Abstract :
One of the essential components of any dam is the spillway, which stands as one of the oldest man-made hydraulic structures. It serves as a device designed for the measurement and regulation of water flow, facilitating the controlled passage of excess water and sediment from the upstream to the downstream. This structure finds extensive application in dam construction. Given the critical nature of its function, a stepped spillway demands robust and reliable instruments to ensure high efficiency, ready for use at any moment. Providing crucial information about the behaviour of this significant structure, including flow characteristics such as the flow curve, water level profile, pressure, and velocity pattern at different points of the flow, is essential for its design, monitoring, and safety program. In this research, the Fluent software was employed, utilizing the RSM turbulence mode for simulating the flow on both Ogee and stepped spillways. The comparison of energy loss in these spillways was conducted, employing the VOF model to trace the free flow surface. The obtained results were validated using previous researchers’ studies.
Keywords :
Energy Dissipation, Fluent, RSM Turbulence Model, Stepped Spillway.References :
- Xiong K, Weng Y hong, He Y long. Seismic failure modes and seismic safety of Hardfill dam. Water Science and Engineering. 2013 Apr 1;6(2):199–214.
- Jin F, Hu W, Pan J, Yang J, Wang J, Zhang C. Chapter 19 – Comparative Study Procedure for the Safety Evaluation of High Arch Dams1. In: Zhang C, Jin F, Wang J, Xu Y, editors. Seismic Safety Evaluation of Concrete Dams [Internet]. Butterworth-Heinemann; 2013 [cited 2023 Nov 21]. p. 429–58. Available from:
https://www.sciencedirect.com/science/article/pii/B9780124080836000192
- Stefanovski JD, Dimirovski GM. Automated Open-Canal Water-Supply Systems. IFAC Proceedings Volumes. 2001 May 1;34(3):189–94.
- Ahmad M ud D, Stein A, Bastiaanssen WGM. Estimation of disaggregated canal water deliveries in Pakistan using geomatics. International Journal of Applied Earth Observation and Geoinformation. 2004 Nov 1;6(1):63–75.
- Chatila J, Tabbara M. Computational modeling of flow over an ogee spillway. Computers & Structures. 2004 Sep 1;82(22):1805–12.
- Tabbara M, Chatila J, Awwad R. Computational simulation of flow over stepped spillways. Computers & Structures. 2005 Oct 1;83(27):2215–24.
- Wang Z, Bowles DS. Dam breach simulations with multiple breach locations under wind and wave actions. Advances in Water Resources. 2006 Aug 1;29(8):1222–37.
- Gualtieri C, Chanson H. Physical and numerical modelling of air-water flows: An Introductory Overview. Environmental Modelling & Software. 2021 Sep 1;143:105109.
- Yu S, Yue F, Zhang Q, Chen Z, Yin P, Hao J, et al. Geobag stepped spillway for check dams: A pilot study. International Journal of Sediment Research. 2023 Feb 1;38(1):115–27.
- Reeve DE, Zuhaira AA, Karunarathna H. Computational investigation of hydraulic performance variation with geometry in gabion stepped spillways. Water Science and Engineering. 2019 Mar 1;12(1):62–72.
- Coker AK. CHAPTER 1 – Numerical Computation. In: Coker AK, editor. Fortran Programs for Chemical Process Design, Analysis, and Simulation [Internet]. Houston: Gulf Professional Publishing; 1995 [cited 2023 May 29]. p. 1–102. Available from: https://www.sciencedirect.com/science/article/pii/B9780884152804500029
- Kamyab Moghaddam A, Hamedi A, Amirahmadian S. Experimental Study of Energy Loss in a Stepped Spillway Equipped with Inclined Steps in the Nappe and Skimming Flow Regimes. International Journal of Science and Engineering Applications. 2022;11(12):346–50.
- Chanson H, Aoki S ichi, Maruyama M. Unsteady air bubble entrainment and detrainment at a plunging breaker: dominant time scales and similarity of water level variations. Coastal Engineering. 2002 Jul 1;46(2):139–57.
- Takahashi M, Gonzalez CA, Chanson H. Self-aeration and turbulence in a stepped channel: Influence of cavity surface roughness. International Journal of Multiphase Flow. 2006 Dec 1;32(12):1370–85.
- Narayanan V, Seyed-Yagoobi J, Page RH. An experimental study of fluid mechanics and heat transfer in an impinging slot jet flow. International Journal of Heat and Mass Transfer. 2004 Apr 1;47(8):1827–45.
- Rao SS. 17 – Basic Equations of Fluid Mechanics. In: Rao SS, editor. The Finite Element Method in Engineering (Fourth Edition) [Internet]. Burlington: Butterworth-Heinemann; 2005 [cited 2023 Nov 21]. p. 557–74. Available from: https://www.sciencedirect.com/science/article/pii/B9780750678285500184