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Numerical Investigation of Modified Semi-Cylindrical Weirs

Author

Listed:
  • 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)

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.

Suggested Citation

  • Ehsan Afaridegan & Nosratollah Amanian & AmirHamzeh Haghiabi & Abbas Parsaie & Alireza Goodarzi-Mohammadi, 2023. "Numerical Investigation of Modified Semi-Cylindrical Weirs," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(9), pages 3715-3728, July.
    • Handle: RePEc:spr:waterr:v:37:y:2023:i:9:d:10.1007_s11269-023-03523-y
    DOI: 10.1007/s11269-023-03523-y
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    References listed on IDEAS

    as
    1. Veysi Kartal & M. Emin Emiroglu, 2023. "Hydraulic Performance of Sharp-Crested Side Slit Weirs," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 37(3), pages 1297-1319, February.
    2. Abdol Mahdi Behroozi & Mohammad Vaghefi, 2022. "Experimental and Numerical Study of the Effect of Zigzag Crests with Various Geometries on the Performance of A-type Piano Key Weirs," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 36(12), pages 4517-4533, September.
    3. Amiya Abhash & K. K. Pandey, 2021. "Experimental and Numerical Study of Discharge Capacity and Sediment Profile Upstream of Piano Key Weirs with Different Plan Geometries," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 35(5), pages 1529-1546, March.
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