Uday A.M. Alturfi, Hayder Mohammed Jasim AL-Moadhen, Hayder Sami Mohammed,
Evaluation of Computational Fluid Dynamic Model in Investigating the
Hydraulic Performance of Stepped Spillway,
Journal of Engineering and Applied Sciences,
Volume 15,Issue 3,
2020,
Pages 752-761,
ISSN 1816-949x,
jeasci.2020.752.761,
(https://makhillpublications.co/view-article.php?doi=jeasci.2020.752.761)
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 sec1). 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.
Keywords: CFD;VOF Model;multiphase flow;stepped spillway;turbulence k-ε;physical modeling;energy
dissipation rate;turbulence kinematic energy