利用Ghost Fluid方法模拟激波与柱形界面相互作用  

Simulation of Interaction of Shocks with a Cylinder Interface by Means of Ghost Fluid Method

作　　者：程军波[1] 唐维军[1] 李德元[1] 傅德薰[2] 

机构地区：[1]北京应用物理与计算数学研究所计算物理实验室,北京100088 [2]中国科学院力学研究所,北京100080

出　　处：《计算物理》2003年第3期219-225,共7页Chinese Journal of Computational Physics

基　　金：国家自然科学基金重大项目(19932010);国家自然科学基金重点项目(10135010);国家自然科学基金(10072028);惯性约束聚变青年科学基金(青2002 02);计算物理实验室试点基金资助项目

摘　　要：　利用GhostFluid方法(后面简称Ghost方法)和γ model方法,在同样的时空离散精度条件下,对激波与柱形界面相互作用的二维可压缩流场进行了直接模拟,并与实验结果相比较.从模拟结果看,在短时间内,Ghost方法和γ model方法模拟的结果与实验结果基本相同,两种方法均正确地模拟出界面的位置、激波的强度和速度.但随着时间的发展,具有较大数值耗散的γ model方法的计算结果与实验差别越来越大;而数值耗散较小的Ghost方法能较为正确地模拟界面的运动.Two\|dimensional compressible flow field for the interaction of shocks with cylinder interface is directly simulated by using Ghost Fluid method (Ghost) and γ\|model method, respectively, with the same discrete order in space and time. Numerical results are compared with the experimental results. They are almost alike in the beginning time and show the right position of interface, right strength and velocity of shocks. With the time developing, the effect of large numerical dissipation of γ\|model method becomes greater and greater while the low numerical dissipation of Ghost method makes it efficient to simulate the moving interface well. Comparison with experiments proves that Ghost method is better than γ\|model method in simulating the problem of interface instability.

关 键 词：“Ghost Fluid”方法 激波 柱形界面 相互作用 二维可压缩流场 数值模拟 γ-model方法 R-M失稳 

分 类 号：O357.42[理学—流体力学]