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Application du couplage RANS/LES aux écoulements turbulents à haut nombre de Reynolds de l'industrie nucléaire

Abstract : The main issue to perform a computational study of high Reynolds numbered turbulent flows consists on predicting their unsteadiness without implying a tremendous computational cost. First, the main drawbacks of large-eddy simulation with standard wall model on a coarse mesh for a plane channel flow are highlighted. To correct these drawbacks two coupling RANS/LES methods have been proposed. The first one relies on a sophisticated wall model (TBLE) which consists on solving Thin Boundary Layer Equations with a RANS type turbulent closure in the near wall region. The second one consists on a RANS/LES methods have been proposed. The second one consists on a RANS/LES coupling method using a forcing term approach. These various approaches have been implemented in the TRIO_U code developed at CEA (French Atomic Center) at Grenoble, France. The studied flow configurations are the fully developed plane channel flow and a flow aroound a surface-mounted cubical obstacle. Both approaches provide encouraging results and allow a surface-mounted cubical obstacle. Both approaches provide encouraging results and allow unsteady simulations for a low computational cost.
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https://tel.archives-ouvertes.fr/tel-00011371
Contributor : Younes Benarafa <>
Submitted on : Friday, January 13, 2006 - 6:32:15 AM
Last modification on : Friday, May 29, 2020 - 3:57:25 PM
Long-term archiving on: : Saturday, April 3, 2010 - 7:23:44 PM

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  • HAL Id : tel-00011371, version 1

Citation

Younes Benarafa. Application du couplage RANS/LES aux écoulements turbulents à haut nombre de Reynolds de l'industrie nucléaire. Dynamique des Fluides [physics.flu-dyn]. Université Pierre et Marie Curie - Paris VI, 2005. Français. ⟨tel-00011371⟩

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