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Direct Numerical Simulations of Converging-Diverging Channel Flow

type de publication      communication internationale avec actes publiés
date de publication 15-10-2009
auteur(s) Laval Jean-Philippe; Marquillie Matthieu
  
conférence Progress in Wall Turbulence: Understanding and Modeling
     dates de 21-04-2009 à 23-04-2009
     lieu Lille, France
     nom des actes Proceedings of the WALLTURB International Workshop held in Lille, France, April 21-23, 2009. M. Stanislas, J. Jimenez, I. Marusic Editors, ERCOFTAC Series vol. 14, Springer
  
pages 203 – 209
ISBN / ISSN 978-90-481-9602-9
résumé Two Direct Numerical Simulations (DNS) of a converging-diverging channel flows were performed at Reτ = 395 and Reτ = 617. The present DNS of adverse pressure gradient flow were designed within the WALLTURB project to meet two main objectives. The first one was to gather three-dimensional fully re- solved data in order to investigate statistics and coherent structures of turbulence under strong pressure gradient with and without curvature. The second one was to have a reference for the evaluation of RANS and LES models. The flow slightly sep- arates at the lower curved wall and is at the onset of separation at the opposite flat wall. Intense vortices are generated at the location of the minimum friction velocity even without averaged recirculation. The full budget of the Reynolds stresses were computed along the channel at both walls. The occurrence of a well documented secondary peak of velocity fluctuations due to adverse pressure gradient is shown to be the consequence of a very strong production peak.
mots clés Turbulence, DNS, Adverse Pressure Gradient
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