基于流固耦合的水力瞬变三维模拟及管壁动态应力分析

水力瞬变也称为水锤，是由于管道内压力瞬间升高，压力波在管道内以声速传递的现象。紧随着压力波，管壁上产生动态应力，进而导致管道失效。基于ALE流固耦合方法模拟由于阀门突然关闭导致的管道中流体冲击波，并与一维水锤冲击波理论值进行了对比。在此基础上分析了不同约束条件下，距离管道末端一定距离，由于管壁变形和振动而产生的三维动态应力。发现在水锤波传播过该位置一段时间之后，管壁应力才达到最大值，此外管壁周向应力在动态应力中影响是最主要的。

Three-dimensional simulation of hydraulic transient and dynamic stress analysis of pipe in consideration of fluid-structure interaction

Owing to the pressure wave caused by hydraulic transients, known as water hammer, dynamic stresses are created in the pipe wall, which contribute to pipe failure. ALE analysis method was used to simulate the three-dimensional fluid-structure interaction (FSI) during the water hammer event, and the results were compared with the one-dimensional results. On this basis, the three-dimensional dynamic stresses that result from pipe wall vibration at a distance from the end of a pipe was illustrated. It is proved that when the maximum stress appears, the pressure wave has already passed away. The hoop stress is the most dominant in all kinds of dynamic stresses.