}, publisher = {21° Congrès Français de Mécanique, Bordeaux, 26 – 30 Août 2013}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Kallel, Achraf; Bouabdallah, Salim; Roelandt, Jean-Marc A simple scheme for two dimensional mortar frictional contact problems Conference 3rd International Conference on Computational Contact Mechanics, Lecce, 10-12 July 2013, 2013. @conference{Bouabdallah2013bb, title = {A simple scheme for two dimensional mortar frictional contact problems}, author = { Achraf Kallel and Salim Bouabdallah and Jean-Marc Roelandt}, year = {2013}, date = {2013-07-10}, publisher = {3rd International Conference on Computational Contact Mechanics, Lecce, 10-12 July 2013}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Adam, Cédric; Bouabdallah, Salim; Zarroug, Malek; Maitournam, Habibou Formulation d'un élément coque en analyse isogéométrique pour la simulation du choc Conference , 11e Colloque National en Calcul des Structures, Giens, 13-17 Mai 2013, 2013. @conference{Bouabdallah2013bb, title = {Formulation d'un élément coque en analyse isogéométrique pour la simulation du choc}, author = { Cédric Adam and Salim Bouabdallah and Malek Zarroug and Habibou Maitournam}, year = {2013}, date = {2013-05-13}, publisher = {, 11e Colloque National en Calcul des Structures, Giens, 13-17 Mai 2013}, keywords = {}, pubstate = {published}, tppubtype = {conference} } |
Lin, Wei; Clain, Pascal; Dalmazzone, Didier; Fürst, Walter; Delahaye, Anthony; Fournaison, Laurence Accurate DSC measurement of the phase transition temperature in the TBPB–water system Journal Article The Journal of Chemical Thermodynamics, 61 , pp. 132–137, 2013. @article{LCDFDF13a, title = {Accurate DSC measurement of the phase transition temperature in the TBPB–water system}, 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/2013/LCDFDF13a}, year = {2013}, date = {2013-01-01}, journal = {The Journal of Chemical Thermodynamics}, volume = {61}, pages = {132--137}, abstract = {There is some disagreement in the literature on the phase transition temperatures of salt semi-clathrates, which melt incongruently due to the change of salt concentration in the liquid phase. By using differential scanning calorimetry (DSC), the phase transition temperatures of tetrabutylphosphonium bromide (TBPB) hydrates were investigated at 0.10 < wTBPB < 0.37 and atmospheric pressure. The freezing point of ice with the presence of NaCl was also studied as a reference. In this work, two DSC procedures were employed: dynamic and stepwise schemes, characterized by the maximum peak temperature Tpeak and inflection point temperature Tend, and final step temperature Tstep, respectively. The stepwise DSC scheme was validated by the measurement of the ice freezing point at wNaCl = 0.10, 0.15 and 0.18. For the dynamic scheme, we developed and tested a method to estimate the melting temperature of TBPB hydrates. This method, though having a higher uncertainty, was more efficient than the stepwise scheme. The phase transition temperatures of TBPB hydrates are presented with the accuracy of 0.1 K and compared with literature data.}, keywords = {}, pubstate = {published}, tppubtype = {article} } There is some disagreement in the literature on the phase transition temperatures of salt semi-clathrates, which melt incongruently due to the change of salt concentration in the liquid phase. By using differential scanning calorimetry (DSC), the phase transition temperatures of tetrabutylphosphonium bromide (TBPB) hydrates were investigated at 0.10 < wTBPB < 0.37 and atmospheric pressure. The freezing point of ice with the presence of NaCl was also studied as a reference. In this work, two DSC procedures were employed: dynamic and stepwise schemes, characterized by the maximum peak temperature Tpeak and inflection point temperature Tend, and final step temperature Tstep, respectively. The stepwise DSC scheme was validated by the measurement of the ice freezing point at wNaCl = 0.10, 0.15 and 0.18. For the dynamic scheme, we developed and tested a method to estimate the melting temperature of TBPB hydrates. This method, though having a higher uncertainty, was more efficient than the stepwise scheme. The phase transition temperatures of TBPB hydrates are presented with the accuracy of 0.1 K and compared with literature data. |
Clain, Pascal; Ndoye, Fatou-Toutie; Delahaye, Anthony; Fournaison, Laurence Frio Calor Aire Acondicionado, 41 (460), pp. 3–10, 2013. @article{CNDF13, title = {Comportamiento de flujo y equilibrio de fases de las suspensiones de hidratos de TBPB (bromuro de tetra-n-butilfosfonio) en medios porosos para aplicaciones de refrigeracion}, author = { Pascal Clain and Fatou-Toutie Ndoye and Anthony Delahaye and Laurence Fournaison}, url = {http://labs.esilv.fr/publications/public/2013/CNDF13}, year = {2013}, date = {2013-01-01}, journal = {Frio Calor Aire Acondicionado}, volume = {41}, number = {460}, pages = {3--10}, abstract = {The present work investigates the use of hydrates, as appropriate media for cold storage and distribution in refrigeration applications. Previous studies showed that these hydrates are able to trap molecules of carbon dioxide resulting in mixed hydrates. Hydrate can be used as phase change material (PCM) for thermal energy storage and hydrate slurries could be a good solution for industrial issues of cold distribution at various temperature levels. In fact, hydrates formed from tetra-n-butylphosphonium bromide (TBPB) + water mixtures have equilibrium conditions required for air-conditioning applications, with melting temperature at 281 K at atmospheric pressure. Calorimetry devices were used for determining dissociation enthalpies of salt hydrates under vari-ous stability conditions and salt concentrations in bulk and porous media. The results reveal that TBPB hydrates formed in porous media at lower temperature than in bulk conditions for a constant pressure due to capillary forces. In order to characterize the flow behavior of hydrate slurries for cold distribution, a rheological study was carried out in a dynamic loop by the Ostwald method. Finally, FBRM probe was used for a particle size analysis of TBPB hydrate and showed a bimodal distribution which could be confirmed in further work in order to define a potential relation between hydrate particle size and rheological behavior of hydrate slurry.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The present work investigates the use of hydrates, as appropriate media for cold storage and distribution in refrigeration applications. Previous studies showed that these hydrates are able to trap molecules of carbon dioxide resulting in mixed hydrates. Hydrate can be used as phase change material (PCM) for thermal energy storage and hydrate slurries could be a good solution for industrial issues of cold distribution at various temperature levels. In fact, hydrates formed from tetra-n-butylphosphonium bromide (TBPB) + water mixtures have equilibrium conditions required for air-conditioning applications, with melting temperature at 281 K at atmospheric pressure. Calorimetry devices were used for determining dissociation enthalpies of salt hydrates under vari-ous stability conditions and salt concentrations in bulk and porous media. The results reveal that TBPB hydrates formed in porous media at lower temperature than in bulk conditions for a constant pressure due to capillary forces. In order to characterize the flow behavior of hydrate slurries for cold distribution, a rheological study was carried out in a dynamic loop by the Ostwald method. Finally, FBRM probe was used for a particle size analysis of TBPB hydrate and showed a bimodal distribution which could be confirmed in further work in order to define a potential relation between hydrate particle size and rheological behavior of hydrate slurry. |
Clain, Pascal; Oignet, Jeremy; Delahaye, Anthony; Fournaison, Laurence Experimental and thermodynamic of a cold storage hydrate slurries process Inproceedings Société Française des Génies des Procédés, Lyon, France, 2013. @inproceedings{CODF13, title = {Experimental and thermodynamic of a cold storage hydrate slurries process}, author = { Pascal Clain and Jeremy Oignet and Anthony Delahaye and Laurence Fournaison}, url = {http://labs.esilv.fr/publications/public/2013/CODF13}, year = {2013}, date = {2013-01-01}, booktitle = {Société Française des Génies des Procédés}, address = {Lyon, France}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Courbin, Pierre; Lupu, Irina; Goossens, Joël Scheduling of hard real-time multi-phase multi-thread (MPMT) periodic tasks Journal Article Real-Time Systems, 49 (2), pp. 239-266, 2013. @article{CLG13, title = {Scheduling of hard real-time multi-phase multi-thread (MPMT) periodic tasks}, author = { Pierre Courbin and Irina Lupu and Joël Goossens}, url = {http://labs.esilv.fr/publications/public/2013/CLG13}, year = {2013}, date = {2013-01-01}, journal = {Real-Time Systems}, volume = {49}, number = {2}, pages = {239-266}, abstract = {In this paper we study the scheduling of parallel and real-time recurrent tasks on multiprocessor platforms. Firstly, we propose a new parallel task model which allows recurrent tasks to be composed of several phases, each one composed of several threads. Each thread requires a single processor for execution and can be scheduled simultaneously. We then propose an algorithm to transpose popular Fork-Join task model to our MPMT task model. Secondly, we define several kinds of real-time schedulers that can be applied to our parallel task model. We distinguish between two scheduling classes: Hierarchical schedulers and Global Thread schedulers. We present and prove correct an exact schedulability test for each class. Lastly, we also evaluate the performance of our scheduling paradigm in comparison with Gang scheduling by means of simulations. In this work we extend the work of Lupu and Goossens in Scheduling of hard real-time multi-thread periodic tasks (Real-Time and Network Systems, 2011) which considers mono-phase multi-thread task model. We extend their previous results to a Multi-Phase Multi-Thread task model.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this paper we study the scheduling of parallel and real-time recurrent tasks on multiprocessor platforms. Firstly, we propose a new parallel task model which allows recurrent tasks to be composed of several phases, each one composed of several threads. Each thread requires a single processor for execution and can be scheduled simultaneously. We then propose an algorithm to transpose popular Fork-Join task model to our MPMT task model. Secondly, we define several kinds of real-time schedulers that can be applied to our parallel task model. We distinguish between two scheduling classes: Hierarchical schedulers and Global Thread schedulers. We present and prove correct an exact schedulability test for each class. Lastly, we also evaluate the performance of our scheduling paradigm in comparison with Gang scheduling by means of simulations. In this work we extend the work of Lupu and Goossens in Scheduling of hard real-time multi-thread periodic tasks (Real-Time and Network Systems, 2011) which considers mono-phase multi-thread task model. We extend their previous results to a Multi-Phase Multi-Thread task model. |
Oignet, Jeremy; Clain, Pascal; Jerbi, Salem; Delahaye, Anthony; Fournaison, Laurence Study of a secondary refrigeration loop hydrate slurries Inproceedings Société Française des Génies des Procédés, Lyon, France, 2013. @inproceedings{OCJDF13, title = {Study of a secondary refrigeration loop hydrate slurries}, author = { Jeremy Oignet and Pascal Clain and Salem Jerbi and Anthony Delahaye and Laurence Fournaison}, url = {http://labs.esilv.fr/publications/public/2013/OCJDF13}, year = {2013}, date = {2013-01-01}, booktitle = {Société Française des Génies des Procédés}, address = {Lyon, France}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Lin, Wei; Clain, Pascal; Dalmazzone, Didier; Fürst, Walter; Delahaye, Anthony; Fournaison, Laurence Thermodynamic Studies of CO2 + TBAB + Water System: Experimental Measurements and Correlations Journal Article Journal of Chemical & Engineering Data, 58 (8), pp. 2233–2239, 2013. @article{LCDFDF13, title = {Thermodynamic Studies of CO2 + TBAB + Water System: Experimental Measurements and Correlations}, 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/2013/LCDFDF13}, year = {2013}, date = {2013-01-01}, journal = {Journal of Chemical & Engineering Data}, volume = {58}, number = {8}, pages = {2233--2239}, abstract = {Thermodynamic properties of TBAB + CO2 + water system are important for using TBAB + CO2 semiclathrate hydrates in some promising hydrate-based techniques. This work is an experimental and modeling study of two fundamental properties in vapor?liquid phase equilibrium of TBAB + CO2 + water, that is, CO2 solubility in TBAB solution and density of CO2-saturated TBAB solution. With the use of a PVT system, CO2 solubility was measured; thus, Henry?s constant was obtained at temperatures from 288.1 K to 303.1 K and TBAB mass fraction from 0.10 to 0.40. Our results showed that CO2 is either salted-in or salted-out by the presence of TBAB, depending upon the temperature and TBAB concentration. For the density, we present experimental data for TBAB + water system at T = 283.15 K to 303.15 K with pressures up to 5 MPa. The density of CO2-saturated TBAB aqueous solution was calculated with the help of Duan?s model, which takes into account the effect of pressure and temperature to calculate the apparent molar volume of dissolved CO2 in pure water.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Thermodynamic properties of TBAB + CO2 + water system are important for using TBAB + CO2 semiclathrate hydrates in some promising hydrate-based techniques. This work is an experimental and modeling study of two fundamental properties in vapor?liquid phase equilibrium of TBAB + CO2 + water, that is, CO2 solubility in TBAB solution and density of CO2-saturated TBAB solution. With the use of a PVT system, CO2 solubility was measured; thus, Henry?s constant was obtained at temperatures from 288.1 K to 303.1 K and TBAB mass fraction from 0.10 to 0.40. Our results showed that CO2 is either salted-in or salted-out by the presence of TBAB, depending upon the temperature and TBAB concentration. For the density, we present experimental data for TBAB + water system at T = 283.15 K to 303.15 K with pressures up to 5 MPa. The density of CO2-saturated TBAB aqueous solution was calculated with the help of Duan?s model, which takes into account the effect of pressure and temperature to calculate the apparent molar volume of dissolved CO2 in pure water. |
