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

Song, Xiaolong; Chen, Youjun; Huang, Hai Ming; Xu, Haijue; Bai, Yuchuan; Zhang, Jinliang

doi:10.1080/19942060.2023.2234019

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…Brown and Crookston [42] discuss the numerical simulation of complex flow patterns in supercritical flows acknowledging challenges in instances where numerical estimations for flow depth can disagree by more than 50%. Contributions from Jia et al [43] and Song et al [44] further contribute to the understanding of large-scale vortices' evolution and recirculation zones, respectively, both critical components in the temporal and spatial exchange of mass and momentum in supercritical open channel flows. Nasif et al [40] attributed the three-dimensional nature of the turbulent flow and the inherent limitations and high cost of conventional experimental devices, which do not offer quantitative isosurfaces of velocity, pressure, and vorticity as a numerical approach.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Numerical Simulation of a Two-Phase Supercritical Open Channel Junction Flow

Blagojevič,

Hočevar,

Bizjan

et al. 2024

Water

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This study investigates the computational fluid dynamics (CFD) modeling of supercritical open channel junction flow using two different turbulence models: k-ω shear stress transport (SST) and k-ω SST scale-adaptive simulation (SAS), in conjunction with Volume of Fluid (VOF) and mixture multiphase models. The efficacy of these models in predicting the intricate free surface fluctuation and free surface elevation in a supercritical junction is evaluated through a comprehensive analysis of time-averaged free surface data obtained from CFD simulations and Light Detection and Ranging (LIDAR) measurements. The dimensionless Reynolds (Re) and Froude (Fr) numbers of the investigated scenario were Fr = 9 and Re = 5.1 × 104 for the main channel, and Fr = 6 and Re = 3.3 × 104 for the side channel. The results of the analysis demonstrated a satisfactory level of agreement with the experimental data. However, certain limitations associated with both CFD and LIDAR were identified. Specifically, the CFD performance was limited by the model’s incapacity to consider small-scale turbulent effects and to model air bubbles smaller than the cell size while the LIDAR measurements were limited by instrument range, inability to provide insight into what is happening below the water surface, and blind spots. Nonetheless, the k-ω SST turbulent model with the VOF multiphase model most closely matched the LIDAR results.

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Section: Introductionmentioning

confidence: 99%

Three-Dimensional Numerical Simulation of a Two-Phase Supercritical Open Channel Junction Flow

Blagojevič,

Hočevar,

Bizjan

et al. 2024

Water

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Experimental and numerical investigation of water flow behaviour in sharply curved 60° open‐channel bends

Seyedashraf,

Akhtari

2024

Earth Surf Processes Landf

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Understanding secondary flows in sharply curved open‐channel bends is key for analysing the flow patterns in rivers and and designing effective hydraulic structures. This study employs both experimental and computational methods to investigate the flow characteristics in a sharply curved 60° open‐channel bend. The primary objective is to enhance understanding of flow behaviours in such configurations. For numerical simulations, we utilize the Reynolds‐averaged Navier–Stokes equations, applying the volume‐of‐fluid free surface model to simulate air‐water interactions alongside the standard k‐ε and renormalized group (RNG) k‐ε turbulence models. Our findings reveal the emergence of helical currents driven by centrifugal forces at the bend's onset, which guide the fluid particles from the channel bottom to the convex (inner) bank and then to the concave (outer) bank at the surface. We observe a progressive increase in secondary flow intensity and energy dissipation along the bend, peaking at the terminal section. Notably, maximum flow velocity occurs near the convex wall accompanied by nonlinear water surface behaviours. Additionally, flow separation tendencies near the convex wall are noted after two‐thirds of the curvature. Quantitatively, the flow velocity at the convex bank was observed to be 1.70 times higher than at the concave bank within the bend. The mean absolute errors between experimental data and the standard k‐ε and RNG k‐ε models are 3.20 and 3.12, respectively, indicating the accuracy of the RNG k‐ε model.

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Research on the response characteristics and operation control of unsteady water transport in Huangchigou water distribution hub

Li,

Wu,

Wang

et al. 2024

Engineering Applications of Computational Fluid Mechanics

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

Cited by 3 publications

References 26 publications

Three-Dimensional Numerical Simulation of a Two-Phase Supercritical Open Channel Junction Flow

Three-Dimensional Numerical Simulation of a Two-Phase Supercritical Open Channel Junction Flow

Experimental and numerical investigation of water flow behaviour in sharply curved 60° open‐channel bends

Research on the response characteristics and operation control of unsteady water transport in Huangchigou water distribution hub

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