EFFECTS OF FINITE DIFFERENCE SCHEMES ON LES OF TURBULENT FLOW AROUND BLUFF BODY

Abstract

LES simulations have been performed using different finite difference schemes derived by a general procedure for discretising the convective terms to evaluate their importance in the results of thesimulation. Two typical subgrid-scale stress models have also been examined. The flow past a square cylinder is taken as a benchmark test case of general flow around a bluff body. The code was initially validated at different low Reynolds number and then calculation results are compared with experimental data. Dynamic Smagorinsky model is seen to improve the solution marginally. Upwind-biased scheme of appropriately high order has been found to give satisfactory results.