Non-spherical bubble dynamics of underwater explosions in a compressible fluid
Non-spherical bubble dynamics of underwater explosions in a compressible fluid
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DOI：
10.1063/1.4812659
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发表时间：
2013-07
影响因子：
4.6
通讯作者：
Q. Wang
中科院分区：
文献类型：
--
作者：
Q. Wang
本文研究了马赫数为O(10−1)的可压缩液体流中水下爆炸的气泡动力学。我们将在弱可压缩理论的基础上，利用匹配渐近展开的方法研究这一现象。结果表明，气泡附近的二阶内部流动可用拉普拉斯方程描述，只有在远场条件下才会出现可压缩效应。因此，该问题可以用边界积分法近似模拟。根据球形气泡的Keller方程和浮力作用下非球形气泡“小装药”爆炸的现有实验数据进行了验证。计算跟踪了喷射碰撞、气泡从单连通到双连通的转变、双连通到单连通的重组以及进一步的重复转变。气泡形状的计算结果与实验结果相吻合。
This paper is concerned with the bubble dynamics of underwater explosion in a compressible liquid flow whose Mach number, based on characteristic liquid velocities, is O(10−1). We will study this phenomenon based on weakly compressible theory using the method of matched asymptotic expansions. As a result, the inner flow near the bubble to second order is described by Laplace's equation with the compressible effects appearing only in the far field condition. The problem can thus be modelled approximately using the boundary integral method. Validations are performed against the Keller equation for spherical bubbles and available experimental data for “small-charge” explosions for non-spherical bubbles under the action of buoyancy. The computation traces jet impact, the transition of the bubble from a singly connected to a doubly connected form, and the recombining of a doubly connected to a singly connected form, and the further repeated transitions. The computational result of the bubble shapes correlates ...