Large Eddy Simulation of Flow around Circular Cylinders on Structured and Unstructured Grids, II

The paper presents LES computations of subcritical flow around circular cylinders. Uniform upstream conditions have been investigated with Re = 3900 and Re = 140000. The first case is considered for comparison between results obtained by the authors from earlier structured and unstructured computations and new results from a recently developed unstructured French code. Spanwise shear modifies the flow in substantial points and has been considered at Re = 6250. Time signals have been recorded and analyzed by means of Fourier and wavelet techniques. These reveal important differences between the flow with and without shear. Furthermore, work on the LES methodology is reported. We present a model for the laminar boundary layer employing an integral method and discuss the impact of streamwise variations of the grid on the computed resolved flow.