中文摘要：

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。

英文摘要：

The three-dimensional k-ε model for turbulence flow was used to investigate the flow at 90° open-channel junction,and the hyperbolic tangent stretching function was adopted to regenerate the mesh for obtaining the free surface elevation.The validity of the model was verified by experimental data.The main characteristics,such as the variation of free-surface elevation and the secondary current,were obtained successfully.Then,the effects of discharge ratio on the shape indexes,the cross-section mean flow angl...