LES of the flow around a circular cylinder of finite height

The paper presents large eddy simulations of the flow around a surface-mounted circular cylinder of height 2.5 times the diameter at a Reynolds number of Re=43 000. In the first part, the different modelling parameters are discussed with respect to their influence on the computed results. One of the findings is that, on the relatively coarse grid employed, the dynamic model is deficient and yields a too short recirculation region. The results obtained with the Smagorinsky model are in fairly good agreement with measurements. In the second part of the paper a detailed analysis of the results in physical terms is provided and related to findings in the literature. In particular, the existence of tip vortices and an arch vortex in the average flow downstream of the free end is demonstrated.