生态放水洞水力特性三维数值模拟

Three-Dimensional Numerical Simulation of Hydraulic Characteristics of Ecological Drainage Tunnel

采用气液两相流混合模型,辅以标准k-ε紊流模型封闭时均方程组,利用VOF(Volume of fluid)法捕捉自由水面,速度与压力耦合方程组求解时使用半隐式SIMPLE(Semi-Implicit Method for Pressure-Linked Equations)算法,对某水电站生态放水洞进行数值模拟,得到不同水位下满足泄量的开度,并得到不同水位的流量、流态、流线、流速和压强的分布规律。数值模拟结果与模型试验成果符合较好,进一步验证了设计闸门孔口尺寸的合理性,对工程应用提供参考依据,并具有实际意义。

The gas-liquid two-phase flow model is used together with the standard k-ε turbulence model to close the time-average equations. The free water surface is captured by the VOF( Volume of Fluid) method. Coupled equations of velocity and pressure is solved by the SIMPLE( Semi-Implicit Method for Pressure-Linked Equations) algorithm,thus to perform numerical simulation of the ecological drainage tunnel of a hydropower station,and the opening degree of the discharge under different water levels is obtained with the flow,flow pattern,flow lines,flow rate and the distribution of pressure. The numerical simulation results are in good agreement with the model test results,which further validates the rationality of gate aperture size in the design,provides reference for engineering application and has certain practical significance.