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水轮机流道内的三维粘性流数值计算模型是建立在雷诺平均的Ｎａｖｉｅｒ － Ｓｔｏｋｅｓ 方程的基础上，采用ｋ － ε紊流模型封闭方程，进行贴体坐标变换以提高计算精度．用有限体积法在非交错网格上对方程进行离散，对贴体坐标系中控制界面上的速度进行特殊加权处理，可有效地避免压力波动现象
Based on the Reynolds - averaged Navier - Stokes equations, the numerical model of three - dimensional viscous flow in the runner is established. The k - ε turbulence model is used to close the equation, and the body coordinate transformation is performed to improve the calculation precision. The finite volume method is used to discretize the equations on the non-staggered grids. The velocity of the control interface in the body coordinate system is specially weighted to effectively avoid the phenomenon of pressure fluctuations