Authors : Uday A.M. Alturfi, Hayder Mohammed Jasim AL-Moadhen and Hayder Sami Mohammed
Abstract: Computational Fluid Dynamics (CFD) modelling in field of hydraulic structures and river engineering is continuously growing in recent years, through applied this powerful tool for modeling several types of multiphase flow. The objective of current study, it is to extends clear understanding of multiphase flow around stepped spillway for different steps configuration and to test the capabilities of the CFD Model (Fluent 18.2) to represent these phenomena. VOF method adopted to capture interface between water and air, k-ε turbulent model for turbulence parameters and (PISO) Pressure Implicit with Splitting of Operator algorithm is used. Experimental study is carried out for four model configuration according to the steps aspect ratio Hs/Ls (1, 0.75, 0.6 and 0.5) for flow rate range (10, 15 and 20 L sec–1). physical model made from plywood with smooth surface. CFD Model demonstrated an acceptably recorded result in predicting the energy dissipation rate for different steps configuration compering with the experimental results. Also, it is obtained that the energy dissipation rate is increases with increase the steps aspect ratio. time steps size it about 0.005 sec or less are recommend to capture the flow pattern and secondary flow around stepped spillway.
Uday A.M. Alturfi, Hayder Mohammed Jasim AL-Moadhen and Hayder Sami Mohammed, 2020. Evaluation of Computational Fluid Dynamic Model in Investigating the Hydraulic Performance of Stepped Spillway. Journal of Engineering and Applied Sciences, 15: 752-761.