分岔管道三维湍流水力特性数值模拟

建立了分岔管道水动力学的计算模型,求解三维贴体坐标系下水流控制方程。计算中采用修正的k-ε湍流模型,应用有限体积法离散方程,物理变量采用同位网格布置,控制体表面上各变量的值用界面动量插值法计算,速度-压力耦合计算采用SIMPLEC算法。本文应用该数值模型模拟了三维弯道水流的水力特性,并与模型试验实测值进行了比较,结果吻合较好。最后应用该数值模型预测了35°分岔管道连接区域三种流动情况的水力特性。

3D numerical simulation for hydraulic characteristics of turbulent flow in bifurcated duct

A 3D numerical model in boby-fitted coordinate system was established to investigate the hydraulic characteristics of turbulent flow in bifurcate duct. In the mathematical calculation the modified k-εturbulence model, finite volume method and collocated grid system were adopted. The flow parameters at the control surface were obtained by momentum interpolation method, and the SIMPLEC algorithm was used in coupling calculation of velocity field and stress. The 3D hydraulic characteristics of flows in a bend square duct were computed, and the comparison between numerical simulation results and experimental data shows that good agreement is achieved. Finally, the proposed model was used to predict the hydraulic characteristics of flows in a bifurcated square duct.