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Academic literature on the topic 'Méthodes de maillage non adaptées'
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Journal articles on the topic "Méthodes de maillage non adaptées"
GBENOU, Gérard Xavier, Mohamed Habibou ASSOUMA, Nouhoun ZAMPALIGRE, Cécile MARTIN, Denis BASTIANELLI, Laurent BONNAL, Timbilfou KIENDREBEOGO, et al. "Mesurer, prédire et réduire les émissions de méthane entérique en Afrique subsaharienne." INRAE Productions Animales 37, no. 1 (April 26, 2024): 7648. http://dx.doi.org/10.20870/productions-animales.2024.37.1.7648.
Full textAslain Brisco, Ngnassi Djami, Nzié Wolfgang, and Doka Yamigno Serge. "Facteurs Limitants l'Application des Méthodes de Conception Adaptées a l'Usage dans le Contexte des Pays du Sud: Cas du Cameroun." European Scientific Journal, ESJ 18, no. 33 (October 31, 2022): 263. http://dx.doi.org/10.19044/esj.2022.v18n33p263.
Full textGabiola, Esther. "regard sur les compétences socioculturelles à partir du traitement de l'Erasmus + dans les méthodes de FLE, niveau B2." Langues & Parole 6 (December 22, 2021): 251–69. http://dx.doi.org/10.5565/rev/languesparole.75.
Full textGassmann. "Geräteeinstellung in der bildgebenden Ultraschall-Dopplerdiagnostik (Spektral- und Farb-Doppler)." Praxis 91, no. 16 (April 1, 2002): 677–84. http://dx.doi.org/10.1024/0369-8394.91.16.677.
Full textStange, Marion. "Governing the Swamp: Health and the Environment in Eighteenth-Century Nouvelle-Orléans." French Colonial History 11 (May 1, 2010): 1–21. http://dx.doi.org/10.2307/41938195.
Full textTopie, Emmanuel. "Identifier les animaux suspects d’être atteints par une maladie transmissible chez le chien et le chat." Le Nouveau Praticien Vétérinaire canine & féline 18, no. 80 (2021): 8–10. http://dx.doi.org/10.1051/npvcafe/80008.
Full textEgo, A., C. Prunet, E. Lebreton, B. Blondel, M. Kaminski, F. Goffinet, and J. Zeitlin. "Courbes de croissance in utero ajustées et non ajustées adaptées à la population française. I – Méthodes de construction." Journal de Gynécologie Obstétrique et Biologie de la Reproduction 45, no. 2 (February 2016): 155–64. http://dx.doi.org/10.1016/j.jgyn.2015.08.009.
Full textLabbé, Grégoire. "Sur quelles bases enseigner l’intercompréhension entre les langues slaves de l’ouest et du sud-ouest?" Journal for Foreign Languages 9, no. 1 (December 28, 2017): 191–200. http://dx.doi.org/10.4312/vestnik.9.191-200.
Full textChambrion, Cyril, Frédéric Chevallier, Joël Vionnet Fuasset, Bruno Senebier, Sophie de Smedt, Julien Lebreton, and Philippe Boisnault. "État des lieux des soins non programmés en soins primaires. Une étude descriptive prospective dans le Vexin." Santé Publique Prépublications (January 1, 2025): I46—IX. http://dx.doi.org/10.3917/spub.pr2.0046.
Full textBourgin, Pierre-Yves. "Modèle intégré du fonctionnement hydrologique du bassin versant du Sassandra." La Houille Blanche, no. 5-6 (December 2019): 124–39. http://dx.doi.org/10.1051/lhb/2019024.
Full textDissertations / Theses on the topic "Méthodes de maillage non adaptées"
Ramière, Isabelle. "Méthodes de domaine fictif pour des problèmes elliptiques avec conditions aux limites générales en vue de la simulation numérique d'écoulements diphasiques." Phd thesis, Université de Provence - Aix-Marseille I, 2006. http://tel.archives-ouvertes.fr/tel-00122916.
Full textL'originalité de ces méthodes consiste à utiliser le maillage du domaine fictif, généralement non adapté à la géométrie du domaine physique, pour définir une frontière immergée approchée sur laquelle seront appliquées les conditions aux limites immergées. Un même schéma numérique générique permet de traiter toutes les conditions aux limites générales. Ainsi, contrairement aux approches classiques de domaine fictif, ces méthodes ne nécessitent ni l'introduction d'un maillage surfacique de la frontière immergée ni la modification locale du schéma numérique. Deux modélisations de la frontière immergée sont étudiées. Dans la première modélisation, appelée interface diffuse, la frontière immergée approchée est l'union des mailles traversées par la frontière originelle. Dans la deuxième modélisation, la frontière immergée est approchée par une interface dite fine s'appuyant sur les faces de cellules du maillage. Des conditions de transmissions algébriques combinant les sauts de la solution et du flux sont introduites sur cette interface fine. Pour ces deux modélisations, le problème fictif à résoudre ainsi que le traitement des conditions aux limites immergées sont détaillés. Un schéma aux éléments finis Q1 est utilisé pour valider numériquement le modèle à interface diffuse alors qu'un nouveau schéma aux volumes finis est développé pour le modèle à interface fine et sauts immergés. Chaque méthode est combinée avec un algorithme de raffinement de maillage multi-niveaux (avec résidu de solution ou du flux) autour de la frontière immergée afin d'améliorer la précision de la solution obtenue.
Parallèlement, une analyse théorique de convergence en maillage non adapté au domaine physique a été effectuée pour une méthode d'éléments finis Q1. Cette étude démontre l'ordre de convergence des méthodes de domaine fictif mises en place.
Parmi les nombreuses applications industrielles possibles, une simulation sur une maquette d'échangeur de chaleur dans les centrales nucléaires permet d'apprécier la performance des méthodes mises en oeuvre.
Corti, Daniele Carlo. "Numerical methods for immersed fluid-structure interaction with enhanced interfacial mass conservation." Electronic Thesis or Diss., Sorbonne université, 2024. http://www.theses.fr/2024SORUS176.
Full textThe present thesis is dedicated to the modeling, numerical analysis, and simu- lation of fluid-structure interaction problems involving thin-walled structures immersed in incompressible viscous fluid. The underlying motivation behind this work is the simulation of the fluid-structure interaction phenomena involved in cardiac valves. From a methodological standpoint, special focus is placed on unfitted mesh methods that guarantee accuracy without compromising computational complexity. An essential aspect is ensuring mass conservation across the fluid-structure interface. An extension of the unfitted mesh Nitsche-XFEM method reported in Alauzet et al. (2016) to three dimensions is first pro- posed, addressing both fully and partially intersected fluid domains. To achieve this, a robust general tessellation algorithm has been developed without relying on black-box mesh generators. Additionally, a novel approach for enforcing continuity in partially intersected domains is introduced. However, in situations involving contact phenomena with multiple interfaces, the computational implementation becomes exceedingly complex, particularly in 3D. Subsequently, an innovative low-order fictitious domain method is introduced, which mitigates inherent mass conservation issues arising from continuous pressure approximation by incorporating a single velocity constraint. A comprehensive a priori error analysis for a Stokes problem with a Dirichlet constraint on an immersed interface is provided. Finally, this fictitious domain approach is formulated within a fluid-structure interaction framework with general thin-walled solids and successfully applied to simulate the dynamics of the aortic valve
Leterrier, Nikos. "Discrétisation spatiale en maillage non-structuré de type général." Paris 6, 2003. http://www.theses.fr/2003PA066192.
Full textSchönfeld, Thilo. "Méthodes de raffinement adaptatif de maillage pour le calcul des écoulements non-visqueux tridimensionnels." Toulouse, INPT, 1993. http://www.theses.fr/1993INPT052H.
Full textBurbeau, Anne. "Méthodes de Galerkine discontinu d'ordre élevé pour la simulation instationnaire en maillage non structuré." Bordeaux 1, 2000. http://www.theses.fr/2000BOR10608.
Full textMer, Katherine. "Modèles de viscosités du quatrième ordre pour l'advection-diffusion en maillage non-structuré." Nice, 1996. http://www.theses.fr/1996NICE5048.
Full textGendre, Félix. "Développement de méthodes de Boltzmann sur réseau en maillages non-uniformes pour l'aéroacoustique automobile." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0196/document.
Full textThe main goal of this work is to study the capacities of the Lattice Boltzmann Method in a constrained numerical framework : that of numerical simulation in automotive aeroacoustics with non-uniform meshes, at high Reynolds number and non egligible Mach number (Ma > 0.1). The industrial problem is the computation of the interior aerodynamic noise, which includes as its first decisive step the computation of the unsteady wall pressure field on the car windows. It was observed that a lack of precision on the weak acoustic part of the total pressure field on the driver-side window, which is most probably due to errors at mesh refinement interfaces, caused an overestimation of the interior noise. We first present a coherent and unified construction of the Lattice BoltzmannMethod from the Boltzmann equation, in an athermal weakly compressible framework. Then, we study in details the aeroacoustic properties of the LBM by reviewingall the main families of collisional operators that exist in the literature. A variant of multiple relaxation time operator that can be used for aeroacoustics is presented and tested. A simplified alternative selective filter, fast and compact, is developped and numerically validated. The problem of non-uniform meshes is discussed. An exhaustive review of the LBM studies that have been carried out within that framework shows that none of them corresponds to our constraints. Alternative transition nodes algorithms are developed. Finally, all the developed models of this work are applied to industrial cases
Poret, Maud. "Méthodes en maillages mobiles auto-adaptatifs pour des systèmes hyperboliques en une et deux dimensions d'espace." Phd thesis, Ecole des Ponts ParisTech, 2005. http://pastel.archives-ouvertes.fr/pastel-00001053.
Full textColle, Anthony. "Méthodes numériques sans maillage pour la résolution de la fragmentation en dynamique rapide." Electronic Thesis or Diss., Toulouse, INSA, 2019. http://www.theses.fr/2019ISAT0052.
Full textIn Aeronautics, Defense and Space, dynamic fragmentation is a process generated by extreme loadings. Among the Lagrangian approaches, classically used for the modeling of such events, we focus here on the meshless method called SPH. Unlike grid-based methods, SPH is built on a set of interpolation points disregarding any connectivity which makes it naturally well suited to handle material failure. However, standard SPH schemes suffer from instabilities questioning their accuracy and activating non-physical processes such as numerical fragmentation. A new robust SPH scheme called γ-SPH-ALE is then proposed in this work. It is built in an ALE context and includes a stabilizing low-Mach scheme inherited from Finite Volume methods. Through a nonlinear stability analysis, CFL conditions are identified on the scheme parameters. A strong mathematical background is then built ensuring the scheme conservativity, robustness, stability and consistency. To our knowledge, this type of nonlinear analysis has never been performed on a SPH-ALE scheme. Finally, the implementation of γ-SPH-ALE on various academic fragmentation test cases demonstrates particularly its capability to prevent spurious oscillations to appear in elastic waves, as well as to solve the so-called tensile instability, major issues of standard SPH methods. Also, taking advantage of GPU parallelization, these results are achieved in reduced computation times with respect to conventional CPU implementations
Zaytsev, Victor. "Méthodes stochastiques pour la modélisation d'incertitudes sur les maillages non structurés." Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM094/document.
Full textSimulations of physical phenomenon often require discretizing the medium with a mesh. An example of this type of simulation is the simulation of fluid flow through a porous medium and the evaluation of the geomechanical stress in the petroleum reservoir. The studied medium is often not homogeneous and applying a homogeneity hypothesis can lead to incorrect simulation results. That makes simulation of heterogeneities important for this kind of problems.This thesis is devoted to geostatistical simulations of heterogeneities on unstructured grids using methods of non-linear geostatistics. The objective of this work is the development of algorithms for simulating heterogeneities directly on unstructured grids without using intermediate fine scale regular grids and upscaling. We present two theoretical models for geostatistical simulations of continuous parameters on unstructured grids which are different generalizations of the Discrete Gaussian model (DGM) – DGM 1 and DGM 2. The proposed theoretical models enable converting the problem of geostatistical simulation on an unstructured grid into the well-studied problem of simulating multivariate Gaussian random vectors followed by application of block-dependent transformation functions. The problem of simulating facies is also addressed in this work, for which generalizations of pluri-Gaussian and truncated Gaussian simulation models for unstructured grids are proposed.An application of the proposed methods is demonstrated on a case study X, which is an offshore gas reservoir with a tartan-meshed grid