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首页> 外文期刊>Journal of Hydroinformatics >Numerical study of 3D flow at right-angled confluences with and without upstream planform curvature
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Numerical study of 3D flow at right-angled confluences with and without upstream planform curvature

机译：具有和不具有上游平面曲率的直角汇合处3D流动的数值研究

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The purpose of this paper is to study the individual and combined effect of upstream planform curvature and difference in bed elevations at the tributary entrance to the confluence on the flow in the confluence hydrodynamics zone. To do this, flow at right-angled confluences with three planforms and four values of bed elevation discordance ratio (△Z_T/h_d) is simulated using a three-dimensional (3D) numerical model. Three confluence planforms include confluences with the (1) straight tributary canal (SC), (2) right bend (RB) and (3) left bend (LB) in the tributary. Four △Z_T/h_d values in the range [0.0,0.5] include both concordant and discordant beds' confluences. Overall, nine cases with the straight main canal are considered. Special attention is paid to the flow deflection and flow separation zones since the former affects transfer of momentum from the tributary to the main canal and the latter affects transport capacity of the post-confluence channel. Comparison of the results reveals that the influence of RB in the tributary is practically negligible in comparison to the straight canal case. With the increasing difference in bed elevations between the tributary and main canals (△Z_T), the presence of LB strengthens 3D flow and the structure of the recirculation zone is destroyed.
机译：本文的目的是研究汇流流体动力学区中上游平面弯度和汇流支流入口处河床高程差的个体和综合影响。为此，使用三维（3D）数值模型模拟了具有三个平面形式和四个床高程不协调比（△Z_T / h_d）值的直角汇合处的流动。三种汇合平面形式包括与支流中的（1）直支渠（SC），（2）右弯（RB）和（3）左弯（LB）的汇合。在[0.0,0.5]范围内的四个△Z_T / h_d值包括一致和不一致床的汇合。总体而言，考虑了9条直管总管病例。由于前者会影响动量从支流到主干道的转移，而后者会影响汇合后通道的运输能力，因此应特别注意流动偏向和分流区域。结果比较表明，与直管病例相比，RB在支流中的影响实际上可以忽略不计。随着支流和干渠之间河床高程差的增加（△Z_T），LB的存在增强了3D流动，并破坏了回流区的结构。

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