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Simulation numérique d'écoulements autour de corps non profilés par des modèles de turbulence hybrides et un schéma multirate

Abstract : This work is a contribution to the numerical simulation of turbulent flows around bluff bodies. After specifying the numerical ingredients and the turbulence models used in our simulations, we present a study on the impact of the dynamic sub-grid scale modeling in VMS-LES model and a RANS/VMS-LES hybrid turbulence approach. Simulations of flows around a cylinder and a tandem are performed. Next, we assess the behaviour of some hybrid turbulence models for the simulation of flows around a circular cylinder in the subcritical regime. The computation of the flow around a rectangular cylinder with the VMS-LES approach is also presented. At last, after a review of some important works on multirate time advancing schemes, we propose a new volume-agglomeration explicit multirate approach that is applied to the computation of complex turbulent flows by a hybrid turbulence model.
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https://tel.archives-ouvertes.fr/tel-01930779
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Submitted on : Thursday, November 22, 2018 - 11:55:06 AM
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Emmanuelle Itam. Simulation numérique d'écoulements autour de corps non profilés par des modèles de turbulence hybrides et un schéma multirate. Modélisation et simulation. Université Montpellier, 2017. Français. ⟨NNT : 2017MONTS049⟩. ⟨tel-01930779⟩

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