Title: An investigation of hybrid LES/RANS models for predicting flow fields with separation

Authors: K. Abe, Y. Miyata

Addresses: Department of Aeronautics and Astronautics, Kyushu University, Motooka, Nishi-ku, Fukuoka 819-0395, Japan. ' Department of Aeronautics and Astronautics, Kyushu University, Motooka, Nishi-ku, Fukuoka 819-0395, Japan

Abstract: A hybrid approach connecting Large Eddy Simulation (LES) with Reynolds-Averaged Navier-Stokes (RANS) modelling in the near-wall region is studied. The present hybrid model includes an advanced non-linear eddy-viscosity formulation to more correctly resolve the near-wall stress anisotropy. To investigate the model performance for complex turbulence, the present model is applied to a periodic hill flow with massive separation. The present model provides encouraging results for further development of this kind of hybrid LES/RANS model.

Keywords: turbulence; large eddy simulation; LES; hybrid LES/RANS model; nonlinear eddy-viscosity model; NLEVM; separation; CFD; computational fluid dynamics; Reynolds-Averaged Navier-Stokes modelling; near-wall stress anisotropy; flow fields; separation; periodic hill flow.

DOI: 10.1504/PCFD.2006.011320

Progress in Computational Fluid Dynamics, An International Journal, 2006 Vol.6 No.8, pp.475 - 486

Published online: 17 Nov 2006 *

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