Numerical investigation on the collapse of a bubble cluster near a solid wall
Numerical investigation on the collapse of a bubble cluster near a solid wall
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固体壁附近气泡团破裂的数值研究
DOI：
10.1103/physreve.99.043108
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发表时间：
2019
影响因子：
2.4
通讯作者：
Jian Deng
中科院分区：
文献类型：
--
作者：
Lingxin Zhang;Jing Zhang;Jian Deng
本文用数值方法研究了近壁空泡团（作为空泡云的原始模型）的溃灭。采用均相两相混合物模型，汽液界面采用流体体积法求解。液体被视为可压缩的，允许由状态方程确定的速度的压力波的传播。该簇由27个相同的气泡组成，均匀分布在一个立方体区域中，考虑了各种气泡壁和气泡之间的距离。我们的模拟表明，泡壁距离起着更重要的作用。最大的冲击压力是在团簇离壁面很近时达到的.通过研究气泡形状和流场的演变，观察到向内的进展的崩溃，与两个明显不同的序列之间的小和大的气泡壁距离的崩溃。当气泡间距较大时，最中心的气泡最后破裂，而当气泡间距较小时，最靠近壁面的中心气泡最后破裂。这种差异也可以解释更强烈的脉冲压力为较小的气泡壁距离。所提出的数值方法是特别感兴趣的，因为它可以解决气泡和气泡壁相互作用的细节，这是显着的空化云的崩溃的研究，其潜在的损害液压系统。
This paper studies numerically the collapse of a cluster of cavitation bubbles (as a primitive model for a bubble cloud) near a solid wall. The homogeneous two-phase mixture model is used, with the liquid-vapor interface resolved by volume of fluid method. The liquid is treated as compressible, allowing the propagation of pressure waves at the speeds determined by a state equation. This cluster consists of 27 identical bubbles, evenly distributed in a cubic region, with various bubble-wall and bubble-bubble distances considered. Our simulations suggest that the bubble-wall distance plays a more significant role. The maximum impulsive pressure ofis achieved when the cluster is very close to the wall. The inward progress of collapse is observed by examining the evolutions of bubble shapes and flow fields, with two distinctly different sequences of collapse identified between the small and large bubble-wall distances. At a large bubble distance, the centermost bubble is the last to collapse, while at a small bubble distance, it is the central bubble nearest to the wall which collapses lastly. This difference can also explain the more intensive impulsive pressure for the smaller bubble-wall distances. The proposed numerical approach is of special interest because it can resolve the details of bubble-bubble and bubble-wall interactions, which are significant to the study of the collapse of a cavitation cloud, and its potential damage to hydraulic systems.