Y型明渠交汇水流分离区的数值分析

针对Y型明渠交汇口的水流特性,应用三维各向异性的雷诺应力模型,采用交错网格上的有限体积法离散控制方程,用SIMPLE算法求解压力-速度场。数值计算结果与物理模型试验结果吻合较好,并据此重点探讨了不同交汇角条件下交汇口分离区尺寸的变化规律,提出Y型交汇水流分离区的定义和分离区尺寸与汇流比的函数关系。

Numerical analysis of flow separation zone at junctions of Y-shaped open channels

According to the flow characteristics at junctions of Y-shaped open channels,the 3D anisotropic Reynolds stress model was adopted in this study.The staggered grids-based finite volume method was used to discrete the control equation,and then the pressure-velocity field was solved with the SIMPLE algorithm.The model was verified with the relevant experimental data which were in conformity with the numerical result.After that,the variation law of the size of Y-shaped separation zones at junctions was discussed under different confluent angles,and the definition of Y-shaped separation zones as well as the relationship between the size of the separation zones and confluence ratio was put forward.