水下气泡运动的数值模拟

In order to research the motion and evolution of a single bubble and two horizontally arranged bubbles in quiescent viscous liquid due to buoyancy, the VOF (volume of fluid) method was applied to track the interface, in which surface tension was taken into consideration. The two phase flow fields at different times coupled with principles of its wake velocity were studied. Afterwards, simulation results were made comparisons with the images taken in an experiment previously. It was indicated that the bottom of the bubble kept dimpling inwards, finally burst and diffused in water. Vortexes were clearly seen in the wake region. The two bubbles rose in a wobbly path, and didn't coalesce in the end. Results showed the good agreement between experiments and simulations. Thus, it offers a feasible simulation method for the advanced study of the two phase flow motion under water.