Comparative Assessment of LES and URANS for Flow Over a Cylinder at Reynolds

Numerical simulations utilising turbulence models based on the Reynolds Averaged Navier Stokes (RANS) equations generally exhibit poor performance in predicting separated flow around cylinders. This paper assesses potential improvements offered by the three-dimensional unsteady RANS and Large Eddy Sim-ulation (LES) methodologies in replicating the flow around a cylinder at a Reynolds number, based on diameter, of 3900. The performance is assessed against corresponding experimen-tal data and two-dimensional unsteady RANS turbulence simu-lations