LES: vortex shedding past a 2D and 3D circular cylinder

Rocchi Daniele

I'd like to exchange experiencies and informations with other researchers dealing with this topic. In particoular I'm using the LES model of Fluent 5.0 that gives some satisfactory results but with some critical points (simulations at Re=2e+4):

1) The Strouhal number, in both cases (2D-3D), is a little bit too high : 0.26 instead of 0.2 and the value seems to be unsensitive to any change in the main parameters (grid size,domain size,Cs parameter of the Smagorinsky model,time-step) other ideas and experiencies are wellcome

I'm interested in comparing our results with other similar cases: as an example we found optimum values for Cs parameter equal to 0.15 in 2D simulations and 0.1 in 3D simulations of the same circular section. Any other experiences for different sections? (Drag and Lift coefficients used as reference test parameters).