Numerical analysis of free flow past a sluice gate
 DaeGeun Kim Major in Civil Engrg.
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Sluice gates are widely used for flow control in open channels. This study shows that numerical tools using the Reynolds averaging NavierStokes equations are sufficiently advanced to calculate the contraction and the discharge coefficients, and the pressure distribution for free flow past a sluice gate. The trend of the existing inviscid theoretical contraction coefficient is quitedifferent from existing experiments. As the gate opening rate increases, the contraction coefficient for the present study gradually decreases if the gate opening rate is less than 0.4 and increases when the gate opening rate is larger than 0.4, exhibiting a tendency similar to existing experimental data. This is because energy losses by friction and water surface oscillations increase as the approach velocity from the gate increases as the gate opening rate is larger than 0.4. The discharge coefficients and the pressure distributions from the present analysis correspond closely to the existing experimental data. In this study, by performing a numerical analysis that does not use the assumptions adopted in the existing potential flow theory, the contraction coefficient, the discharge coefficient, and the pressure distributions were thoroughly analyzed. This study shows that existing numerical models using RANS are a useful tool in the design of hydraulic structures.
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 Title
 Numerical analysis of free flow past a sluice gate
 Journal

KSCE Journal of Civil Engineering
Volume 11, Issue 2 , pp 127132
 Cover Date
 20070301
 DOI
 10.1007/BF02823856
 Print ISSN
 12267988
 Online ISSN
 19763808
 Publisher
 Korean Society of Civil Engineers
 Additional Links
 Topics
 Keywords

 contraction coefficient
 discharge coefficient
 RANS
 sluice gate
 Industry Sectors
 Authors
 Author Affiliations

 1. Division of Construction Engrg., Mokpo National Univ., MuanGun, 534729, Chonnam, Kor