Large-eddy simulation study of upstream boundary conditions influence upon a backward-facing step flow

Jean-Luc Aider; Alexandra Danet

doi:10.1016/j.crme.2006.05.004

Large-eddy simulation study of upstream boundary conditions influence upon a backward-facing step flow

Presented by: Marcel Lesieur

Jean-Luc Aider ^1,² ; Alexandra Danet ^1,³

¹ PSA Peugeot-Citroën, Research and Innovation Department, route de Gisy, 78943 Vélizy-Villacoublay, France
² Laboratoire PMMH, ESPCI, 10, rue Vauquelin, 75231 Paris cedex 05, France
³ LEGI, équipe MoST, BP 53, 38041 Grenoble cedex 09, France

Comptes Rendus. Mécanique, Volume 334 (2006) no. 7, pp. 447-453.

Abstract
Résumé

We use Large Eddy Simulation to investigate the influence of upstream boundary conditions on the development of a backward facing step flow. The first inlet condition consists of a mean turbulent boundary layer velocity profile perturbed by a white noise. The second relies upon a precursor calculation where the development of a quasi-temporal turbulent boundary layer is simulated. In this case, the quasi-longitudinal vortices in the upstream turbulent boundary-layer trigger the destabilization of the shear layer just behind the step, resulting in a shortening of the recirculation length and an increase of the characteristic frequency associated to the Kelvin–Helmholtz vortices. The mean flow and the characteristic frequencies of pressure fluctuations are strongly dependent of the upstream flow. It demonstrates the importance of realistic boundary conditions for the simulation of complex 3D flows or for flow control simulations.

On étudie grâce à la simulation des grandes échelles l'influence des conditions aux limites amont sur l'écoulement en aval d'une marche descendante. La première condition consiste à ajouter un bruit blanc (BB) à un profil de vitesse de couche limite turbulente. La seconde s'appuie sur un calcul précurseur (CP) où on simule le développement d'une couche limite turbulente quasi-périodique. Dans ce dernier cas, les tourbillons quasi-longitudinaux de la couche limite amont provoquent une déstabilisation précoce de la couche de mélange en aval de la marche. Ceci conduit à une réduction de la longueur de recirculation et à une modification des fréquences caractéristiques. La fréquence associée aux tourbillons de Kelvin–Helmholtz est nettement augmentée. Ces résultats soulignent l'importance des conditions aux limites amonts pour la simulation d'écoulements 3D complexes et pour les problèmes de contrôle d'écoulement.

Received: 2006-05-10
Accepted: 2006-05-16
Published online: 2006-06-30

DOI: 10.1016/j.crme.2006.05.004

Keywords: Computational fluid mechanics, Turbulence, Backward facing step, Large eddy simulation
Mots-clés : Mécanique des fluides numérique, Turbulence, Marche descendante, Simulation des grandes echelles

Author's affiliations:

Jean-Luc Aider ^{1, 2}; Alexandra Danet ^{1, 3}

¹ PSA Peugeot-Citroën, Research and Innovation Department, route de Gisy, 78943 Vélizy-Villacoublay, France
² Laboratoire PMMH, ESPCI, 10, rue Vauquelin, 75231 Paris cedex 05, France
³ LEGI, équipe MoST, BP 53, 38041 Grenoble cedex 09, France

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     author = {Jean-Luc Aider and Alexandra Danet},
     title = {Large-eddy simulation study of upstream boundary conditions influence upon a backward-facing step flow},
     journal = {Comptes Rendus. M\'ecanique},
     pages = {447--453},
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     number = {7},
     year = {2006},
     doi = {10.1016/j.crme.2006.05.004},
     language = {en},
}

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Jean-Luc Aider; Alexandra Danet. Large-eddy simulation study of upstream boundary conditions influence upon a backward-facing step flow. Comptes Rendus. Mécanique, Volume 334 (2006) no. 7, pp. 447-453. doi : 10.1016/j.crme.2006.05.004. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2006.05.004/

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