Numerical investigation of collapsing cavity arrays
Numerical investigation of collapsing cavity arrays
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DOI：
10.1063/1.4719142
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发表时间：
2012-05-01
影响因子：
4.6
通讯作者：
Adams, N. A.
中科院分区：
文献类型：
--
作者：
Lauer, E.;Hu, X. Y.;Adams, N. A.
在大多数涉及空化的技术应用中，蒸汽泡出现在云中，它们的崩溃受到与相邻气泡相互作用的影响。研究这些相互作用的影响的一种方法是研究在冲击波载荷下水中空腔阵列的崩溃。我们详细描述的崩溃机制，在崩溃的水平腔阵列，特别是考虑到最大压力。作为一般的趋势，我们发现在连续的空腔崩溃的压力放大。然而，通过增加腔的数量，我们能够证明放大不是单调的。水平阵列中气泡分离距离的参数研究表明，较小的距离通常但不一定会导致较大的崩溃压力。与一般趋势不同的是由于非常复杂的激波和膨胀波相互作用，并表明使用最先进的数值方法的重要性。通过改变边界条件，我们说明了在实验研究中的大型测试部分的意义，因为在自由表面发射的膨胀波对崩溃动力学有很大的影响。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.4719142]
In most technical applications involving cavitation, vapor bubbles occur in clouds, and their collapse is affected by the interaction with neighboring bubbles. One approach to study the influence of these interactions is the investigation of the collapse of cavity arrays in water under shock wave loading. We describe in detail the collapse mechanisms during the collapse of a horizontal cavity array, with particular consideration of maximum pressures. As general trend, we find a pressure amplification in consecutive cavity collapses. However, by increasing the number of cavities, we are able to demonstrate that the amplification is not monotonic. A parameter study of the bubble separation distance in horizontal arrays shows that a smaller distance generally, but not necessarily, results in larger collapse pressure. Exceptions from the general trend are due to the very complex shock and expansion-wave interactions and demonstrate the importance of using state-of-the-art numerical methods. By varying boundary conditions, we illustrate the significance of large test sections in experimental investigations, as the expansion wave emitted at a free surface has a large effect on the collapse dynamics. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4719142]