LES of Flow around a Circular Cylinder at a Subcritical Reynolds Number with Cartesian Grids

Large eddy simulations (LES) of turbulent flow around a circular cylinder are performed with a novel technique using Cartesian grids. Several test cases investigate the influence of the subgrid-scale model (Smagorinsky vs. dynamic Germano) and the grid resolution. The results show overall fair agreement between LES and a recently performed DNS. An important issue turns out to be the proper prediction of the mean recirculation length. Results are also compared with experimental data for the near and far wake regions. The shape of the mean streamwise velocity profile inside the recirculation bubble remains an open question.

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