虚拟流体方法中界面处Riemann问题定义方式的改进  

Improvements on Definition of Interficial Riemann Problem in Real Ghost Fluid Method

作　　者：丁岩[1] 袁礼[1] 

机构地区：[1]中国科学院数学与系统科学研究院计算数学所,北京100190

出　　处：《计算物理》2010年第4期501-508,共8页Chinese Journal of Computational Physics

基　　金：国家重点基础研究计划(2005CB321703);国家自然科学基金(10531080;10729101)资助项目

摘　　要：对RGFM中定义Riemann问题的方式进行改进,取距离界面适当远处的插值点处的状态作为Riemann问题的初值.并用数值算例对改进前后的RGFM进行比较.In conventional ghost fluid method,Riemann problems are defined by taking direatly states at grid points as initial conditions.In this article,we improve this approach by taking states at interpolated points as initial conditions.States at interpolated points are obtained by area average of states at four surrounding grid points.Since initial conditions are smooth,our method gives results with less numerical oscillations.Numerical experiments illustrate that the method is effective.

关 键 词：可压缩多介质流动 虚拟流体方法 RIEMANN问题 

分 类 号：O351[理学—流体力学]