Abo Bibliothek: Guest
Fourth International Symposium on Turbulence and Shear Flow Phenomena
June, 27-29, 2005, Marriot Hotel, Williamsburg, Virginia, USA

DOI: 10.1615/TSFP4

RANS/LES COUPLING USING A FORCING TERM APPROACH

pages 1141-1146
DOI: 10.1615/TSFP4.1900
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ABSTRAKT

In nuclear industry the relevant flows are often wall bounded, characterized by a high Reynolds number turbulence and a strong unsteadiness. In order to develop an advanced numerical modeling that takes into account these features while extending on a large enough spatial flow configuration to be relevant for industrial goals, we start focusing on a methodology of coupling based on the following idea: we want to couple regions where standard fine resolved LES is used with regions resolved in the framework of RANS/LES coupling. This latter is considered here as full 3D unsteady simulations providing reasonable and accurate numerical solution with an affordable computational effort when compared to standard RANS modeling. The paper is devoted to this RANS/LES coupling method, based on the application of a forcing term and provides results on a first validation test on a fully and very coarse mesh. All the computations of this study were performed with the TRIO_U code developed at CEA (French Atomic Center) Grenoble. The RANS/LES coupling method applied in this study ensures a mean profile as correct as the RANS computation and an improvement for the fluctuations profiles compared to LES on coarse grid without forcing term.

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