Abstract Fluid–structure interaction (FSI) and wave propagation in engineering structures can cause severe damage to piping systems or fluid machines, inducing serious accidents. In these phenomena, the mechanism of structural damage depends on the wave propagation across the fluid–solid interface. Previous studies reported that disagreements between the induced pressure value on the solid–fluid movable interface and the value predicted by the classical one-dimensional theory arose from the effects of two-dimensional wave propagation. To address this problem, in this study, a two-dimensional axisymmetric simulation of wave propagation across the solid-fluid interface with FSI was conducted. The simulation was performed using ANSYS Autodyn with a Lagrangian solver for solids and Eulerian solver for water. The results showed that radial wave propagation caused by the dynamic effect of the tube and water's inertia affected the peak pressure on the solid–fluid interface. The peak pressure was attenuated near the tube wall because of the inertial effect of the tube and fluid expansion. By calculating the mean pressure and axial stress to compare the simulated peak pressure with that from one-dimensional acoustic theory, it was indicated that the transition region for transmitted pressure was located immediately after the solid–fluid interface. In this region, the transmitted peak pressure may exceed the value predicted by one-dimensional acoustic theory. The transition region was oriented in the axial direction from the interface. In addition, prediction of the transmitted peak pressure with one-dimensional acoustic theory was suggested via normal wave speed in the unconfined fluid from a safety engineering perspective, although the circumferential stress generated in the tube enclosing fluid can be sufficiently accurately predicted using the same theory with the Korteweg speed.

中文翻译：

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圆管中流固耦合波在固液界面传播的数值分析

摘要 工程结构中的流固耦合（FSI）和波传播会对管道系统或流体机械造成严重损坏，引发严重事故。在这些现象中，结构损坏的机制取决于波在流固界面上的传播。先前的研究报告说，固-流体可移动界面上的诱导压力值与经典一维理论预测的值之间的不一致源于二维波传播的影响。为了解决这个问题，在本研究中，使用 FSI 对波在固-流界面上的传播进行了二维轴对称模拟。模拟是使用 ANSYS Autodyn 和拉格朗日固体求解器和欧拉求解器进行的。结果表明，管的动力效应和水的惯性引起的径向波传播影响了固液界面上的峰值压力。由于管和流体膨胀的惯性效应，峰值压力在管壁附近衰减。通过计算平均压力和轴向应力，将模拟的峰值压力与一维声学理论的峰值压力进行比较，表明传递压力的过渡区位于固液界面之后。在该区域，传输的峰值压力可能超过一维声学理论预测的值。过渡区从界面沿轴向定向。此外，