Academic Journal
Effects of tributary confluence location on flow structure in a curved confluence flow.
| Τίτλος: | Effects of tributary confluence location on flow structure in a curved confluence flow. |
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| Συγγραφείς: | Hu, Ruichang1,2 (AUTHOR), Yang, Lan2 (AUTHOR), Tian, Haifeng3 (AUTHOR), Huang, Wei2 (AUTHOR), Yuan, Hao1,2 (AUTHOR) yuanhao@cqjtu.edu.cn |
| Πηγή: | Physics of Fluids. Sep2026, Vol. 38 Issue 9, p1-21. 21p. |
| Θεματικοί όροι: | *Flow separation, *Streamflow velocity, *Turbulence, *Three-dimensional flow, *Hydrodynamics |
| Περίληψη: | Curved confluent channels are widely distributed in natural river networks, where tributaries enter the main channel at different confluence locations. To investigate the effects of the tributary confluence location on the flow structure in the confluence, a numerical model based on the validated renormalization group k–ε turbulence model is established. The effects of tributary confluence locations (θ) and flow ratios (q*) on the water surface elevation (WSE), longitudinal velocity distribution (u), separation zone, and secondary flow were systematically examined. The results show that the WSE increases with increasing q* in the upstream of the confluence, while it decreases in the downstream. Regarding the velocity distribution, θ alters the direction of the transverse velocity (v) in the confluence and the position of the maximum velocity zone. In contrast, increasing q* enhances the longitudinal velocity (u) and enlarges the maximum velocity zone. In addition, the scale of the separation zone increases with increasing q*. As θ increases, the separation zone scale initially increases and then decreases, reaching relatively large values near θ = 90°–120°. The secondary flow primarily consists of the inner bank circulation and the outer bank circulation. The mean secondary flow intensity ( S w ¯ ) reaches its peak value downstream of the confluence, and the peak value increases with increasing q*. The dimensionless flow recovery distance ( X r * ) exhibits a unimodal variation with q* and θ. These findings advance the understanding of momentum redistribution, the three-dimensional structure of the separation zone, and secondary flow evolution in curved confluent channels. [ABSTRACT FROM AUTHOR] |
| Βάση Δεδομένων: | Academic Search Index |
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