Experimental Study and Numerical Simulation of Inclined Rectangular Weirs
Publication: Journal of Irrigation and Drainage Engineering
Volume 144, Issue 7
Abstract
Inclined rectangular weirs, also named pivot weirs, are used both to adjust the upstream water level and to increase the flow capacity compared with that of normal rectangular weirs. However, the experimental studies available in the literature present contradictory conclusions for the inclined weir discharge capacity. In this paper, new experimental runs and numerical simulations were performed to investigate the effect of the rectangular weir inclination angle on the stage-discharge formula. The experiments were carried out using inclination angles ranging from 30° to 90°. Buckingham’s theorem of dimensional analysis was used to obtain an equation for the flow magnification ratio (the discharge through the pivot weir divided by the corresponding discharge over the vertical weir) as a function of the weir inclination angle. The experimental observations revealed that the flow magnification ratio increases with the inclination angle to a maximum of 1.082 for 30° of inclination. Bidimensional (2D) numerical analysis using the OpenFOAM computational fluid dynamic toolbox was also used. The flow magnification ratios obtained numerically confirmed those obtained experimentally.
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Acknowledgments
The first author would like to gratefully acknowledge the assistance of Mr. Qolamreza Babaei, the hydraulic lab supervisor of the Water Engineering Department, IKIU for his efforts to construct the experimental setup.
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Information & Authors
Information
Published In
Journal of Irrigation and Drainage Engineering
Volume 144 • Issue 7 • July 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Mar 29, 2017
Accepted: Mar 5, 2018
Published online: Apr 26, 2018
Published in print: Jul 1, 2018
Discussion open until: Sep 26, 2018
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