Abstract
In this paper we applied new methodology, which can reduce the influence of numerical viscosity due to the higher-order upwind scheme in large eddy simulation (LES), to the flow around a square cylinder. Here we focus on two parameters, the filter width of LES and the coefficient of numerical diffusion terms of the third order upwind scheme, and their effects on computed turbulent flows and aerodynamics were studied in comparison with experimental data. It is shown that two appropriate parameters can improve computational results such as the reducing of overestimated drag coefficient. The accuracy of simulating the development of the shear layer of the sides has strong correlation with the improvment of the drag coefficient.
