利用 FLUNET 软件，以 k-ε湍流模型封闭 Reynods 方程，采用 VOF 法追踪自由水面，对九龙峡水电站表孔溢流堰的水流按定常流动进行了三维数值模拟。结果表明：溢流堰的泄流能力、水面线、压力分布和流速分布等计算结果与模型试验实测结果吻合良好，说明数值模拟计算可以用于一些水工建筑物泄流计算和设计

 With software FLUENT, a k- ε turbulent model is used to simulate close Reynods equations and volume of fluid(VOF) method is adopted to track the free water surface, the flow state of overflow weir of Jiulongxia Hydropower Station is simulated by the method of three-dimensional numerical simulation according to the steady flow. The results show that the calculated results that the overflow weir discharge capacity, the water surface profile, the pressure distribution and velocity distribution are in good agreement with the measured data and numerical simulation can be used to some of the hydraulic structure calculations and designs.