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

Keywords:

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