基于CFD的防淘墙河床冲刷模拟方法

摘要

基于CFD技术,通过建立冲刷坑底部水流流速与床面颗粒临界起动流速之间的平衡关系,控制数值计算中的冲坑底部边界的变化,探讨了防淘墙周边深覆盖层河床冲刷模拟的方法.采用该方法对丁坝模型进行局部冲刷数值模拟,结果表明该方法可以较好地反映冲刷坑的位置、深度及底部轮廓.%In this paper, the equilibrium relationship between the flow velocity near the scour pit and the incipient velocity of the particles on a riverbed is set up based on CFD, which could be used to control the scour depth in the model so as to obtain the position and shape of the scour pit, and the method for simulating the scouring of the three-dimensional riverbed with thick alluvium deposit is established. The local scour around a submerged spur dike is numerically simulated here in through the method. The reasonableness of the simulation method is proved by the calculated results, which could match well with the experimental data.