用BGK格式计算不可压缩流场  

COMPUTATION OF INCOMPRESSIBLE FLUID FLOW WITH BGK METHOD

作　　者：苏铭德[1] 徐昆[2] M.Ghidaoui 

机构地区：[1]清华大学工程力学系,北京100084 [2]香港科技大学数学系

出　　处：《力学学报》2000年第6期641-650,共10页Chinese Journal of Theoretical and Applied Mechanics

基　　金：香港科技大学研究基金(RGC97/98.HKUST6166/97P;RGC96/97.HKUST718/96E);国家自然科学

摘　　要：简要介绍ＢＧＫ方法的基本思想，数值方法及其对不可压缩流场数值计算的推广．然后详细介绍将ＢＧＫ方法应用于平面方框流的结果，将其结果与Ｇｈｉａ的结果进行了详细的比较．本方法还用来模拟后台阶流动，所得结果与相应的实验数据进行比较．以上比较表明本方法的有效性，同时也确定在计算不可压缩流体时参数的正确选择．In the present paper, the basic idea of BGK method is introduced in detail and extended in the numerical simulation of incompressible fluid flow. First, the BGK method is used in cavity flow, where the numerical results are compared with Ghia's results. In the computation, the parameters, such as Mach number, inner freedom degree K, and the boundary conditions are selected. The comparison shows that the present numerical results agree to the Ghia's results, which have higher accuracy. At the same time, this method is applied for simulation of backward facing step flow. The results are compared with experimental data. The comparisons show that the BGK method is a powerful tool in the numerical simulation of incompressible fluid flow. The numerical experience shows that this method is easily parallelized, it is available to be used in unstructured grid system and multi-dimensional problem. Therefore it is hopeful method in CFD.

关 键 词：BGK法 不可压缩流动 数值模拟 

分 类 号：O357.1[理学—流体力学]