Abstract
SummaryThe influence of spatial resolution and subgrid-scale modeling on the results of large eddy simulations (LES) of a turbulent, recirculating flow is discussed. A series of simulations of the high Reynolds number turbulent flow over a backward-facing step have been performed and compared with experimental data. In these calculations the grid spacing and spanwise (homogeneous) dimension of the computational domain have been systematically varied. Two different eddy-viscosity-type, subgrid-scale (SGS) models have been employed to model the fine scale effects of turbulence in the flow. It is shown that the time-averaged flow variables are profoundly influenced by the dimensions of the computational domain in the spanwise direction. Results obtained with the two SGS models are qualitatively similar although distinct differences exist.
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