大规模输水隧道水锤效应三维数值模拟

Three-Dimensional Simulation of Water Hammer of Large-Scale Water Conveyance Tunnel

为研究大型输水隧道的水锤效应,提出基于任意拉格朗日欧拉(ALE)流固耦合技术的三维水锤分析方法,并通过算例与实验结果进行相互对比,验证了该仿真方法的有效性.基于多尺度仿真技术,建立了某大型输水隧道土体-结构-水体三维耦合非线性有限元模型,并利用所述分析方法,结合混合显式积分算法及其并行技术完成三维水锤效应的模拟计算.结果表明,水锤压力随阀门关闭时间延长及隧道长度减少而减小;隧道结构受水锤影响最大的部分出现在靠近出口处.

To study the water hammer phenomena of the large-scale water conveyance tunnel,a three-dimensional water hammer analysis method was proposed based on the ALE（arbitrary Lagrangian-Eulerian）fluid structure interaction technique.The validity of the method was verified by comparing the simulation and experimental results of a case.Based on the multi-scale simulation technique,the soil-structure-water coupled three-dimensional nonlinear finite element model of a large-scale water conveyance tunnel was established.Besides,its calculation was accomplished using the proposed method in combination with the mixed time explicit integration algorithm and its parallel technique.The results show that water hammer pressure decreases with the increase of valve closing time and shortening of tunnel length,and that the lining structure bearing maximum influence under water hammer is near the outlet of the tunnel.