三维流体界面不稳定性的Ghost方法

THE GHOST METHOD FOR FLUID INTERFACE INSTABILITY IN 3D

Euler方法对大多数气体流动处理得很好 ,但在临近材料界面的区域出现非物理振荡 .Lagarange方法对多材料界面适用性很好 ,但它在处理大变形和大多数气体流动的涡结构却有自身的困难 .理想的稳定性强的方法是结合两种方法的长处 .利用LevelSet方法来确定界面位置 ,利用Ghost方法来确定临近界面的网格点的状态量 .采用单侧界面的熵插值技巧来捕捉适宜的界面边界条件 。

It uses a Level Set function to track the motion of a fluid interface in an Eulerian framework.In addition,the use of Ghost cells (actually Ghost nodes in the difference framework) can keep the density profile from smearing out,while still preserving the scheme robust and easy to program with 2 nd accuracy TVD scheme in spacial and two step Runge Kutta methods.In contrast, the references[6][7] allow the density profile smearing out.This method significantly improves the resolution at the contact discontinuity. [