TRANSIENT CAVITIES NEAR BOUNDARIES .1. RIGID BOUNDARY
TRANSIENT CAVITIES NEAR BOUNDARIES .1. RIGID BOUNDARY
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DOI：
10.1017/s0022112086000988
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发表时间：
1986-09-01
影响因子：
3.7
通讯作者：
DOHERTY, G
中科院分区：
文献类型：
--
作者：
BLAKE, JR;TAIB, BB;DOHERTY, G
通过边界积分法模拟了在浮力和入射驻点流存在下刚性边界附近瞬态汽泡的增长和崩溃。气泡形状，颗粒轨迹线和压力等值线被用来说明数值解的结果。根据物理参数的相对大小，塌陷气泡的迁移以及随后的射流形成可以朝向或远离刚性边界。对于适当的参数范围内的驻点流，不寻常的“沙漏”形状的气泡形成的泡沫崩溃的结束。它被假定为气泡的最终崩溃状态可能是两个环形气泡/环涡的相反的循环。对于有浮力的蒸汽空腔，开尔文脉冲用于获得确定在塌陷气泡中的迁移方向和随后的射流形成的标准。
The growth and collapse of transient vapour cavities near a rigid boundary in the presence of buoyancy forces and an incident stagnation-point flow are modelled via a boundary-integral method. Bubble shapes, particle pathlines and pressure contours are used to illustrate the results of the numerical solutions. Migration of the collapsing bubble, and subsequent jet formation, may be directed either towards or away from the rigid boundary, depending on the relative magnitude of the physical parameters. For appropriate parameter ranges in stagnation-point flow, unusual ‘hour-glass’ shaped bubbles are formed towards the end of the collapse of the bubble. It is postulated that the final collapsed state of the bubble may be two toroidal bubbles/ring vortices of opposite circulation. For buoyant vapour cavities the Kelvin impulse is used to obtain criteria which determine the direction of migration and subsequent jet formation in the collapsing bubble.