三维方柱不可压缩绕流的大涡模拟计算

用非定常不可压缩流动求解方法对三维方柱绕流问题作了大涡模拟计算研究.求解程序采用虚拟压缩方法和双时间步的时间推进方案,对流项的差分采用高阶精度的数值差分格式.通过与实验和文献结果比较分析,验证了基于虚拟压缩方法的湍流大涡模拟计算方案对于复杂的三维钝体绕流计算是可行的.

Large eddy simulation of 3-dimensional incompressible flow around a square cylinder

An unsteady incompressible Navier-Stokes solver is used for Large Eddy Simulation(LES) calculation of 3D flow past a square cylinder.The present solver uses a primitive variable formulation that is based on the artificial compressibility method combined with dual time stepping method.High order scheme is used for the differencing of the convective terms.The results are compared with detailed experiment data or computational results by other authors to prove the validation of using current methods to predict complex flows such as flows past bluff bodies.