水库放空问题数值模拟研究

Numerical Simulation Study on Reservoir Venting Issue

分别通过二维与三维数值计算,对工程中的水库放空问题进行了模拟计算,结合理论分析,论证数值计算对该类问题的适用性。研究结果表明:利用RNG k-ε紊流模型和标准壁面函数模拟非恒定紊流,利用VOF模型追踪水流自由界面可以得到精度较高的放空全时域过程,且三维计算精度要显著高于二维计算,但是对于精度要求相对不高的实际工程问题,二维计算不失为一种经济高效的方法。

The two-dimensional and three-dimensional numerical calculations are used to simulate the reservoir emptying problem in the project,and the theoretical analysis is used to demonstrate the applicability of the numerical calculation to this type of problem.The research results show that:using RNG k-εturbulence model and standard wall functions to simulate non-constant turbulence,and tracking the free interface of water flow with VOF model,a full-time venting process with higher accuracy can be obtained.Dimensional calculation,but for practical engineering problems with relatively low accuracy requirements,2 D calculation is a cost-effective method.