CFD analysis of flow over ogee spillway with varying upstream face slope

Abstract

Abstract Spillway design plays a vital role in the management of water resources. Because of its high hydraulic performance and ability to transmit flows safely and efficiently when designed, the Ogee spillway has been a major research project. The spillway must carry more flow than intended if the predicted maximum flood has risen. The present study examines a spillway model with different slopes on the upstream face through commonly used spillway designs from the Waterways Experimental Station (WES). The investigation is performed with computational fluid dynamics (CFD) modeling employing ANSYS-Fluent. An analysis was conducted to examine the distribution of pressure throughout the spillway, taking into account variations in the spillway’s shape and the height of the water over the top. Furthermore, the impact of the inverse curve on the distribution of pressure around the toe was investigated. The flow simulation included RNG k- ε turbulence and Volume of Fluid (VOF) models, including the interaction between water and air. The presence of an inclined upstream face with a 1:3 slope at the design head resulted in a 10.03 percent decrease in pressure at the crest. Similarly, the inclusion of an inclined upstream face with a 2:3 slope led to a 32.75 percent reduction in pressure at the crest. Using an inverse curve at the downstream toe consistently led to a reduction in pressure at the toe region in all instances.