Génération et adaptation de maillage volume-couche limite dynamique pour les écoulements turbulents autour de géométries complexes

Abstract : Numerical simulation of turbulent aerodynamics flows remains challenging. Such fluid-structure interaction problem involves generally a thin layer close to the wall where the fluid is slow down, called boundary layer. This latter requires a carefull study of the boundary layer since it is crucial regarding the accuracyof the complete flow computation. Therefore, a fine and structured mesh is needed close to the wall. In this work, we propose a novel automatic procedure to build a correct boundary layer mesh according to the theory and the flow parameters. Moreover, in order to describe exactly the behaviour of the flow on the whole domain, the boundary layer mesh is combined with a dynamic mesh adaptation method.It follows an advanced version of the edge based mesh adaptation method. Combined together, they ensure a fine and structured mesh in the boundarylayer while all the flow vortices are accurately resolved. This new method, called boundary-volume mesh adaptation, has been validated on several 2D and 3Dtest cases with complex geometries. Results emphasises the capacity ofthe approach and offer opportunities of improvement for numerical fluid mechanics mesh adaptation.
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  • HAL Id : tel-01712438, version 1

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Laure Billon. Génération et adaptation de maillage volume-couche limite dynamique pour les écoulements turbulents autour de géométries complexes. Mécanique des fluides [physics.class-ph]. PSL Research University, 2016. Français. ⟨NNT : 2016PSLEM077⟩. ⟨tel-01712438⟩

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