Dynamics of Wave Propagation across Solid-fluid Movable Interface in Fluid-Structure Interaction
Dynamics of Wave Propagation across Solid-fluid Movable Interface in Fluid-Structure Interaction
复制标题
DOI：
10.1115/1.4035376
复制
发表时间：
2017-06
影响因子：
1
通讯作者：
Tomohisa Kojima;K. Inaba;Kosuke Takahashi;F. Triawan;K. Kishimoto
中科院分区：
文献类型：
--
作者：
Tomohisa Kojima;K. Inaba;Kosuke Takahashi;F. Triawan;K. Kishimoto
通过实验研究，建立了考虑流固耦合作用的波在固液界面上传播的理论模型。尽管人们对固-固和流-流界面进行了大量的研究，但对波在固-流界面上的传播机理还没有很好的研究。因此，我们的目标是澄清的机制，波传播通过固体-流体界面的界面的运动，并建立一个理论模型来解释这一现象。在所进行的实验中，使用自由下落的钢射弹来撞击放置在聚碳酸酯（PC）管内的水表面正上方的固体缓冲器。两种不同的缓冲层（铝和聚碳酸酯）被用来检查波传播之间的关系，通过缓冲层和水的界面和界面运动。实验结果表明，基于弹性体和缓冲体在波传播过程中局部变形的假设，可以通过声学理论预测界面压力的峰值。另一方面，它揭示了界面压力的平均轮廓可以预测与弹丸和缓冲器之间的动量守恒假设是刚性的和流体的动量增加。随着波的传播，传递到流体的动量逐渐增加，并导致界面压力逐渐减小。通过考虑流体和管的耦合，通过填充流体的管中的波速来估计动量的量。
A theoretical model for wave propagation across solid–fluid interfaces with fluid–structure interaction (FSI) was explored by conducting experiments. Although many studies have been conducted on solid–solid and fluid–fluid interfaces, the mechanism of wave propagation across solid–fluid interfaces has not been well examined. Consequently, our aim is to clarify the mechanism of wave propagation across a solid–fluid interface with the movement of the interface and develop a theoretical model to explain this phenomenon. In the experiments conducted, a free-falling steel projectile was used to impact a solid buffer placed immediately above the surface of water within a polycarbonate (PC) tube. Two different buffers (aluminum and polycarbonate) were used to examine the relation between wave propagation across the interface of the buffer and water and the interface movement. With the experimental results, we confirmed that the peak value of the interface pressure can be predicted via acoustic theory based on the assumption that projectile and buffer behave as an elastic body with local deformation by wave propagation. On the other hand, it was revealed that the average profile of the interface pressure can be predicted with the momentum conservation between the projectile and the buffer assumed to be rigid and momentum increase of fluid. The momentum transmitted to the fluid gradually increases as the wave propagates and causes a gradual decrease in the interface pressure. The amount of momentum was estimated via the wave speed in the fluid-filled tube by taking into account the coupling of the fluid and the tube.