基岩冲刷的数值模拟

Numerical simulation of scouring on bedrock

为了探索采用数值模拟的方法来研究基岩冲刷的可行性,对二维散粒体河床的冲刷进行了试验研究,并采用二维k-ε模型,在贴体非正交曲线坐标系中用控制体积法对散粒体河床的冲刷进行了数值模拟,计算的冲坑深度与试验结果符合很好,结果令人满意。选用相同的控制基岩冲刷的参数,对不同下游水垫深度、不同入射流速时基岩冲刷深度的正确模拟说明,在对基岩特性有了充分的了解后,用数值方法来模拟基岩的冲刷过程及估算冲刷深度是合理、可行的。

The problem about scouring on bedrock is one of important issue in hydraulics engineering. In order to know about the probability of numerical simulation of scouring on river bed, experiments are done; a set of mathematical model is developed; and the scouring on bedrock is simulated. The calculated results accord with the experimental data, which shows that the numerical simulation of scouring on bedrock is reasonable and feasible under the condition of knowing the characteristic of bedrock material.