将分离涡模型( DES),即一种RANS和LES的混合模型,应用于带自由表面的地表水流运动,建立一套数值仿真模型。模型基于有限体积法,水平面内采用非结构计算网格,垂向为结构化网格,对流项离散格式采用二阶TVD格式,并行基于OpenMP语言库。算例表明DES模型有助于揭示复杂地形条件下带自由表面水流的大涡拟序结构。
A detachededdy simulation ( DES) model is proposed based on a fully hydrodynamic pressure model instead of hydrostatic model. The numerical scheme is based on finite volume method (FVM) on unstructured grids in the horizontal plane, andσcoordinate in vertical direction to fix free surface and uneven bottom. The inhouse codes are paralleled using OpenMP. The proposed model is shown particularly effective in prediction of smallscale vortical structures.