思林水电站土石围堰过水流场三维数值模拟

基于通用计算流体动力学软件Fluent，建立思林水电站土石围堰过水流场三维数值预测模型．采用可实现（realizable）κ-ε紊流模型封闭紊流时均N—S方程，围堰上自由水面变化采用VOF方法捕捉．对围堰原设计方案进行了计算模拟，并用试验数据进行验证．依据计算所得的详细流场信息，给出了围堰过水流场的流态和堰面紊动强度分布及大小，以及水跃的形态和发生位置．研究表明可靠的三维水动力数值模型可以做为试验研究的有力补充，有助于理解复杂的过水围堰三维流场以及冲刷发生的机理．

3D numerical simulation of overtopping flow field for earth-rockfill cofferdam of Silin hydropower station

A 3D hydrodynamic model based on CFD code Fluent is developed to predict the overtopping flow fields of earth-rockfill cofferdam of Silin hydropower station. The realizable κ-ε model is adopted for turbulent closure of the RANS equations, and the variation of the water surface on the cofferdam is solved using the VOF method. The original design schemes are computed and validated by the physical experimental data. Depending on the detailed computed flow fields, the flow patterns and turbulence intensity distribution on the cofferdam, the occurrence location and the morphology of hydraulic jump are presented. The study demonstrates that a robust 3D hydrodynamic model can effectively supplement experimental studies in understanding the complex flow fields and the scour mechanism.