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Conception et mise en oeuvre de méthodes vortex hybrides-frontières immergées pour des milieux solides-fluides-poreux. Application au contrôle passif d'écoulements.

Abstract : In this work we use a hybrid vortex penalization method (HVP) to simulate incompressibleflows past bluff bodies in complex solid-fluid-porous media. In this hybrid particle approach,the advection phenomenon is modeled through a vortex method in order to benefit from thenatural description of the flow supplied by particle methods and their low numerical diffusionfeatures. A particle remeshing is performed systematically on an underlying Cartesian grid inorder to prevent distortion phenomena. On the other hand, the viscous and stretching effects aswell as the velocity calculation are discretized on the mesh through Eulerian schemes. Finally,the treatment of boundary conditions is handled with a penalization method that is well suitedfor the treatment of solid-fluid-porous media.The HVP method is applied to passive flow control. This flow control study is realized pasta 2D semi-circular cylinder and a 3D hemisphere by adding a porous layer on the surface of thebody. The presence of such porous layer modifies the characteristics of the conditions at theinterfaces and leads to a regularization of the wake and to a decrease of the aerodynamic dragof the controlled obstacle. Through parametric studies on the permeability, the thickness andthe position of the porous coating, this works aims to identify efficient control devices for flowsaround obstacles like the rear-view mirrors of a ground vehicle.
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https://tel.archives-ouvertes.fr/tel-01178939
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Submitted on : Tuesday, July 21, 2015 - 12:22:05 PM
Last modification on : Tuesday, October 19, 2021 - 11:12:55 PM
Long-term archiving on: : Thursday, October 22, 2015 - 10:51:28 AM

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  • HAL Id : tel-01178939, version 1

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Chloé Mimeau. Conception et mise en oeuvre de méthodes vortex hybrides-frontières immergées pour des milieux solides-fluides-poreux. Application au contrôle passif d'écoulements.. Mathématiques générales [math.GM]. Université Grenoble Alpes, 2015. Français. ⟨NNT : 2015GREAM018⟩. ⟨tel-01178939⟩

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