运动激波对氦气泡变形过程影响的仿真研究

Simulation on Process of Moving Shockwaves Effecting Interface Changing of a Helium Bubble

使用水平集方法(Level Set Method)研究超声速气流中氦气泡的变形问题。通过比较全局重构和局部重构两种方法重新初始化符号距离函数(SDF)的效果,发现局部重构更省时,所得结果与实验结果更吻合,而全局重构存在控制误差的优化问题。在此基础上分析了激波强度和角度对气泡变形过程的影响,发现激波强度越大,气泡在相同的位移条件下变形得越明显,并且在相同激波强度下,斜激波对气泡界面变形的作用效果更为明显。

This paper uses Level Set method to study the problem of the interface changing of a helium bubble in a supersonic flow field.By comparing the effect of global reconstruction method and local reconstruction method in reinitializing the Sign Distance Function（SDF）,we find local reconstruction method costs less computing time,and can get more satisfied results agreeing with those of experiments,while global reconstruction must deal with the problem of the optimization of control error.Basing on previous work,factors of the intensity and the angle of shockwaves are analyzed for the effect on the interface changing of a bubble,and it is found that the interface changes more obviously with the increase of the intensity of shockwaves.Moreover,under similar intensity of shockwaves,the effect of an oblique shockwave on the interface changing of a bubble is better than that of a normal shockwave.