Smagorinsky SGSモデルにおける標準型とDynamic型の比較 : Dynamic LESによる2次元角柱まわりの乱流渦放出流れの解析(第1報)

抄録

A turbulent vortex-shedding flow past a two-dimensional (2D) square cylinder at Re=2.2×10^4 was simulated by Large Eddy Simulation (LES) using the dynamic Subgrid-scale (SGS) model. Here, the dynamic SGS model was incorporated into the second-order finite volume method. Results from the dynamic SGS model were compared with those from the standard Smagorinsky SGS model and the experiments conducted by Lyn. The dynamic SGS model improved the accuracy of the predictions remarkably. The mean velocity distribution given by the dynamic SGS model showed very close agreement with the experiment in the wake region, while the standard Smagorinsky model somewhat underestimated the size of the reverse flow region behind the cylinder.