论文标题
圆形管中流体结构相互作用的固体界面跨固体界面的波传播的数值分析
Numerical analysis of wave propagation across Solid-Fluid interface with Fluid-Structure interaction in circular tube
论文作者
论文摘要
工程结构中的流体结构相互作用（FSI）和波传播可能会对管道系统或流体机造成严重损害，从而引起严重的事故。在这些现象中，结构损伤的机理取决于流体固定界面的波传播。先前的研究报告说，诱导的压力值对固体可移动界面的压力值与经典一维理论预测的值之间的分歧是源于二维波传播的影响。为了解决这个问题，在这项研究中，对与FSI进行了固体流体界面的波传播的二维轴对称模拟。使用ANSYS AUTODYN和Lagrangian求解器进行固体和欧拉求解器进行仿真。结果表明，径向波的传播是由管子和水的惯性的动态作用引起的，影响了固体流体界面上的峰值压力。由于管子的惯性作用和流体膨胀，峰值压力在管壁附近衰减。通过计算平均压力和轴向应力，以将模拟峰压力与一维声学理论进行比较，可以表明，透射压力的过渡区域是在固体流体界面之后立即定位的。在该区域，传输的峰压力可能超过一维声学理论预测的值。从界面从轴向方向沿轴向方向定向。此外，从安全工程的角度，通过正常波速度通过正常波速度提出了对传播峰值压力的预测，尽管可以通过与Kortew速度相同的理论充分准确地预测了管子封闭流体中产生的圆周应力。
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.
