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为分析汊道口门处水流结构对悬移质分沙的影响,采用带旋流修正的k-ε双方程紊流模型,对分汊河道分流口门处的三维水流结构进行精确计算,并在此基础上,采用可考虑相间滑移的混相流模型对不同形态分汊河道的悬移质分沙进行计算。计算结果显示了分汊口门处表底层水流的差异及横向环流的存在等现象,与前人的实验值吻合良好。计算结果表明,分汊口门处的环流强弱和悬移质垂线分布是影响汊道分沙比与分流比关系的主要因素。
In order to analyze the effect of water flow structure on the suspended sediment at the mouth of the mouth, the k-ε two-equation turbulence model with swirling correction was adopted to accurately calculate the three-dimensional water flow structure at the outlet of the diversion channel. On this basis, the mixed-phase flow model that can consider interphase slip is used to calculate the suspended sediment of different forms of sub-channel. The calculation results show the difference of bottom water flow and the existence of transverse circulation in the entrance of sub-inlet, which is in good agreement with the previous experimental data. The calculation results show that the vertical circulation and the vertical distribution of suspended sediment at the entrance of the sub-juncture are the main factors that affect the relationship between the ratio of confluence and diversion.