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AN INVESTIGATION OF HYBRID LES/RANS MODELS FOR PREDICTING FLOW FIELDS WITH SEPARATION

Ken-ichi Abe
Department of Aeronautics and Astronautics, Kyushu University, Motooka, Nishi-ku, Fukuoka 819-0395

Yoshihiro Miyata
Department of Aeronautics and Astronautics, Kyushu University Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan

Abstract

A hybrid approach connecting large eddy simulation (LES) with the Reynolds-averaged Navier-Stokes (RANS) modeling in the near-wall region is studied. In contrast to most of the previous studies that have employed linear eddy-viscosity models, in this study, an advanced non-linear eddy-viscosity model is introduced to resolve the near-wall stress anisotropy more correctly. The proposed model is applied to a periodic hill flow with massive separation, as well as fundamental fully-developed plane channel flows. In the calculations, various grid resolutions are used to investigate the model performance in detail. The present model provides encouraging results for further development of this kind of hybrid LES/RANS model.