Turbulent flow simulations in a simplified channel bend model of Dragon style rivers with constant curvature and different single-short-branch characteristics

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چکیده

This study investigates the turbulent flows in simplified Dragon style river channels with a constant critical curvature and different single-short-branch characteristics, using an effective numerical method based on real geometry statistics. First, when branch outlet is closed, main channel, strong bed shear stresses are concentrated at inner bend apex downstream; as widens, more flow enters branch, reducing downstream velocities, increasing helical strength (I) kinetic energy (TKE); however, radius about 3.5 times channel width, opposite occurs. Second, this non-free-flowing upstream of section, cross-sectional I TKE increase but both decrease or decreasing orientation angle (relative to direction tangent channel). Third, open, bifurcation location primarily affects flow, moving it creates regular low-velocity zone recirculation zone, lower downstream, meanwhile, I, TKE, location, respectively. Finally, free-flowing occupy branch; grows reaches maximum around relative 3.0 (scaled main-channel width), disappears 67°; become negative, graphical (along direction) curves downward upward radius, straightens angle. Findings provide fundamental conditions for harmonious vegetative integration gradual development regulation patterns, especially mitigate crises like ‘suspended river’ issues Yellow River.

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ژورنال

عنوان ژورنال: Engineering Applications of Computational Fluid Mechanics

سال: 2023

ISSN: ['1997-003X', '1994-2060']

DOI: https://doi.org/10.1080/19942060.2023.2234019