LES approach for high Reynolds number wall-bounded flows with application to turbulent channel flow
The authors describe a large eddy simulation (LES) approach for turbulent channel flow using the stretched-vortex subgrid-scale model. The inner region of the turbulent boundary layer is not included in the modeling of this attached, wall-bounded flow. Appropriate boundary conditions and closure are derived using a combination of elements from asymptotic expansion, matching, and well-established wall-modeling approaches. The modeling approach for this application combines the stretched-vortex subgrid model with a localized wall-shear-stress treatment that relates the instantaneous wall-parallel velocity to the shear stress via the log-law, as appropriate for this (near-) zero pressure gradient flow. The impermeability boundary condition is built into the method, such that only the outer flow is simulated, obviating the need to impose the stiff no-slip condition at the wall. This formulation attempts to minimize numerical and modeling errors introduced by the boundary-condition treatment, while preserving the fundamental elements required to predict low-order statistics of these flows. Some simulation results are presented for turbulent channel flows up to the Reynolds number based on the wall- friction velocity. These compare favorably with results from large-scale DNS and experimental correlations.
scientific article; zbMATH DE number 5355900
scientific article