基于SPH方法的过闸水流数值模拟

Numerical Simulation of Flow Through Sluice Based on SPH Method

针对过闸水流问题,基于光滑粒子流体动力学方法(SPH),对边界处理方法进行了改进,重新率定了排斥力主要参数,当n1=4、n2=2时,可避免非物理振荡现象的出现;同时,对补水模式进行了比选研究,明确了在最优补水模式为3 m高程差的底孔补水模式,可减少上游水体粒子的净流出。在此基础上,建立了过闸水流冲击下游消力池的数值模型,模拟了过闸水流流出水闸至跃出消力池的过程。结果表明,初始时刻上游水域底部最大压强为127.4 kPa,第7 s时消力池右端断面平均流速为7.07 m/s, 19 s时消力池右端断面平均流速减小到1.4 m/s。可见SPH方法能准确模拟出泄流过程流速压强及流态变化情况。

Aiming at the problem of sluice flow,based on the smooth particle hydrodynamics method(SPH),the boundary treatment method was improved,and the main parameters of repulsion force were re-calibrated,which can avoid non-physical oscillation with n_1=4 and n_2=2.At the same time,the comparison and selection of water replenishment modes were carried out,and it was clear that the bottom hole water replenishment mode with 3 m elevation difference in the optimal water replenishment mode can reduce the net outflow of particles from the upstream water body.On this basis,the numerical model of the flow through the gate impacting the stilling pool downstream was established,and the process of the flow from the sluice to the stilling pool was simulated.The results show that at the initial time,the maximum pressure at the bottom of the upstream water is 127.4 kPa;At the 7th second,the average velocity at the right end of the stilling pool is 7.07 m/s,at the 19th second,the average velocity at the right end of the stilling pool decreases to 1.4 m/s.Thus,the SPH method can accurately simulate the changes of flow velocity,pressure and flow pattern in the discharge process.