Abstract
In order to derive a possible path for developing a large eddy simulation (LES) applicable to high Reynolds-number turbulent flows, a hybrid approach connecting 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. To investigate the model performance in detail, the proposed model is applied to fully-developed plane channel flows with various grid resolutions and at various Reynolds numbers. The grid resolution in the streamwise ( x) and spanwise ( z) directions ranges from 10 1 to 10 3 in wall unit (Δ x + or Δ z +), while y wall + ∼ 1 in the wall-normal ( y) direction. The present model provides encouraging results for further development of this kind of hybrid LES/RANS model.
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