Experimental and 3-D Numerical Simulation of Flow over a Rectangular Broad- Crested Weir
Hossein Afshar1, Seyed Hooman Hoseini2
1Hossein Afshar, Mechanical Engineering Department, Islamic Azad University, East Tehran Branch, Tehran, Iran.
2Seyed Hooman Hoseini, Department of Water Engineering, Islamic Azad University, Central Tehran Branch, Iran.
Manuscript received on July 22, 2013. | Revised Manuscript received on August 09, 2013. | Manuscript published on August 30, 2013. | PP: 214-219  | Volume-2, Issue-6, August 2013.  | Retrieval Number: F2036082613/2013©BEIESP

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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: A broad-crested weir is a flat-crested structure with alarge crest length compared to the flow thickness which is widely used in open channels, rivers, irrigation and drainage systems. New experiments were conducted on a rectangular broad-crested weir with a rounded corner. In this study, Computational Fluid Dynamics (CFD) model together with laboratory model were used in order to determining the free-surface profile of rectangular broad-crested weir. Simulations were performed using the volume of fluid (VOF) free surface model and three turbulence models of the RNG k–ε, standard k–ε and the large eddy simulation (LES) to find the water level profile and streamlines. The structured mesh with high concentration near the solid regions was used in te numerical procedure. The computational results showed a close agreement with experimental data obtained in the laboratory. Also, results indicate that RNG model has the minimum level.
Keywords: Broad-crested weir, CFD, Laboratory model, Free surface profile.