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三维气泡与自由表面相互作用的直接数值模拟
引用本文:吴锤结,李霞.三维气泡与自由表面相互作用的直接数值模拟[J].固体力学学报,2006(Z1).
作者姓名:吴锤结  李霞
作者单位:[1]解放军理工大学理学院流体力学研究中心 [2]解放军理工大学理学院流体力学研究中心 南京
基金项目:解放军理工大学预先研究基金课题,江苏省自然科学基金重点课题(#BK2003208)资助项目
摘    要:采用VOF中的PLIC界面重构方法数值模拟了三维气泡在液流中上升并与自由表面相互作用的运动.分别考察了不同初始高度,有无来流及有无再生气泡对气泡上升高度、上升速度、压力及与自由表面相互作用等的影响.结果表明:气泡初始位置越低,顶端上升的高度越大,自由面隆起的范围更广.越靠近自由表面,底部射流横向发展越窄,而向上的压力梯度,气泡上升速度,底部射流上升高度越大,反之则反;但如果底部射流均在接近自由表面以前已横向发展充分,则差别不大.气泡外形、上升高度、破裂时间以及上升速度与来流无关.产生再生气泡后,原生气泡与再生气泡相吸,相互加速对方的上升;自由表面抬升的高度增幅较大,范围拓宽,上升速度也大大增加,且再生气泡越多,自由表面隆起的范围越大.

关 键 词:气泡动力学  自由表面  相互作用

NUMERICAL SIMULATION OF INTERACTION OF A 3D BUBBLE WITH A FREE SURFACE
Wu Chuijie Li Xia.NUMERICAL SIMULATION OF INTERACTION OF A 3D BUBBLE WITH A FREE SURFACE[J].Acta Mechnica Solida Sinica,2006(Z1).
Authors:Wu Chuijie Li Xia
Abstract:The rise and deformation of a gas bubble in a liquid and interaction with a free surface is investigated with PLIC method.The effects of the initial height of bubble and whether have incoming flow and regenerated bubbles or not are demonstrated.According to the simulation results,the lower the initial height is,the higher the bubble's top height is,and the wider the free surface raises.The more the bubble close to the free surface,the narrower the bottom jet develops crosswise,and the larger the pressure gradient,the rising velocity and the height of the bottom jet is upwards.However,if either of the bottom jet develops enough crosswise,the difference is small.Moreover,the shape of the bubble,the height and the velocity upwards and the breaking time has no correlation with incoming flow.If another bubble or more are regenerated,the initial one interacts with them and they Absorb and accelerate each other. Correspondingly,the free surface raises higher and wider,and the velocity is larger upwards,and the more the regenerated bubbles are,the wider the free surface raises.
Keywords:bubble dynamics  free surface  interaction
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