Flow simulation in a flip bucket spillway: Dakpokei reservoir case study

Simulating the hydraulic behavior of an ogee spillway with a free jet energy dissipation form is a complex task due to the involvement of two phases: liquid (water) and gas (air). In this study, the 3D numerical model FLUENT was employed to simulate the hydraulic regime of such a spillway, specifically applied to the Dakpokei reservoir. The results indicate that the main hydraulic characteristics of the flow were successfully captured. The study also investigated the influence of surface roughness on the jet length. It was found that the jet length decreased from 50 meters to 32 meters as the roughness height increased from 0.3 mm to 5 mm. The hydraulic model was validated against experimental data, demonstrating high accuracy and confirming the reliability of the simulation approach.