Effect of the numerical dissipation and resolution on large-eddy simulation of turbulent square duct flow

In this research, large-eddy simulation of a turbulent square duct flow is performed at the friction Reynolds number , using the dynamic Samgorinsky (DS) subgrid-scale model and the results are discussed. To assess the accuracy of the DS model, the results are compared with the reference direct numerical simulation data. Moreover, to see the effect of the DS model, a numerical simulation without a subgrid-scale model is also performed and the results are compared with those of the DS model. Simulations are carried out using a second-order finite volume method for discretization of the Navier—Stokes equations. Results from the DS model simulations, for the grid used, are in good agreement with the direct numerical simulation data for the mean velocity and Reynolds stresses and an appreciable improvement is observed with respect to the no subgrid-scale model simulations.