Numerical Simulation of Bubble Dynamics in Microgravity

被引：4
作者：
Lin Pu
Huixiong Li
Xiao Lv
Jianfu Zhao
Tingkuan Chen
Yuqin Zhu
机构：
[1] Xi’an Jiaotong University,State Key Laboratory of Multiphase Flow in Power Engineering, Department of Thermal Engineering, School of Energy and Power Engineering
来源：
Microgravity Science and Technology | 2008年 / 20卷
关键词：
Level set method; Moving mesh method; Collocated grid; Microgravity;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
A numerical method for the simulation of two-phase flows under microgravity conditions is presented in this paper. The level set method is combined with the moving mesh method in a collocated grid to capture the moving interfaces of the two-phase flow, and a SIMPLER-based method is employed to numerically solve the complete incompressible Navier-Stokes equations, and the surface tension force is modeled by a continuum surface force approximation. Based on the numerical results, the coalescence process of two bubbles under microgravity conditions (10 − 2×g) is compared to that under normal gravity, and the effect of gravities on the bubbles coalescence dynamics is analyzed. It is showed that the velocity fields inside and around the bubbles under different gravity conditions are quite similar, but the strength of vortices behind the bubbles in the normal gravity is much stronger than that under microgravity conditions. It is also found that under microgravity conditions, the time for two bubbles coalescence is much longer, and the deformation of bubbles is much less, than that under the normal gravity.
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页码：247 / 251
页数：4
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