时刻追踪多介质界面运动的动网格方法

在对可压缩多介质流动的数值模拟中,定义介质界面为一种内部边界,由网格的边组成,界面边两侧对应两种不同介质中的网格。通过求解Riemann问题追踪介质界面上网格节点的运动,同时采用局部重构的动网格技术处理介质界面的大变形问题,并将介质界面定义为网格变形边界,以防止该边界上网格体积为负。运用HLLC格式求解ALE方程组得到整个多介质流场的数值解。最后从几个多介质流模型的计算结果可以看出,本文的动网格方法是可行的,而且可以时刻追踪介质界面的运动状态。

Moving grid method in numerical simulation of compressible multi-material flows

In the numerical simulation of compressible multi-material flows,the material interface is defined as a special internal boundary composed by unstructured grid edges,either side of which corresponds to a grid of one material.Riemann problem is solved in order to track the motion of the grid points on the material interface and local re-meshing technology is applied to deal with the large-scale deformation of the moving grids.At the same time,the material interface is defined as a kind of grid-deforming boun...