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本文利用大涡模拟方法，对三峡溢流坝下游平衡冲刷坑内的二维流场结构进行了数值模拟，探讨了射流在冲坑水垫中的扩散规律和流谱结构，分析了冲坑底流速和压力的沿程分布及坑底不同测点脉动压力的统计特征，并与试验结果进行了比较．在数值模拟中，采用了弱压缩流的控制方程，用贴体座标技术进行了网格生成．
In this paper, a large eddy simulation method is used to simulate the two-dimensional flow field in the balance scouring pit downstream of the Three Gorges spill dam. The diffusion and jet flow structure of the jet in the scour pit are discussed. And the distribution of pressure along the path and the statistical characteristics of the pulsating pressure at different pit measuring points were compared with the experimental results. In the numerical simulation, the control equation of weakly compressed flow is adopted, and the mesh generation is carried out by using the body coordinate technique.