Vortical structures in a shallow wake of the flow around a confined cylinder at Re=3750.

We study the flow over a cylinder placed between two parallel rigid walls using Large-eddy simulations. The Reynolds number based on the inflow velocity and diameter of the cylinder is 3750 corresponding to the subcritical regime with laminar separation. The comparison of the timeaveraged flow patterns shows very good agreement with experiments. The unsteadiness of the recirculating bubble features the low-frequency modulation observed for the first time. [ABSTRACT FROM AUTHOR]