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Contraction and Discharge Coefficient of Free Flow Past a Sluice Gate

Author(s): Dae Geun Kim

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Keywords: Sluice gate; RANS; Contraction coefficient; Discharge coefficient

Abstract: Sluice gates are widely used for flow control in open channels. This study shows that for a free flow past a sluice gate numerical tools using the Reynolds averaging Navier-Stokes equations are sufficiently advanced to calculate the contraction and discharge coefficient. The trend of the existing inviscid theoretical contraction coefficient is quite different from the existing experimental ones. The contraction coefficient for the present study gradually decreases in the range of Ea 1 4. 0 with increasing 1Ea, exhibiting a tendency similar to existing experiment data. This is because energy loss by friction and water surface oscillation increases as the approach velocity head at the upstream of the gate increases when 1Ea is higher than 0. 4. The discharge coefficients from the present analysis also correspond closely with the existing experimental data. In this study, by performing a numerical analysis that does not use the assumptions adopted in existing potential flow theory, the contraction coefficient (which existing studies could not obtain correctly) and discharge coefficient could be thoroughly analyzed. This study shows that existing numerical models using RANS can be a useful tool in the design and research of hydraulic structures.

DOI:

Year: 2005

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