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FLOW-3D Model Development for the Analysis of the Flow Characteristics of Downstream Hydraulic Structures

Author

Listed:
  • Beom-Jin Kim

    (Advanced Structures and Seismic Safety Research Division, Korea Atomic Energy Research Institute, Daejeon 34057, Korea)

  • Jae-Hong Hwang

    (Korea Water Resources Corporation (K-Water), Daejeon 34350, Korea)

  • Byunghyun Kim

    (Department of Civil Engineering, Kyungpook National University, Daegu 41566, Korea)

Abstract

Hydraulic structures installed in rivers inevitably create a water level difference between upstream and downstream regions. The potential energy due to this difference in water level is converted into kinetic energy, causing high-velocity flow and hydraulic jumps in the river. As a result, problems such as scouring and sloping downstream may occur around the hydraulic structures. In this study, a FLOW-3D model was constructed to perform a numerical analysis of the Changnyeong-Haman weir in the Republic of Korea. The constructed model was verified based on surface velocity measurements from a field gate operation experiment. In the simulation results, the flow discharge differed from the measured value by 9–15 m 3 /s, from which the accuracy was evaluated to be 82–87%. The flow velocity was evaluated with an accuracy of 92% from a difference of 0.01 to 0.16 m/s. Following this verification, a flow analysis of the hydraulic structures was performed according to boundary conditions and operation conditions for numerous scenarios. Since 2018, the Changnyeong-Haman weir gate has been fully opened due to the implementation of Korea’s eco-environmental policy; therefore, in this study, the actual gate operation history data prior to 2018 was applied and evaluated. The evaluation conditions were a 50% open gate condition and the flow discharge of two cases with a large difference in water level. As a result of the analysis, the actual operating conditions showed that the velocity and the Froude number were lower than the optimal conditions, confirming that the selected design was appropriate. It was also found that in the bed protection section, the average flow velocity was high when the water level difference was large, whereas the bottom velocity was high when the gate opening was large. Ultimately, through the reviewed status survey data in this study, the downstream flow characteristics of hydraulic structures along with adequacy verification techniques, optimal design techniques such as procedures for design, and important considerations were derived. Based on the current results, the constructed FLOW-3D-based model can be applied to creating or updating flow analysis guidelines for future repair and reinforcement measures as well as hydraulic structure design.

Suggested Citation

  • Beom-Jin Kim & Jae-Hong Hwang & Byunghyun Kim, 2022. "FLOW-3D Model Development for the Analysis of the Flow Characteristics of Downstream Hydraulic Structures," Sustainability, MDPI, vol. 14(17), pages 1-17, August.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:17:p:10493-:d:895369
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    References listed on IDEAS

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    1. Asad Ullah & Ikramullah & Mahmoud M. Selim & Thabet Abdeljawad & Muhammad Ayaz & Nabil Mlaiki & Abdul Ghafoor, 2021. "A Magnetite–Water-Based Nanofluid Three-Dimensional Thin Film Flow on an Inclined Rotating Surface with Non-Linear Thermal Radiations and Couple Stress Effects," Energies, MDPI, vol. 14(17), pages 1-19, September.
    2. Doaa Rizk & Asad Ullah & Ikramullah & Samia Elattar & Khalid Abdulkhaliq M. Alharbi & Mohammad Sohail & Rajwali Khan & Alamzeb Khan & Nabil Mlaiki, 2022. "Impact of the KKL Correlation Model on the Activation of Thermal Energy for the Hybrid Nanofluid (GO+ZnO+Water) Flow through Permeable Vertically Rotating Surface," Energies, MDPI, vol. 15(8), pages 1-16, April.
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    Cited by:

    1. Muhammad Waqas Zaffar & Ishtiaq Hassan & Umair Latif & Shah Jahan & Zeeshan Ullah, 2023. "Numerical Investigation of Scour Downstream of Diversion Barrage for Different Stilling Basins at Flood Discharge," Sustainability, MDPI, vol. 15(14), pages 1-23, July.

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