不同底坡有流流场中单个气泡运动的三维数值模拟

为了对不同水底地形和不同来流情况下,单个气泡上升并与自由表面相互作用的运动进行三维数值模拟,采用了VOF中的PLIC界面重构方法.结果表明:有无来流及来流大小对水平底面的气泡上升运动几乎没有影响.从不同水底坡度和不同来流速度耦舍下气泡运动发现,流速和底坡的耦合能有效增大气泡上升速度和自由表面抬升高度,并增大气泡变形.底坡坡度或速度越大,气泡相应物理量增幅也越大,变形更明显.

Three -dimensional numerical simulation of single bubble movement in different topography and different inflows

To simulate a single three-dimensional gas bubble rising in liquid with a free surface and different bottom topography and inflows,the VOF/PLIC method was adopted.The results show that the bubble rise is independent of the inlet flow velocity or the static initial flow field with a horizontal bottom,that the coupling study of the different topography with different inflow velocities displays that as the most influential situation,the coupling of some large inflow with left-lower-right-higher inclined slope ...