Subgrid-scale model effect on large-eddy simulation of a fully developed turbulent duct flow

Large-eddy simulation (LES) of turbulent flow in a square duct is performed with the dynamic Smagorinsky (DS) subgrid-scale (SGS) model at Ret = 180. To investigate the effect of the SGS model on LES predictions, a simulation without an SGS model is also performed and the results are compared with those of the DS model and a reference direct numerical simulation (DNS) data. Simulations are carried out using a second-order finite volume Navier—Stokes solver. LES predictions with the DS model show a reasonable agreement with the DNS data for the mean velocity and Reynolds stresses. An appreciable improvement in LES predictions is also observed compared with the no SGS model predictions

کلیدواژه ها:

large-eddy simulation ، square duct ، turbulent flow ، dynamic Smagorinsky model