Academic literature on the topic 'Maillage d'interface'
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Journal articles on the topic "Maillage d'interface":
Bec, Cosette. "Suivi d'interface en maillages non structurés." Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics 328, no. 6 (June 2000): 501–4. http://dx.doi.org/10.1016/s1620-7742(00)00032-5.
Dissertations / Theses on the topic "Maillage d'interface":
El, gharbi Yannis. "Une approche à deux niveaux pour le calcul de structures haute performance : décomposition -- maillage -- résolution." Thesis, université Paris-Saclay, 2021. http://www.theses.fr/2021UPAST001.
Numerical simulations represent a minor part of the certification proceess for critical parts in the industry. However, it would result in significant cost savings during conception phases, avoiding expensive real tests.Indeed, in cases of localized strong heterogeneities across all the structure, it becomes hard, if not impossible, to run successfully these simulations in reasonable times because of a too large number of unknowns needed for a reliable answer of the structure.To obtain this answer, large scale parallel solving methods are necessary. Domain decomposition methods, which are part of it, are the ones investigated during this thesis.The goal is to make these simulations possible thanks to domain decomposition methods.Indeed, the resolution of the problem but also the meshing of the structure become expensive and the use of parallel methods becomes essential.For this purpose, a two-level substructuring method is proposed. It aims at producing, during the pre-processing step, regular-shaped and homogeneous subdomains possibly meshed in parallel. In addition, it allows to a significant reduction of the condition number for strongly heterogeneous problems solved by a FETI solver. A mixed domain decomposition method with a two-level Robin condition which is adapted to this decomposition could then be developped.The long term objective is to deal with problems with a quasi-industrial complexity like computations at the global structural scale with multi-scale materials such as tridimensional woven composites which are used increasingly intensively in the aeronautical industry for instance
Tachon, Loic. "DEVELOPPEMENT D'OUTILS NUMERIQUES ET EXPERIMENTAUX DEDIES A L'ETUDE DE L'EVAPORATION EN PRESENCE DE LIGNE TRIPLE." Phd thesis, Université de Provence - Aix-Marseille I, 2011. http://tel.archives-ouvertes.fr/tel-00629921.
Legentil, Capucine. "Insertion d'interfaces dans des géomodèles 3D : des maillages aux simulations numériques." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0037.
Numerical subsurface models allow to understand the organization of structures and are adapted to simulate physical processes in order to study and predict the physical behavior of the subsurface. The equations describing the physical phenomena are solved using a discretization of space: the mesh. In the course of subsurface modeling projects, one often needs to revise an existing interpretation, integrate new spatial data, and perturb a geomodel to reflect subsurface uncertainty and to ultimately reduce this uncertainty using inversion methods. In this thesis, I developed a mesh-based approach for local updating of meshed geomodels 2D and 3D. Local modifications are performed in a particular region of the model by changing the unstructured meshes of geomodels. In particular, we focused on the insertion of lines and interfaces representing horizons or fractures. During the modifications of the meshes, a particular attention is given to the mesh quality, especially near the intersections between interfaces, in order to maintain a conformal and valid mesh for numerical simulations. In order to compare the impact of local modifications on physical simulations, I present three examples of application of this method: (1) wave propagation for the detection of a fluid contact on a 2D section, (2) the impact evaluation of a 2D fracture network structure on fluid flows in a porous medium, and (3) the impact of structural uncertainties in a 3D reservoir for the injection and ce{CO2} storage. I show that my method of local modifications (1) allows to insert interfaces in 2D and 3D models while keeping the conformity and validity of the meshes for numerical simulations, (2) shows a great flexibility to adapt to simulators of various physical phenomena, and (3) can be used in an inversion process to reduce uncertainties
Tachon, Loïc. "Développement d'outils numériques et expérimentaux dédiés à l'étude de l'évaporation en présence de ligne triple." Thesis, Aix-Marseille 1, 2011. http://www.theses.fr/2011AIX10027/document.
The tasks fulfilled during this study aim at providing tools for understanding the mechanisms of liquid film evaporation. Evaporation in the presence of a triple lines is ruled by physical mechanisms acting on these singularities as well as on the gas liquid interfaces. Thus, the interface description, under it numerical as experimental aspects, is a key point of this study. A numerical tridimentionnal sharp interface tracking tool has been developed to be used in further numerical simulation of the evaporation problem. In this algorithm, the interface is described as a quadratic grid surface. Its convergence orders relatively to geometrical parameters of the interface (curvature, normal, position) has been studied.In the mean time, an experimental optical inversion technique has been developed and validated. It allows a dynamic measurement of the interface shape in the vicinity of the triple line of highly wetting fluid. This method has been applied to the case of a quasi axisymetric evaporating film and provides a first quantification of the heat and mass transfers generated by the triple line region
Saas, Laurent. "Décomposition de domaine et schémas volumes finis sur maillages non-conformes." Paris 6, 2004. http://www.theses.fr/2004PA066493.
Regnault, Paul. "Front-Tracking mesh adaptation for the simulation of two-phase flows with coalescence and breakup." Electronic Thesis or Diss., Université Gustave Eiffel, 2023. http://www.theses.fr/2023UEFL2076.
In the context of two-phase flows with separated phases, this work focuses on dynamic management of the interface mesh (made up of connected triangles in 3D) and its impact on the approximation of geometrical properties that are position and curvature. The conservation equations of fluid mechanics are solved on fixed, staggered and structured grids. The interface is tracked in a Lagrangian fashion with a moving and deformable mesh: this method is known as the"Front-tracking" method. In addition to classical remeshing operations (edgesplitting, collapsing and swapping for instance), we will study the adaptation of the mesh to the curvature of the interface and the use of polynomial approximation to improve edge splitting and collapsing. These methods are evaluated on analytical, mobile and deformable surfaces, with neither the resolution of the Navier-Stokes equations nor topological changes. In two-phaseflows, topological changes may happen: coalescence and breakup. We propose a method for coalescence and a method for breakup. These two methods are activated by distance criteria and rely only on the interface mesh, without resorting to the Eulerian mesh. These methods are employed on numerical and experimental configurations from the literature to appreciate their robustness and performances
Barrau, Nelly. "Généralisation de la méthode Nitsche XFEM pour la discrétisation de problèmess d'interface elliptiques." Thesis, Pau, 2013. http://www.theses.fr/2013PAUU3025/document.
This thesis focuses on the generalization of the NXFEM method proposed by A. and P. Hansbo for elliptic interface problem. Numerical modeling and simulation of flow in fractured media are at the heart of many applications, such as petroleum and porous media (reservoir modeling, presence of faults, signal propagation, identification of layers ...), aerospace (problems of shock, rupture), civil engineering (concrete cracking), but also in cell biology (deformation of red blood cells). In addition, many research projects require the development of robust methods for the consideration of singularities, which is one of the motivations and objectives of the Concha team and of this thesis. First a modification of this method was proposed to obtain a robust method not only with respect to the mesh-interface geometry, but also with respect to the diffusion parameters. We then looked to its generalization to any type of 2D-3D meshes (triangles, quadrilaterals, tetrahedra, hexahedra), and for any type of finites elements (conforming, nonconforming, Galerkin discontinuous) for plane and curved interfaces. The applications have been referred to the flow problems in fractured porous media : adaptation of NXFEM method to solve an asymptotic model of faults, to unsteady problems, transport problems, or to multi-fractured domains
Zerguine, Walid. "Adaptation de maillages anisotropes et écoulements multifluides : Applications en injection assistée eau." Paris, ENMP, 2010. http://www.theses.fr/2010ENMP0082.
The Water Assisted Injection Molding (WAIM) is a recent manufacturing process that produces thermoplastic hollow parts. Numerical simulation is an important step in the development of this innovative technology. The framework of the thesis is the development of a numerical simulation module for the WAIM process. The industrial and technological benefits of this numerical tool will provide crucial information on the sensitivity of the properties of injection molded parts to injection conditions. The hydrodynamics of the multiphase polymer-water-air system is described by the resolution of the Navier-Stokes equations within the framework of an eulerian monolithic formulation. The method consists in solving the system of equations on a single mesh. A distance function allows to describe the interfaces water-polymer and polymer-air to supply the physical properties of every sub-domain. A strategy of anisotropic dynamic mesh adaptation allows to decrease the strong heterogeneities of the phases in presence. Two ways are investigated. The first one considers meshes constructed from a priori metrics based on the gradient of the Levelset function and the second approach considers the construction of a metric based on a posteriori error estimator minimizing the error of approximation under constraint to keep a constant number of elements. A confrontation in experimental trials confirms the relevance of our tool to predict the evolution of the water vein in a typical WAIM part
Barrau, Nelly. "Généralisation de la méthode Nitsche XFEM pour la discrétisation de problèmes d'interface elliptiques." Phd thesis, Université de Pau et des Pays de l'Adour, 2013. http://tel.archives-ouvertes.fr/tel-00913387.
Delage, Santacreu Stéphanie. "Méthode de raffinement de maillage adaptatif hybride pour le suivi de fronts dans des écoulements incompressibles." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2006. http://tel.archives-ouvertes.fr/tel-00012193.
la taille mémoire. On montre au travers de cas d'étude 2D et 3D, judicieusement choisis, l'efficacité de cette méthode.