Journal
JOURNAL OF COMPUTATIONAL PHYSICS
Volume 227, Issue 21, Pages 9271-9291Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcp.2008.04.015
Keywords
LES; Numerical methods; Turbulence modeling; Wall functions; Law of the wall; Boundary conditions
Funding
- AFOSR [FA9550-04-1-0020, FA9550-04-1-0389]
- DOE [B341492, W-7405-ENG-48]
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We describe a large-eddy simulation 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 expansions, 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 solution 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. We present simulation results for turbulent channel flow up to Reynolds number based oil the wall-friction velocity of 10(6). These compare favorably with results from large-scale DNS and experimental correlations. (C) 2008 Elsevier Inc. All rights reserved.
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