Large Eddy Simulation of Turbulent Flow past 2D Square Cylinder using Dynamic SGS Model

摘要

A turbulent vortex-shedding flow past a two-dimensional(2D) square cylinder at RE=2.2x10^4 is analyzed by Large Eddy Simulation(LES) using the dynamic Subgrid-scale(SGS)model. Here, the dynamic SGS model is incorporated into the second-order finite volume method. Results from the dynamic SGS model are compared with those from the standard Smagorinsky model and the experiments conducted by Lyn(1989). The dynamic SGS model improves the accuracy of the predictions remarkably. The mean velocity distribution given by the dynamic SGS model shows very close agreement with the experiment in the wake region, while the standard Smagorinsky model somewhat underestimates the size of the reverse flow region behind the cylinder.