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http://dx.doi.org/10.11001/jksww.2016.30.2.147

Analysis of Overflow Characteristics around a Circular-Crested Weir by Using Numerical Model  

Kim, Dae-Geun (Department of Civil Engineering, College of Engineering, Mokpo National University)
Publication Information
Journal of Korean Society of Water and Wastewater / v.30, no.2, 2016 , pp. 147-154 More about this Journal
Abstract
The present study used the hydrodynamic numerical model, with the Reynolds-averaged Navier-Stokes equations (RANS) as its governing equations, to analyze overflow characteristics such as the discharge coefficient of circular-crested weir and the flow velocity and pressure distribution of weir crest. The simulation results well reproduced the overflow characteristics of the overfall of circular-crested weir both qualitatively and quantitatively. As for the discharge coefficient, rational results were yielded by the discharge coefficient equation proposed by Hager(1985) in the $H_1/R_b<0.58$ and by the discharge coefficient equation proposed by Samani and Bagheri(2014) in the $H_1/R_b>0.58$, respectively. Because most existing discharge coefficient equations were developed by disregarding the effects of the approach velocity, when they are applied, it is necessary to evaluate the effects of the approach velocity on the overflow head beforehand.
Keywords
circular-crested weir; discharge coefficient; overflow head; RANS; weir crest;
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Times Cited By KSCI : 4  (Citation Analysis)
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