• AMOL HANMANTRAO GAIKWAD
• Amit Kulhare
• P. T. Nimbalkar

Spillway flows are essentially rapidly varying flows which are very complex in nature and can be studied through both physical and numerical modeling techniques. Physical modeling techniques have been extensively used in finalizing the design of spillways and energy dissipators for dams over the years and they are indispensable. However, through recent advances in computing power and modeling software capabilities, it is now feasible to undertake complex three-dimensional analysis using Numerical/Computational Fluid Dynamics (CFD) techniques. The major benefit of the CFD modeling is that it allows early identification of problematic flow features and modifications to the design/layout could be tried rapidly and cost-effectively. This paper describes the Hydraulic model studies conducted on a 1:45 scale 2-DPhysicalmodel to optimize the design of orifice spillway for a Run-off-the river Hydroelectric Project in Bhutan. Numerical model studies are carried out to assess the performance of spillway using CFD software, FLOW-3D.Various studies for parameters such as discharging capacity, pressure distribution along the spillway profile, velocities, water surface profiles over the spillway, flow conditions, were carried out using the numerical model. The results obtained from the numerical model were compared with the results of the physical model studies. Comparison of the results from the two modeling approaches has provided a very good insight into the design process to optimize the spillway design. After studying the performance of the orifice spillway, both through physical and numerical techniques, it is found that numerical/CFD modeling can be used as a complementary tool to test the preliminary design and in the optimization phase of the spillway design prior to taking up the physical model studies.

Orifice spillway; FLOW-3D; discharging capacity; pressure profile; water surface profile

"Hydraulic design of Spillway and energy dissipator for a Run – off-the river Hydroelectric Project – comparison of Physical and Numerical model studies with a case study", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 7, page no.d193-d201, July-2022, Available :http://www.jetir.org/papers/JETIR2207322.pdf

"Hydraulic design of Spillway and energy dissipator for a Run – off-the river Hydroelectric Project – comparison of Physical and Numerical model studies with a case study", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 7, page no. ppd193-d201, July-2022, Available at : http://www.jetir.org/papers/JETIR2207322.pdf