Experimental and Numerical Investigation of Flow Over Ogee Spillway

Abstract

Ogee type spillway is one of the most preferred sluice types due to its functional suitability and high safety factor. It is used for controlling the flow rates and water levels in reservoirs, such as lowering the water level in emergency situations, maintaining normal river functions and discharging excess water. The main aim of this study is to investigate the flow over ogee type spillway by performing experiments in an open channel flume in the laboratory and simulating with numerical model. The numerical model having the same dimensions with the physical model is modeled with two different programs of ANSYS-Fluent and OpenFOAM. The flow depths of the models were measured at four points, H-1, H-2, H-3, H-4. In the numerical analysis, two different turbulence models, K-epsilon and K-omega SST turbulence model were used in order to investigate the accuracy of the turbulence models in the open channel. According to the results, R(2)values, obtained from ANSYS- Fluent for the each measurement points where H-1, H-2, H-3, H-4, are 0.9776, 0.9859, 0.9701, 0.9916 and obtained from OpenFOAM for the each measurement points 0.9920, 0.9687, 0.9855, 0.9926 respectively. The findings show that the numerical tools have been sufficiently developed to simulate flow depths and water surface profiles.