摘要
采用FTM研究了两相流体界面中的K-H不稳定性,分析了初始振幅、波数、表面张力、密度比、速度梯度、韦伯数We对K-H不稳定性发展的影响。结果表明:增大初始扰动对K-H不稳定性具有促进作用,扰动越强,K-H波浪翻卷高度越高;波数的增加能加快K-H不稳定性的衍化过程,但对K-H波浪高度的发展影响较小;减小表面张力或密度比都能使不稳定性的发展速度增加;初始速度梯度对不稳定性的发展有较大影响,梯度越大,K-H波浪翻卷高度越高;We对K-H波浪的对称性影响较大,We越小,对称程度越高。
K-H(Kelvin-Helmholtz) instability that caused by shear stresses is simulated by Fortran for two fluids by using Front Tracking Method. Effects of initial wave amplitude, wave number, surface tension, density ratio, velocity gradient and Weber number forcing on Kelvin-Helmholtz instability are investigated. Numerical simulation results show that increase initial wave amplitude will increase the growth of Kelvin-Helmholtz instability, and billow height reaches more value. Wave number has little influence on the growth of billow height, but speeding up the K-H instability development. It is also shown that increase the surface tension or the density ratio reduces the growth of the K-H instability. It is observed that as the velocity difference gets larger, the interface rolls up. In the end, the results show that large Weber number will reduce wave symmetry.
出处
《应用力学学报》
CSCD
北大核心
2017年第6期1061-1066,共6页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(11562011)
江西省自然科学基金(20151BAB202002)
