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明渠干支流交汇口包含了许多重要的水流现象,在污水处理厂和过鱼建筑物等水利设施中经常遇到。本文采用k-ω紊流模型对90°明渠交汇口三维流场进行了模拟,运用双曲正切扩展函数法构造动态网格来跟踪自由水面,将模拟的结果与实验数据进行了对比,吻合良好,成功捕捉到了交汇口水面变化及二次流等主要水流特性。分析了交汇口分离区形状参数、支渠入流角及断面收缩系数与干支渠流量比之间的关系,并与前人的研究成果进行了比较。
The open channel tributary intersection contains many important current phenomena commonly encountered in water conservancy facilities such as sewage treatment plants and over-fishing structures. In this paper, the k-ω turbulence model is used to simulate the three-dimensional flow field at 90 ° open channel confluence, and the dynamic grid is constructed by using the hyperbolic tangent expansion function to track the free surface. The simulation results are in good agreement with the experimental data , Successfully captured the main water flow characteristics such as water surface changes at junction and secondary flow. The relationship between the shape parameters of the junction separation zone, the inflow angle of the branch canal, the coefficient of contraction of the section and the flow ratio of the branch and canals was analyzed and compared with previous research results.