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SIMULATIONS 3D NON-STATIONNAIRES DÉDIÉES À L'INVESTIGATION DE PROCESSUS DE SÉDIMENTATION À FORTE DYNAMIQUE

Abstract : The behavior of a rigid spherical particle immersed in a
viscous newtonian fluid is reproduced by means of
Direct Numerical Simulation. The first step consists in
introducing a 1-Fluid model coupled with
a viscosity-based penalty method.
Several computational techniques are then associated
for solving the problems inherent to the strong physical
constraints. Through the next step, our approach is
assessed to by several test-cases based on an
exhaustive bibliography of both two and
three-dimensional flows, for Stokes and Oseen
regimes. With original experimental and numerical
results obtained through a scientific collaboration, our
numerical experiments are then systematically
validated relative to PIV fields for inertial regimes.
Finally, our investigation focuses on a critical flow
regime with simulations leading to instabilities,
indicating the transitions that tend to chaotic wakes
and trajectories.
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https://tel.archives-ouvertes.fr/tel-00110838
Contributor : Grégoire Pianet <>
Submitted on : Wednesday, November 1, 2006 - 10:18:51 PM
Last modification on : Thursday, January 11, 2018 - 6:20:34 AM
Long-term archiving on: : Thursday, September 20, 2012 - 2:15:09 PM

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  • HAL Id : tel-00110838, version 1

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Grégoire Pianet. SIMULATIONS 3D NON-STATIONNAIRES DÉDIÉES À L'INVESTIGATION DE PROCESSUS DE SÉDIMENTATION À FORTE DYNAMIQUE. Dynamique des Fluides [physics.flu-dyn]. Université Sciences et Technologies - Bordeaux I, 2005. Français. ⟨tel-00110838⟩

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