Academic literature on the topic 'Conditions aux limites approchées'
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Journal articles on the topic "Conditions aux limites approchées":
Ammari, Habib, and Chiraz Latiri-Grouz. "Conditions aux limites approchées pour les couches minces périodiques." ESAIM: Mathematical Modelling and Numerical Analysis 33, no. 4 (July 1999): 673–92. http://dx.doi.org/10.1051/m2an:1999157.
Rahmani, Leila. "Conditions aux limites approchées pour une plaque mince non linéaire." Comptes Rendus Mathematique 343, no. 1 (July 2006): 57–62. http://dx.doi.org/10.1016/j.crma.2006.04.013.
Boun-jad, Mohamed, and Toufik Zebbiche. "Solution de l’équation de Poisson dans un domaine bidimensionnel par la méthode des éléments finis." Journal of Renewable Energies 16, no. 3 (October 22, 2023): 441–84. http://dx.doi.org/10.54966/jreen.v16i3.392.
Karsenty, Alain. "Forêts : les promesses non tenues des instruments économiques." Économie appliquée 65, no. 2 (2012): 137–67. http://dx.doi.org/10.3406/ecoap.2012.3604.
Ambroise, B. "Génèse des débits dans les petits bassins versants ruraux en milieu tempéré: 1 - Processus et facteurs." Revue des sciences de l'eau 11, no. 4 (April 12, 2005): 471–96. http://dx.doi.org/10.7202/705317ar.
Aussedat, Laure. "Le défi de l'institutionnalisation des savoirs d'expérience dans les services de rétablissement. Une approche pragmatiste." Dialogue 61, no. 1 (April 2022): 83–106. http://dx.doi.org/10.1017/s0012217322000129.
LEGRAND, M., A. JOVENIAUX, A. ARBAROTTI, B. DE GOUVELLO, F. ESCULIER, and J. P. TABUCHI. "Séparation à la source et valorisation des excrétas humains du Grand Paris : des filières émergentes." Techniques Sciences Méthodes 9, no. 9 (September 20, 2021): 103–18. http://dx.doi.org/10.36904/tsm/202109103.
Stettinger, Vanessa. "De l’invisibilisation de la pauvreté à la visibilité des « désordres » familiaux." Revue française des affaires sociales, no. 3 (December 5, 2023): 91–110. http://dx.doi.org/10.3917/rfas.233.0091.
Delgoulet, Catherine, Serge Volkoff, Laurent Caron, Fabienne Caser, Annie Jolivet, and Laurence Théry. "Conditions de travail et maintien en emploi des seniors : enjeux d’un « décloisonnement » des approches et des pratiques." Articles 69, no. 4 (January 21, 2015): 687–708. http://dx.doi.org/10.7202/1028108ar.
Horta, Jose da Silva. "La Perception Du Mande et De L'Identite Mandingue Dans Les Textes Europeens, 1453–1508." History in Africa 23 (January 1996): 75–86. http://dx.doi.org/10.2307/3171934.
Dissertations / Theses on the topic "Conditions aux limites approchées":
Vial, Grégory. "Analyse multi-échelle et conditions aux limites approchées pour un problème avec couche mince dans un domaine à coin." Rennes 1, 2003. https://tel.archives-ouvertes.fr/tel-00005153.
Vial, Grégory. "Analyse asymptotique multi-échelle et conditions aux limites approchées pour un problème de couche mince dans un domaine à coin." Phd thesis, Université Rennes 1, 2003. http://tel.archives-ouvertes.fr/tel-00005153.
Auvray, Alexis. "Contributions à l'amélioration de la performance des conditions aux limites approchées pour des problèmes de couche mince en domaines non réguliers." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEC018/document.
Transmission problems with thin layer are delicate to approximate numerically, because of the necessity to build meshes on the scale of the thin layer. It is common to avoid these difficulties by using problems with approximate boundary conditions — also called impedance conditions. Whereas the approximation of transmission problems by impedance problems turns out to be successful in the case of smooth domains, the situation is less satisfactory in the presence of corners and edges. The goal of this thesis is to propose new impedance conditions, more efficient, to correct this lack of performance. For that purpose, the asymptotic expansions of the various models -problems are built and studied to locate exactly the origin of the loss, in connection with the singular profiles associated to corners and edges. New impedance conditions are built, of multi-scale Robin or Venctel types. At first studied in dimension 2, they are then generalized in certain situations in dimension 3. Simulations have been carried out to confirm the efficiency of the theoretical methods to some
Rosier, Carole. "Étude numérique des équations bi-dimensionnelles de Navier-Stokes avec conditions aux limites périodiques." Paris 11, 1989. http://www.theses.fr/1989PA112234.
The aim of this work is to describe a new numerical method, well suited for computing the solution of the Navier-Stokes equations over large time intervals. Introduced by Foias, Manley and Temam, this method corresponds to a projection of the equations on a nonlinear subspace, while the usual Galerkin method can be interpreted as a projection on a linear space; this is why it is called "The nonlinear Galerkin method". The work is organized as follows. In the first chapter a description of the problem is presented and some theoretical results concerning the behavior as it goes to infinity of the solutions are recalled. The second chapter is devoted to a comparative study of schemes based on different time discretizations of the Navier-Stokes equations. Our study shows that the predictor-corrector or Runge-Kutta schemes are better suited to the Galerkin approximation than a projection scheme or the Adams-Bashforth-Crank Nicholson scheme. These schemes are used in the numerical calculations. In the third chapter, a theoretical motivation of the nonlinear Galerkin method is presented. We define manifolds, the approximate inertial manifolds, which approximate the strange attractor, and which describe the interaction between the small and large eddies of the flow. Numerical tests are given in the last chapter
Chamaillard, Mathieu. "Effective boundary conditions for thin periodic coatings." Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLY001.
We have dealt with the case of the scalar Helmholtz equation. We will try to handle the case of Maxwell's equation. We also will focus on the case of meta-materials. In a first case the permittivity is negative in the thin layer and in the second case is the permeability (1/delta) ^ 2
Abbaspour, Nima. "Approche numérique et expérimentale des écoulements au sein des piles à combustible : innovations liées aux conditions aux limites." Thesis, Avignon, 2020. http://www.theses.fr/2020AVIG0507.
This thesis is part of a wider project that aims at improving proton exchange membrane fuel cell (PEMFC) efficiency and stability. Our contribution aims at improving the geometry and structure of channels in anode and cathode bipolar plates (BPP) using experiments and simulations. The operation of a PEMFC involves multiphase flows and multiphysics phenomenon such as reactant concentration and electron exchange between the components. To simulate such a complex system employed industrial codes as well as Lattice Boltzmann Method. Chapter 1 reminds the basic principle of PEM fuel cell and the role of the fluids that flow through BPP channels. We describe a standard version of the latter and the modifications which we consider here. Chapter 2 details a classical model that describes PEM fuel cell operation in steady regime and assumes single phase flows in channels. The underlying equations and their simulation (using COMSOL) are validated by an experiment performed on standard single cell. The simulation evidences channels exhibiting unequal fluid fluxes while the literature points the negative effects of such heterogeneity. Since the used models disregards the possibility of having water in two phases, Chapter 3 describes a LBMcolorgradientcodefortwophaseflows. Wevalidateitagainstanexperimentperformed of a T-junction, a device that has applications beyond fuel cell. Chapter 4, differently, is devoted to steady gas flows in parallel channels that differ from standard fuel cell. An algorithm automatically homogenizes the fluid flow by modifying domain geometry within definite limits. It applies to diverse settings, and manages parallel channels by varying parameters as channel number and widths. However, the distributing channels that span the fluid between channels at BPP inlet and recollect it at outlet also matter. The author thus proposes designs that equalize channel flows. The author creates a new design to study the manufacturing feasibility of BPP. Chapter 5 describes water drop directional spreading on metallic structures decorated with fin shaped channels of parallel axis: experiments reveal almost total spreading only in one direction. Three dimensional LBM and Volume of Fluid simulationsretrievetheobservedtrendandcapturesmallerscaledetailssuggestingsubsetsof the fluid domain where capillary forces or inertia dominate. Most significant results are two phase flows simulations. They describe the different regimes of films or drops at the outlet of a T-junction whose other branches are fed with immiscible wetting and non-wetting fluids. Moreover, they describe how water drops spread on a microscopic relief which results into skewed capillary force
Ferrier, Renaud. "Stratégies de résolution numérique pour des problèmes d'identification de fissures et de conditions aux limites." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLN034/document.
The goal of this thesis is to study and to develop some methods in order to solve two types of identification problems in the framework of elliptical equations. As those problems are known to be particularly unstable, the proposed methods are accompanied with regularization procedures, that ensure that the obtained solutions keep a physical meaning.Firstly, we study the resolution of the Cauchy problem (boundary conditions identification) by the Steklov-Poincaré method. We start by proposing some improvements based on the used Krylov solver, especially by introducing a regularization method that consists in truncating the Ritz values decomposition of the operator in question. We study afterwards the estimation of uncertainties by the mean of techniques stemming from Bayesian inversion. Finally, we aim at solving more demanding problems, namely a time-transient problem, a non-linear case, and we give some elements to carry out resolutions on geometries that have a very high number of degrees of freedom, with help of domain decomposition.As for the problem of crack identification by the reciprocity gap method, we firstly propose and numerically test some ways to stabilize the resolution (use of different test-functions, a posteriori minimization of the gradients or Tikhonov regularization). Then we present an other variant of the reciprocity gap method, that is applicable on cases for which the measurements are incomplete. This method, based on a Petrov-Galerkin approach, is confronted, among others, with an experimental case. Finally, we investigate some ideas that allow to extend the reciprocity gap method for the identification of non-plane cracks
ROUSSEL, FABIENNE. "Simulation numerique d'ecoulements de fluides compressibles visqueux par une approche fluide parfait avec conditions aux limites de paroi modelisant la couche limite." Paris 6, 1992. http://www.theses.fr/1992PA066316.
Phan, Minh Tuyen. "Modélisation explicite de l'écaillage sous incendie du béton : approche thermo-hydro-mécanique avec des conditions aux limites évolutives." Phd thesis, Université Paris-Est, 2012. http://tel.archives-ouvertes.fr/tel-00787946.
Phan, Minh Tuyen. "Modélisation explicite de l’écaillage sous incendie du béton : approche thermo-hydro-mécanique avec des conditions aux limites évolutives." Thesis, Paris Est, 2012. http://www.theses.fr/2012PEST1155/document.
In the recent years, there were major tunnels fires which caused fatalities and severe traffic restrictions. In such extreme conditions (temperatures exceeding 1200 °C for considerable time spans), pore pressure build-up, restrained thermal dilatation, cement paste to aggregate incompatibility, dehydration... are some main degradation mechanisms of concrete that may cause its thermal spalling. Progressive concrete spalling occurring during a fire presents as the breakdown of surface layers which flake into small pebble-like pieces. Then, the resistant section of the structure reduces which may lead to its premature failure.In this thesis, a THM finite element model is enriched with a detachment-buckling type criterion for progressive spalling. The thermo-hygral part of the THM model is based on the three fluid approach for partially saturated porous media. The mechanical part is derived within the framework of thermo-poro-mechanics coupled to damage and softening plasticity.The adopted modeling of spalling leads to a problem with evolving boundary and boundary conditions. A suitable numerical solution strategy without remeshing is then developed in order to transfer properly the THM boundary conditions simultaneously with spalling occurrence.The efficiency of the model THM-Spalling is illustrated by some numerical examples and by parametric studies. These studies identify the influence, on spalling, of size variation of spalling flakes, the average spalling velocity and uncertainties on different material parameters. Confrontation with experimental tests shows satisfactory capacity of the THM-Spalling model in reproducing qualitatively the occurrence of spalling
Books on the topic "Conditions aux limites approchées":
Hoppe, Daniel Jay. Impedance boundary conditions in electromagnetics. Washington, DC: Taylor & Francis, 1995.
Senior, T. B. A., and John L. Volakis. Approximate Boundary Conditions in Electromagnetics (Ieee Electromagnetic Waves Series). Institution of Electrical Engineers, 1995.
Ida, Nathan, and Sergey V. Yuferev. Surface Impedence Boundary Conditions. CRC, 2008.
Ida, Nathan, and Sergey V. Yuferev. Surface Impedance Boundary Conditions: A Comprehensive Approach. Taylor & Francis Group, 2018.
Ida, Nathan, and Sergey V. Yuferev. Surface Impedance Boundary Conditions: A Comprehensive Approach. Taylor & Francis Group, 2018.
Ida, Nathan, and Sergey V. Yuferev. Surface Impedance Boundary Conditions: A Comprehensive Approach. Taylor & Francis Group, 2018.
Yuferev, Sergey V. Surface Impedance Boundary Conditions: A Comprehensive Approach. Taylor & Francis Group, 2010.
Book chapters on the topic "Conditions aux limites approchées":
"Conditions aux limites de Dirichlet par pénalisation - Couches limites." In Eléments d’analyse pour l’étude de quelques modèles d’écoulements de fluides visqueux incompressibles, 263–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-29819-3_6.
"Conditions aux limites en sortie d’un écoulement." In Eléments d’analyse pour l’étude de quelques modèles d’écoulements de fluides visqueux incompressibles, 245–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-29819-3_5.
"Chapitre 12 Problèmes à conditions aux limites et problèmes aux valeurs propres." In Méthodes numériques appliquées, 281–300. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0990-5-013.
"Chapitre 12 Problèmes à conditions aux limites et problèmes aux valeurs propres." In Méthodes numériques appliquées, 281–300. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-0990-5.c013.
BEN-AHMED, Sabrina, Jean-Noël ALBERTINI, Jean-Pierre FAVRE, C. Alberto FIGUEROA, Eugenio ROSSET, Francesca CONDEMI, and Stéphane AVRIL. "Simulations numériques de l’impact hémodynamique des interventions endovasculaires complexes." In Écoulements biologiques dans les grands vaisseaux, 45–70. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9065.ch2.
Bosseur, F., and P. Orenga. "Determination de Conditions Aux Limites En Mer Ouverte Par Une Methode de Controle Optimal." In Nonlinear Partial Differential Equations and their Applications - Collège de France Seminar Volume XIV, 103–32. Elsevier, 2002. http://dx.doi.org/10.1016/s0168-2024(02)80007-8.
"Deuxième partie : Enseigner et apprendre à l’ère du COVID-19 : Enjeux, défis et opportunités." In Les écoles africaines à l’ère du COVID-19, 187–90. Editions des archives contemporaines, 2024. http://dx.doi.org/10.17184/eac.7928.
"Première partie : Les écoles africaines face à la crise : Dispositif, résilience et management." In Les écoles africaines à l’ère du COVID-19, 101–4. Editions des archives contemporaines, 2024. http://dx.doi.org/10.17184/eac.7917.
Conference papers on the topic "Conditions aux limites approchées":
Sanchez, Martin. "Conditions aux limites liées à la réflexion de la houle et distribution des énergies dans un bassin portuaire." In Journées Nationales Génie Côtier - Génie Civil. Editions Paralia, 1996. http://dx.doi.org/10.5150/jngcgc.1996.004-s.
Degorce, T. "Le défaut osseux antérieur : un défi esthétique et chirurgical." In 66ème Congrès de la SFCO. Les Ulis, France: EDP Sciences, 2020. http://dx.doi.org/10.1051/sfco/20206601002.