基于SPH的台阶式溢洪道最优消能率参数研究

为研究台阶式溢洪道的消能规律，明确台阶式溢洪道的最优消能率参数，利用DualSPHysics对台阶式溢洪道水流特征进行模拟，并通过与典型案例的对比分析验证了SPH方法对台阶式溢洪道水流模拟的适用性与准确性，模拟结果表明SPH方法可以较好地模拟台阶式溢洪道上的水流特征。通过建立不同单宽流量、台阶段坡度和台阶数目的共计288种工况对台阶式溢洪道消能规律及其影响因素进行了研究。结果表明：在其他条件一定的情况下，台阶式溢洪道的消能率与单宽流量呈负相关关系；台阶数目对台阶式溢洪道消能率的影响并不显著，但是存在一个台阶数目能使台阶式溢洪道的消能率达到最大值，该最优消能率对应的台阶数目在78~81阶范围内，此结论对指导实际工程应用有一定的参考价值。

Optimization of energy dissipation rate parameters of stepped spillways based on SPH

The flow characteristics of the stepped spillway is simulated by DualSPHysics in order to study the energy dissipation law and find the optimal parameters of the stepped spillway. Here, the applicability and accuracy of the smoothed particle hydrodynamics(SPH) method in the water flow simulation of the stepped spillway is verified through comparative analysis. Then, the energy dissipation law of the stepped spillway is studied by establishing a total of 288 working conditions with different single-width flow rates, stage gradients and the number of steps. The results show that the energy dissipation rate of the stepped spillway is negatively correlated with the single-width flow rate when the other parameters are constant; the number of steps has no significant effect on the energy dissipation rate of the stepped spillway, but there is a certain step number when the energy dissipation rate of the stepped spillway reaches the maximum value. According to the simulation results, the number of steps corresponding to the optimal energy dissipation rate is in the range of 78-81 steps. This conclusion has a certain referential value for the practical engineering.