基于CLSVOF方法的三维单个上升气泡运动的数值模拟

运用CLSVOF方法数值模拟了三维单气泡在液体中的上升和变形过程,分别考察了液体的表面张力和浮力对上升气泡变形的影响。计算结果表明:CLSVOF方法能比较精确地跟踪三维单气泡在液体中的上升过程;在相同密度比和粘度比情况下,随着液体表面张力的减小和液体浮力的增大,气泡底部形成的射流使得气泡下缘凹陷变得明显,变形幅度加大,射流穿透气泡的时间提前。

Numerical simulation of a three-dimensional rising gas bubble based on CLSVOF method

The rising and deformation of a three-dimensional gas bubble in the static liquid were simulated by use of the CLSVOF method.The numerical results show that the method is able to simulate the deformation and breakup of a rising bubble.The study of effects of surface tension and buoyancy on the deformation of the bubble during its rise process shows that,under the same density and viscosity ratio,in the case of the surface tension is reduced or the buoyancy is increased,the depression at the lower edge of the bubble becomes more apparent,that the bubble deformation is increasing,as well as,the jet penetrating the upper surface is earlier.