Literatura científica selecionada sobre o tema "Probleme multiphysique"
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Teses / dissertações sobre o assunto "Probleme multiphysique"
Ben, El Haj Ali Amin. "Calcul distribué pour des problèmes multiphysiques". Mémoire, École de technologie supérieure, 2002. http://espace.etsmtl.ca/798/1/BEN_EL_HAJ_ALI_Amin.pdf.
Texto completo da fonteBen, El Haj Ali Amin. "Calcul distribué pour des problèmes multiphysiques /". Thèse, Montréal : École de technologie supérieure, 2002. http://proquest.umi.com/pqdweb?did=1253504701&sid=2&Fmt=2&clientId=46962&RQT=309&VName=PQD.
Texto completo da fonte"Mémoire présenté à l'École de technologie supérieure comme exigence partielle à l'obtention de la maîtrise en génie mécanique". CaQMUQET Bibliogr.: f. [162]-165. Également disponible en version électronique. CaQMUQET
Néron, David. "Sur une stratégie de calcul pour les problèmes multiphysiques". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2004. http://tel.archives-ouvertes.fr/tel-00133655.
Texto completo da fonteMastrippolito, Franck. "Optimisation de forme numérique de problèmes multiphysiques et multiéchelles : application aux échangeurs de chaleur". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEC043/document.
Texto completo da fonteHeat exchangers are used in many industrial applications. Optimizing their performances is a key point to improve energy efficiency. Heat exchanger behaviour is a multi-scale issue where local scale enhancement mechanisms coexist with global scale distribution ones. It is also multi-physics such as fluid mecanics, heat transfer and fouling phenomenons appear. The present work deals with multi-objective shape optimization of heat echanger. The proposed method is sufficiently robust to address multi-scale and multi-physics issues and allows industrial applications. Heat exchanger performances are evaluated using computational fluid dynamics (CFD) simulations and global methods (є-NUT). The optimization tools are a genetic algorithm coupled with kriging-based metamodelling. Clustering and Self-Organizing Maps (SOM) are used to analyse the optimization results. A metamodel builts an approximation of a simulator response (CFD) whose evaluation cost is reduced to be used with the genetic algorithm. Kriging can address discontinuities or perturbations of the response by introducing a nugget effect. Adaptive sampling is used to built cheap and precise approximation. The present optimization method is applied to different configurations which are representative of the heat exchanger behaviour for both multi-scale and multi-physics (fouling) aspects. Results show that metamodelling is a key point of the method, ensuring the robustness and the versatility of the optimisation process. Also, it allows to built correlations of the local scale used to determine the global performances of the heat exchanger. Clustering and SOM highlight a finite number of shapes, which represent a compromise between antagonist objective functions, directly usable in an industrial context
Ramadan, Mohamad. "Une méthode MultiMaillages MultiPhysiques parallèle pour accélérer les calculs des procédés incrémentaux". Phd thesis, École Nationale Supérieure des Mines de Paris, 2010. http://pastel.archives-ouvertes.fr/pastel-00536041.
Texto completo da fonteDureisseix, David. "Vers des stratégies de calcul performantes pour les problèmes multiphysiques et le passage par le multiéchelle". Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 2001. http://tel.archives-ouvertes.fr/tel-00083731.
Texto completo da fontePlus récemment, l'émergence des modélisations multiphysiques couplées requière des capacités de traitement d'autant plus grandes. Une particularité de ce type de modélisations est le caractère multiéchelle marqué, à la fois en temps et en espace, du problème couplé.
Dans ce mémoire, les travaux réalisés pour tirer parti du caractère multiéchelle en espace concernent principalement une stratégie de calcul micro / macro située à l'intersection des méthodes de décomposition de domaine, et des stratégies d'homogénéisation. Elle conduit à une stratégie de calcul extensible, et à une homogénéisation automatique, qui ne nécessite pas de traitement particulier des zones bords. Dans un deuxième temps, une stratégie de calcul adaptée aux problèmes multiphysiques, et développée dans le cadre de la poroélasticité, est présentée et sa faisabilité est montrée, sans tirer encore parti des propriétés du problème (multiéchelle à la fois en espace et en temps) pour augmenter ses performances.
Outre ce dernier point, pour aller vers des stratégies performantes pour le multiphysique, les perspectives intègrent entre autre, le contrôle et l'adaptivité pour la robustesse de l'approche, et le couplage de codes pour la mise en oeuvre. L'objectif est la construction d'outils permettant la simulation de composants ou de systèmes mettant en jeu des physiques différentes, et, comme c'est aussi souvent leur cas aussi, des procédés d'obtention et de conception.
Pelletier, Charles. "Etude mathématique du problème de couplage océan-atmosphère incluant les échelles turbulentes". Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAM014/document.
Texto completo da fonteThis thesis focuses on the numerical modelling of the air-sea coupling. Although they share some common features, these two physical environments are sufficiently dissimilar for their numerical treatment to be carried out by distinct models, each including their own specificities. The interactions between these two components are thus taken into account through coupling algorithms.Implementing such algorithms requires proper understanding of the oceanic and atmospheric modelling, most importantly in the vicinity of their common interface. Therefore a substantial part of this thesis dissects, analyzes and completes turbulent parameterization schemes, which are the numerical mechanisms, defined at a continuous level, through which the turbulent surface layer at the vicinity of the sea surface is treated. Two theoretically and numerically meaningful sources of errors in the standard numerical modelling of the air-sea interface have been isolated.The first source of error lies in the continuous formulation of the turbulent parameterizations, which are currently used in an incomplete manner, leading to mathematically irregular solution profiles. By carefully studying their theoretical bases, this thesis extends the parameterizations, allowing them to generate regular profiles within a standardized, bi-domain framework. Numerical investigations on physically relevant test cases show that including such an extension can result in considerable bias (of the order of 20%) in air-sea fluxes evaluations. From a theoretical perspective, carrying this extension leads to establishing simple criteria under which the air-sea coupling can be considered as coherent with respect to the two physical environments, and more importantly, to the turbulent parameterizations.The second source of error is algorithmic in essence: it is linked to the temporal discretization of the coupling mechanisms. Existing ad hoc methods do not guarantee perfect coherence of the air-sea fluxes from one model to the other. Global in time Schwarz algorithms, which have first been developed as domain decomposition methods, are good candidates for correcting these flaws, although their implementation to the air-sea context is a considerable challenge, given the complexity of this problem. Investigations on the numerical impact of such algorithms are carried out on simplified test cases. Thanks to the undertaken work on turbulent parameterizations, perspectives on the development of coupling algorithms are given, regarding both their coherence as per the aforementioned conditions, and the gradually increasing complexity of physical effects that are accounted for
Pethe, Rohit. "Variational h-adaptation for strongly coupled problems in thermo-mechanics". Thesis, Ecole centrale de Nantes, 2017. http://www.theses.fr/2017ECDN0046.
Texto completo da fonteA mesh adaption approach for strongly coupled problems is proposed, based on a variational principle. The adaption technique relies on error indicated by an energy-like potential and is hence free from error estimates. According to the saddle point nature of this variational principle, a staggered solution approach appears more natural and leads to separate mesh adaption for mechanical and thermal fields. Using different meshes for different phenomena, precise solutions for various fields under consideration are obtained. Internal variables are considered constant over Voronoi cells, so no complex remapping procedures are necessary to transfer internal variables. Since the algorithm is based on a set of tolerance parameters, parametric analyses and a study of their respective influence on the mesh adaption is carried out. This detailed analysis is performed on uni-dimensional problems. The proposed method is shown to be cost effective than uniform meshing, some applications of the proposed approach to various 2D examples including shear bands and friction welding are presented
Nguyen, Tuan Linh. "La Décomposition propre généralisée pour la résolution de problèmes multiphysiques transitoires couplés dédiés à la mécanique des matériaux". Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique, 2012. https://theses.hal.science/docs/00/78/59/85/PDF/manuscrit_final_NGUYEN_Tuan_Linh_ENSMA_Poitiers_v2B.pdf.
Texto completo da fonteThis work presents the development of the Proper Generalized Decomposition (PGD) method for solving couple transient multiphysics problems with different characteristic times. This method consists in approximating solutions ( Partial Differentiai Equations with separated representations. The 2D transient heat equation is initially considered. A automatic adaptive mesh technique is proposed in order to make the discretization fit the different transient domains. Tw different couplings between the PGD method and the adaptive mesh refinement technique are discussed: the frrst on consists in computing the PGD solution for each new mesh from the null solution; the second one consists in enrichin the PGD solution for each new mesh from the basis functions generated on the previous meshes. The frrst coupling. More efficient since fewer modes are required to accurately describe the solution on the final mesh. Nevertheless, th second one decreases the number of enrichments cumulated tbrough the mesh refmement pro cess. Regardless of th coupling used, the adaptive mesh technique is able to automatically describe the localized transient zones. The II transient heat equation with a non linear source term is also studied. A new approach combining the PGD method and th Asymptotic Numerical Method (ANM) is tested, which allows to efficiently solve sorne families of non linear transiel problems. Finally, two muItitime and multiphysics problems are considered. It consists of a partially coupled he diffusion problem and a strongly coupled thermoviscoelastic problem. The PGD method gives an accurate prediction c the response of these muItiphysics problems for which the coupling terms lead to specific transient zones. Combined wit the PGD method, the adaptive mesh technique is particularly suitable for these situations of strongly coupled tim multiscale. This combination brings to the same conclusions as in the case of a single physical phenomenon. The discussion focuses on two strategies of mesh construction: concatenating the time meshes of each physical phenomeno or refme each mesh independently. The concatenation of two meshes allows a convergence with fewer steps of mes refmement but with a much bigher mesh density
Corcolle, Romain. "Détermination de lois de comportement couplé par des techniques d'homogénéisation : application aux matériaux du génie électrique". Paris 11, 2009. http://www.theses.fr/2009PA112351.
Texto completo da fonteThis study is focused on the development of accurate homogenization models for coupled behavior (such as piezoelectricity or magnetostriction). The main development in this study is the adaptation of classical uncoupled methods based on a clever decomposition of the fields in different terms, depending on their physical origin. Nonlinear behavior has been taken into account through a linearization process. An improvement has been obtain by including the second order moments of the fields in the models. The developed models have been validated through a comparison of the results with the ones obtained from a Finite Element model. The results show a good agreement with a very lower computational cost for homogenization (ratio over 1000 when dealing with linear constitutive laws). The homogenization model has also been able to catch extrinsic effects, such as the magnetoelectric effect. The ratio between estimation quality / computation time shows the advantages of homogenization methods, which have been successfully adapted to coupled behavior