变表面粗糙度下波在固-流界面上传播的动态空化起始
Dynamic Cavitation Inception by Wave Propagation Across Solid-Fluid Interface with Varying Solid Surface Wettability
摘要：
流固耦合（FSI）问题是一个重要的问题，因为它可能会导致严重的破坏结构。在一些流固耦合问题中，相互作用机制强烈依赖于穿过固-流界面的波的传播。在这项研究中，我们试图定量评估的固体表面润湿性的影响，波传播的固体-流体界面与流固耦合的情况下，纵波传播垂直向界面。在实验过程中，当水被固体缓冲器运动持续压缩时，由于透射拉伸波在缓冲器-水界面上的循环传播，出现了空化气泡。结果表明，界面润湿性边界条件可以改变波的传输行为，由于空化发生的变化。还证实润湿性越差，空化强度越大，缓冲器损失的能量与储存在水中的能量之间的差异越大。因此，空化初生对具有流固耦合的固-流界面处的波传播的影响可以通过考虑从固体到水的能量传递来定量评估。
英文摘要：
Fluid-structure interaction (FSI) problems are important because they may induce serious damage to structures. In some FSI problems, the interaction mechanism is strongly dependent on the wave propagation across the solid-fluid interface. In this study, we attempted a quantitative evaluation of the effect of the solid surface wettability on the wave propagation across the solid-fluid interface with FSI in the case of longitudinal wave propagation vertically towards the interface. During the experiments, while the water was continuously compressed by the solid buffer motion, cavitation bubbles appeared being originated from the buffer-water interface as a result of the transmitted tensile wave propagating across the interface in a cycle. It was confirmed that interfacial boundary condition as wettability could change the wave transmission behavior owing to changes in the cavitation occurrence. It was also confirmed that the worse the wettability, the severer the cavitation intensity, and the greater the difference between the energy lost by the buffer and the energy stored in the water. Consequently, the effect of the cavitation inception on the wave propagation at the solid-fluid interface with FSI could be quantitatively evaluated by considering the energy transferred from the solid to the water.
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