Abstract
Several issues involving the large-eddy simulation (LES) of wall bounded compressible turbulent flows are investigated. A spatially evolving supersonic boundary layer is simulated using a high-orderaccurate finite difference scheme and the dynamic subgrid-scale model. A parametric study suggests that the finite difference scheme has a detrimental effect on the resolution of the smaller scales due to excessive numerical dissipation from the spatial differencing. Also, since the dynamic model uses the smaller resolved-scale eddies to determine the model coefficients, the predicted coefficients do not have the appropriate values. The use of higher-order schemes is found to better capture the smaller resolved scales and substantially improve the quality of the results. The effect of discretization errors on LES needs to be addressed further before proceeding with LES of flows of engineering interest.
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