PARTIALLY-AVERAGED NAVIER-STOKES SIMULATION OF THE FLOW AROUND CIRCULAR CYLINDER AT Re=3900: COMPARISON OF LOW AND HIGH REYNOLDS NUMBER APPROACHES

An appropriate choice of physical resolution for the Scale-Resolved Simulations (SRS) method is crucial for the accurate prediction of flow dynamics. The present study deals with numerical simulations of the ow past a circular cylinder using the Partially-Averaged Navier-Stokes bridging method. A subcritical Reynolds number 3900 is investigated at various physical resolution (the ratio of unresolved to total resolved turbulent kinetic energy f(k)) involving two approaches to estimate the ratio of unresolved to total resolved eddy dissipation rate f(epsilon), in particular a low Reynolds number f(epsilon) = f(k) and a high Reynolds number f(epsilon) = 1 approaches. Good agreement with experimental and DNS results was achieved for a higher physical resolution f(k) <= 0:5, f(epsilon) = 1. The low Re approach led to the earlier transition of the separated boundary layer which resulted in a short recirculation region. Additionally, predicted results from simulations with the low Re approach were not in fluenced by a re nement of the computational grid.