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阐述了建立在一方程湍流模型基础上的分离涡模型(DES)和延迟脱体涡模型(DDES),它们很好地模拟了壁面附近的小尺度流动。该方法在大攻角分离流区域,使用了亚格子应力的Smagorinsky大涡数值模拟,模拟亚音速旋涡流动。使用大攻角下的钝前缘65°大后掠三角翼模型,研究了CFD对涡的发展、破裂以及复杂涡的发展和演变的模拟能力。研究结果说明了方法对模拟分离流动是可行的。
The separation vortex model (DES) and delamination extinction vortex model (DDES) based on an equation turbulence model are described, which well simulate the small-scale flow near the wall. The method uses Smagorinsky large-eddy numerical simulation of sub-lattice stress to simulate the subsonic vortex flow in the area of high-angle separation flow. Using the blunt trailing-edge 65 ° large-swept delta wing model at large attack angle, the capability of CFD to simulate the development and rupture of vortices and the development and evolution of complex vortices was studied. The results show that the method is feasible to simulate the flow of separation.