Literatura académica sobre el tema "Modèle numérique multi-échelle"
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Tesis sobre el tema "Modèle numérique multi-échelle"
Touzeau, Josselyn. "Approches numérique multi-échelle/multi-modèle de la dégradation des matériaux composites". Phd thesis, Ecole Centrale Paris, 2012. http://tel.archives-ouvertes.fr/tel-00837874.
Texto completoAymard, Benjamin. "Simulation numérique d'un modèle multi-échelle de cinétique cellulaire formulé à partir d'équations de transport non conservatives". Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066254/document.
Texto completoThe thesis focuses on the numerical simulation of a biomathematical, multiscale model explaining the phenomenon of selection within the population of ovarian follicles, and grounded on a cellular basis. The PDE model consists of a large dimension hyperbolic quasilinear system governing the evolution of cell density functions for a cohort of follicles (around twenty in practice).The equations are coupled in a nonlocal way by control terms involving moments of the solution, defined on either the mesoscopic or macroscopic scale.Three chapters of the thesis, presented in the form of articles, develop the method used to simulate the model numerically. The numerical code is implemented on a parallel architecture. PDEs are discretized with a Finite Volume scheme on an adaptive mesh driven by a multiresolution analysis. Flux discontinuities, at the interfaces between different cellular states, require a specific treatment to be compatible with the high order numerical scheme and mesh refinement.A chapter of the thesis is devoted to the calibration method, which translates the biological knowledge into constraints on the parameters and model outputs. The multiscale character is crucial, since parameters are used at the microscopic level in the equations governing the evolution of the density of cells within each follicle, whereas quantitative biological data are rather available at the mesoscopic and macroscopic levels.The last chapter of the thesis focuses on the analysis of computational performances of the parallel code, based on statistical methods inspired from the field of uncertainty quantification
Bernard, Manuel. "Approche multi-échelle pour les écoulements fluide-particules". Phd thesis, Toulouse, INPT, 2014. http://oatao.univ-toulouse.fr/12239/1/Bernard.pdf.
Texto completoDu, Shuimiao. "Investigations numériques multi-échelle et multi-niveau des problèmes de contact adhésif à l'échelle microscopique". Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLC080.
Texto completoThe ultimate goal of this work is to provide computationally efficient and robust methodologies for the modelling and solution of a class of Lennard-Jones (LJ) potential-based adhesive contact problems. To alleviate theoretical and numerical pitfalls of the LJ model related to its non-defined and nonbounded characteristics, a model-adaptivity method is proposed to solve the pure-LJ problem as the limit of a sequence of adaptively constructed multilevel problems. Each member of the sequence consists of a model partition between the microscopic LJ model and the macroscopic Signorini model. The convergence of the model-adaptivity method is proved mathematically under some physical and realistic assumptions. On the other hand, the asymptotic numerical method (ANM) is adapted to track accurately instabilities for soft contact problems. Both methods are incorporated in the Arlequin multiscale framework to achieve an accurate resolution at a reasonable computational cost. In the model-adaptivity method, to capture accurately the localization of the zones of interest (ZOI), a two-step strategy is suggested: a macroscopic resolution is used as the first guess of the ZOI localization, then the Arlequin method is used there to achieve a fine scale resolution. In the ANM strategy, the Arlequin method is also used to suppress numerical oscillations and improve accuracy
Avril, Quentin. "Détection de Collision pour Environnements Large Échelle : Modèle Unifié et Adaptatif pour Architectures Multi-coeur et Multi-GPU". Phd thesis, INSA de Rennes, 2011. http://tel.archives-ouvertes.fr/tel-00642067.
Texto completoLe, Minh Hoang. "Modélisation multi-échelle et simulation numérique de l'érosion des sols de la parcelle au bassin versant". Phd thesis, Université d'Orléans, 2012. http://tel.archives-ouvertes.fr/tel-00838947.
Texto completoMinh-Hoang, Le. "Modélisation multi-échelle et simulation numérique de l'érosion des sols de la parcelle au bassin versant". Phd thesis, Université d'Orléans, 2012. http://tel.archives-ouvertes.fr/tel-00780648.
Texto completoLe, Minh Hoang. "Modélisation multi-échelle et simulation numérique de l’érosion des sols de la parcelle au bassin versant". Thesis, Orléans, 2012. http://www.theses.fr/2012ORLE2059/document.
Texto completoThe overall objective of this thesis is to study a multiscale modelling and to develop a suitable method for the numerical simulation of soil erosion on catchment scale. After reviewing the various existing models, we derive an analytical solution for the non-trivial coupled system modelling the bedload transport. Next, we study the hyperbolicity of the system with different sedimentation laws found in the literature. Relating to the numerical method, we present the validity domain of the time splitting method, consisting in solving separately the Shallow-Water system (modelling the flow routing) during a first time step for a fixed bed and updating afterward the topography on a second step using the Exner equation. On the modelling of transport in suspension at the plot scale, we present a system coupling the mechanisms of infiltration, runoff and transport of several classes of sediment. Numerical implementation and validation tests of a high order wellbalanced finite volume scheme are also presented. Then, we discuss on the model application and calibration using experimental data on ten 1 m2 plots of crusted soil in Niger. In order to achieve the simulation at the catchment scale, we develop a multiscale modelling in which we integrate the inundation ratio in the evolution equations to take into account the small-scale effect of the microtopography. On the numerical method, we study two well-balanced schemes : the first one is the Roe scheme based on a path conservative, and the second one is the scheme using a generalized hydrostatic reconstruction. Finally, we present a first model application with experimental data of the Ganspoel catchment where the parallel computing is also motived
Fayard, Franck. "Génération de MNT d'une zone montagneuse par radargrammétrie et approche multi-échelle". Phd thesis, INSA de Rennes, 2010. http://tel.archives-ouvertes.fr/tel-00820847.
Texto completoDaouk, Elias. "Etudes expérimentale et numérique de la pyrolyse oxydante de la biomasse en lit fixe". Thesis, Nantes, Ecole des Mines, 2015. http://www.theses.fr/2015EMNA0241/document.
Texto completoWood Multi-staged gasification in a fixed bed reactor is suitable for small-scale electricity generation. In these processes, the pyrolysis is performed in a continuous downward fixed bed reactor. The main feature of this reactor is the autothermal operation. Energy for heating, drying and pyrolysis is supplied by partial combustion of wood, known as “oxidative pyrolysis”. The air introduced from the top of the reactor induces a combustion front that propagates countercurrent with the solids and gazes flows. The work presented in this document aimed to achieve a better description of this process. A multi-scale approach was considered. Therefore, we have firstly studied the behavior of an isolated particle before focusing on the overall fixed bed. At the particle scale, we have quantified the effect of oxygen and of particle size on the oxidative pyrolysis kinetics. This led us to the setup of a kinetic model for this transformation.At the fixed bed scale, the propagation of the combustion front was studied considering the experimental and numerical approaches, which provides a better understanding of this step of the wood staged gasifiers