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Academic literature on the topic 'Interfaces (sciences physiques) – Simulation par ordinateur'
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Dissertations / Theses on the topic "Interfaces (sciences physiques) – Simulation par ordinateur"
Lardon, Isabelle. "Interaction d'une dislocation vis avec une interface cohérente : étude des forces images par simulation à l'échelle atomique." Poitiers, 1994. http://www.theses.fr/1994POIT2316.
Full textKoval, Junior Georg. "Comportement d’interface des matériaux granulaires." Paris Est, 2008. http://pastel.paristech.org/4192/01/KOVAL.pdf.
Full textIn this thesis, we analyze the interface behavior of granular materials, and particularly the phenomenon of shear strain localization in the vicinity of a wall. Using an annular geometry with imposed shear velocity and confining pressure, we compare experimental and numerical approaches to describe this behavior. The experimental approach is composed of experiments with model materials in two annular simple shear devices (ACSA and mini-ACSA). We connect measurements of shear strain of the granular medium, obtained by correlation imaging velocimetry (ACSA) and by magnetic resonance imaging (mini-ACSA) to global measurements of the stress and volume variations. The numerical approach consists of two-dimensional discrete simulations (molecular dynamics). We study the influence of the geometry and the surface roughness on the behavior of the granular interfaces. In simulation, we complete the study with the analysis of inertial effects
Wang, Hao. "Contribution à l'étude thermique des contacts périodiques solide-solide." Vandoeuvre-les-Nancy, INPL, 2000. http://www.theses.fr/2000INPL040N.
Full textAuroux, Eric. "Etude de l'adhérence de couches minces sur des substrats soumis à un choc laser." Poitiers, 1999. http://www.theses.fr/1999POIT2316.
Full textLambert-Mauriat, Caroline. "Etude expérimentale et numérique de la résistivité de composites frittés Au-YBa2Cu3Ox, en fonction de la temprature : rôle de la porosité et des interfaces." Aix-Marseille 3, 1999. http://www.theses.fr/1999AIX30014.
Full textPolitis, Konstantinos. "Développement de modèles numériques de tension superficielle pour la simulation d'écoulements avec interface à l'aide d'une formulation multi-fluides." Thesis, Ecole centrale de Nantes, 2016. http://www.theses.fr/2016ECDN0021.
Full textAir Lubrication methods are regarded by the scientific community as the next major technological breakthrough in Naval Engineering to achieve the reduction of drag in commercial vessels. The accurate modeling of the physical phenomena governing the drag reduction mechanisms of Air Lubrication methods, namely, the dynamics of surface tension, the instabilities of the air-water interfaces and air entrainment, are imperative for the design of air-lubricated hulls. To that end, we have implemented to ISIS-CFD several programming tools, interface reconstruction schemes and surface tension modeling. Two new surface tension methods were developed. Both use a global interface reconstruction scheme and are coupled with the compressive discretization volume fraction schemes for the unstructured finite volume formulation that the flow solver ISIS-CFD is based on. The results demonstrate that complicated dynamic interactions of either a single or multiple interfaces can be accurately captured. In the context of a future research study, the proposed approaches could lead to the further enhancement of the modeling capabilities of ISISCFD by introducing a macroscopic air entrainment model and eventually the assessment of different physical effects encountered in lubricated naval vessels using ISIS-CFD
Boëdec, Gwenn. "Modélisation d'une vésicule sous forçage hydrodynamique." Thesis, Aix-Marseille 3, 2011. http://www.theses.fr/2011AIX30025.
Full textVesicles are drops of radius of a few tens micrometers, bounded by an impermeable lipidmembrane of approximately 4 nm thickness, and embedded in an external viscous fluid. Thevesicle membrane is an original system from the mechanical point of view : it presents bothincompressible fluid properties (the lipids can flow freely along the membrane, but membraneis incompressible locally) and solid properties (the membrane resists to bending). The specificproperties of the membrane make the system very deformable and very constrained at the sametime.This manuscript deals with the modelisation of a vesicle subjected to external stresses of hydrodynamical origin, in the Stokes regime. A particular attention is paid to the situation of asettling vesicle. This situation is studied analytically in the small deformation regime. It is foundthat several families of non-trivial stationnary shapes exist, owing to the specific properties ofthe membrane. The study of a settling vesicle is pursued by the development of a numerical codeable to deal with large deformations. Original numerical methods are developped to deal with thecomputation of the bending and with the surface incompressibility constraint. This code permitsto study the formation of tether at the rear of a settling vesicle. These tethers are thin (typicalaspect ratio : length/radius ∼ 100) cylinders of membrane connected to the original vesicle. Itis shown that these tethered shapes are stationary shapes. A theoretical model is proposed andcompared to numerical simulations. This model shows the particular importance of tension inthese shapes. A mechanical modelling based on a curved Cosserat surface is also presented, andpermits to identify the bending contribution to the stress tensor. This contribution is a salientingredient to understand tethered shapes
Courbon, Cédric. "Vers une modélisation physique de la coupe des aciers spéciaux : intégration du comportement métallurgique et des phénomènes tribologiques et thermiques aux interfaces." Phd thesis, Ecole Centrale de Lyon, 2011. http://tel.archives-ouvertes.fr/tel-00713527.
Full textSalamone, Salvatore. "Propriétés physiques des empilements de fibres macroscopiques : une approche expérimentale, théorique et numérique." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAE007/document.
Full textThe purpose of this work is to understand how intrinsic shape of individual fibers controls the collective behavior of fiber stacks, in particular the mechanical (elasticity) and electrical properties. We consider long fibers, aligned towards one preferential direction with a significant disorder shape. Our study is experimental and numerical. We propose a two dimensions self consistent mean field model which describes the collective elasticity from the individual properties of fibers : the disorder distribution and the bending modulus. We obtain an equation of state which describes with a good agreement the stacks elasticity, without any fit parameters, however up to a multiplicative constant. We obtain similar results between experimental and numerical studies
Mahdjoubi, Cyrus. "Description et simulation de systemes physiques complexes controles par grafcet." Rennes, INSA, 1987. http://www.theses.fr/1987ISAR0014.
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