This work uses the smoothed particle hydrodynamics (SPH) meshless numerical method in order to investigate the behaviour of a water sheet falling under gravity by reproducing the experimental results of a laboratory chute of 9.5 m height. This kind of flow occurs typically over dam ogee-type spillways. The focus is on the trajectory and velocity of the water sheet as well as on the pressure upon impact. Simulations using a combination of adaptive particle refinement, surface tension model and air friction model were tested. The SPH simulations with refinement show good agreement with the experimental pressure results for all comparisons, while using air friction allows correct modelling of the falling velocity distribution.

这项工作使用平滑粒子流体动力学 (SPH) 无网格数值方法，通过重现 9.5 m 高的实验室溜槽的实验结果来研究重力下水层的行为。这种流动通常发生在大坝型溢洪道上。重点是水层的轨迹和速度以及撞击时的压力。测试了使用自适应粒子细化、表面张力模型和空气摩擦模型相结合的模拟。对于所有比较，经过细化的 SPH 模拟与实验压力结果非常吻合，而使用空气摩擦可以正确模拟下落速度分布。