Channel confluences are of the common structures in fluid transport channels. In this study, a series of numerical simulations were performed, utilizing a 3D code to investigate the reaction of the flow parameters and vortical structure to the variations in flow discharge and its Froude number from both main channel and tributary branch in a T-shape junction. The code was calibrated with the experimental data. Parameters, including the velocity, the turbulence energy, stream surface profile, head losses, and the transverse flow motions, were considered in different situations. It was concluded that increasing the ratio of discharge of flow from side-channel to the main channel (Q*) increased the area and power of the recirculation zone, as well as the width of separation plate downstream of the confluence, while it reduced the area of the stagnation zone (or the wake vortex) within the side-channel. It was also indicated that increasing the discharge ratio from side-channel resulted in an increase in the upstream water level in the main channels, which was dependent on the upstream discharge.

中文翻译：

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T形汇流处支流流量变化对流动行为的影响

通道汇合处是流体输送通道中的常见结构。在这项研究中，进行了一系列的数值模拟，利用3D代码研究了流动参数和旋涡结构对T形连接处主通道和支流的流量变化及其Froude数的反应。 。用实验数据校准代码。在不同情况下考虑了参数，包括速度，湍流能量，水流表面轮廓，水头损失和横流运动。得出的结论是，增加从侧通道到主通道的流量排放比（Q *）会增加再循环区的面积和功率，以及汇流下游的分离板宽度，同时减少了侧通道内停滞区（或尾流涡流）的面积。还表明增加侧通道的排放比导致主通道中上游水位的增加，这取决于上游排放。