Large-eddy simulation with accurate implicit subgrid-scale diffusion
A method for large-eddy simulation is presented that does not use an explicit subgrid-scale diffusion term. Subgrid-scale effects are modelled implicitly through an appropriate monotone (in the sense of Spekreijse 1987) discretization method for the advective terms. Special attention is given to the accuracy of the implicit subgrid-scale diffusion term. Computational results are shown for the dispersion of a passive scalar in an artificial turbulent velocity field. Comparisons are made with standard large-eddy simulation results. From the viewpoint of accuracy and computational costs the results are satisfactory.