Author(s): Ruichang Hu; Lan Yang; Zongjiang Zhang; Haifeng Tian
Linked Author(s): Ruichang Hu
Keywords: U-shape channel; Secondary flow; Separation zone; Confluent tributary
Abstract: Confluent flow exists widely in nature, and its complex flow structure has obvious effect on sediment transport and pollutant accumulation. In this study, the renormalization group (RNG) k - ε turbulence model is employed to carry out numerical simulation of U-shaped channel with different confluence hydraulic conditions. Subsequently, the structure and development of secondary flows and separation zone is analyzed by changing the morphology of incoming tributaries, such as straight channel or bend. The results show that the curved tributary can change the flow structure, changing the influence of the tributary on the flow structure of U-shaped channel. When the confluent tributary changes from straight to curved, the secondary flow near the inner bank in the confluent area moves to the outer, and the separation zone range with curved tributary is obviously smaller than that of curved tributary. This work can provide scientific basis for improving the riverbed morphology and aquatic animal ecology of natural river by using confluence estuary.
Year: 2024