摘要
利用五阶迎风紧致差分格式加群速度控制方法对激波与轻气体柱形界面的干扰问题进行直接数值模拟 ,并研究了涡量的产生及其发展和界面的变形 ,分析了柱形界面的失稳过程 ,得知在线性发展阶段 ,重气体以恒定的速度进入到轻气体中 ,并形成尖钉结构 ;在非线性发展阶段 ,在尖钉头部的两侧形成一对旋转方向相反的涡结构 .同时证实了激波与界面的相互干扰有助于增加混合 .并将所得的数值解与实验结果进行了比较 .
An approach combining the fifth Upwind Compact Difference Scheme and Group Velocity Control is applied to simulate directly the interaction of shocks and the density stratified interface of light-gas cylinder.Some research about the generation and development of vorticity and the distortion of edge of cylinder is done.The instability of cylinder density-interface is analyzed.Main character of the linear developing phase is that the gas of higher density goes into the one of lower denstiy at a constant velocity and the spike structure is formed and the character of the nonlinear developing phase is that a pair of vortex structures rotating adversely are formed on both sides of the top of the spike.The numerical solution accords with the experiment. [
出处
《计算物理》
CSCD
北大核心
2001年第5期390-396,共7页
Chinese Journal of Computational Physics
