Approximate Wall Boundary Conditions in the Large-Eddy Simulation of High Reynolds Number Flow |
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Authors: | W Cabot P Moin |
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Institution: | (1) Center for Turbulence Research, Stanford University, Bldg. 500, 488 Escondido Mall, Stanford, CA, 94305-3030, U.S.A. |
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Abstract: | The near-wall regions of high Reynolds numbers turbulent flows must be modelled to treat many practical engineering and aeronautical
applications. In this review we examine results from simulations of both attached and separated flows on coarse grids in which
the near-wall regions are not resolved and are instead represented by approximate wall boundary conditions. The simulations
use the dynamic Smagorinsky subgrid-scale model and a second-order finite-difference method. Typical results are found to
be mixed, with acceptable results found in many cases in the core of the flow far from the walls, provided there is adequate
numerical resolution, but with poorer results generally found near the wall. Deficiencies in this approach are caused in part
by both inaccuracies in subgrid-scale modelling and numerical errors in the low-order finite-difference method on coarse near-wall
grids, which should be taken into account when constructing models and performing large-eddy simulation on coarse grids. A
promising new method for developing wall models from optimal control theory is also discussed.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | turbulence large-eddy simulation wall models channel flow separation |
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