Numerical Investigation of Modified Semi-Cylindrical Weirs

Ehsan Afaridegan, Nosratollah Amanian, AmirHamzeh Haghiabi, Abbas Parsaie () and Alireza Goodarzi-Mohammadi
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Ehsan Afaridegan: Yazd University
Nosratollah Amanian: Yazd University
AmirHamzeh Haghiabi: Lorestan University
Abbas Parsaie: Shahid Chamran University of Ahvaz
Alireza Goodarzi-Mohammadi: Petroleum University of Technology

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2023, vol. 37, issue 9, No 19, 3715-3728

Abstract: Abstract In this study, the flow characteristics over modified semi-cylindrical weirs (MSCM) were investigated using computational fluid dynamics (CFD) simulations. The simulations included the analysis of flow velocity and pressure distribution, turbulence intensity, and streamline patterns. The numerical results were compared to laboratory observations, and a good agreement was observed. Different turbulence models, including renormalized group (RNG) k-ε, standard k-ε, k-ω two-equations, and large eddy simulation (LES), were evaluated, and all showed suitable performance in simulating the flow field and hydraulic characteristics. However, the standard k-ε model outperformed the other models. The analysis of streamline patterns from upstream to downstream of the weirs showed that the curve of the crest provided an opportunity for the flow to harmonize with the surface of the crest. The downstream ramp guided the streamlines, preventing collision with the downstream slab surface and vorticity formation. Additionally, the results indicated that adding the downstream ramp significantly reduced the turbulence intensity of the flow at the toe of the weirs. The analysis of pressure distribution showed that the flow departed from hydrostatic state when reaching the weir, and the maximum deviation occurred at the crest vertex.

Keywords: Circular weir; CFD simulation; Turbulence model; Turbulence intensity (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s11269-023-03523-y

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