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On the Effect of Block Roughness in Ogee Spillways with Flip Buckets

1
Department of Civil Engineering, Faculty of Engineering, University of Maragheh, Maragheh 8311155181, Iran
2
Department of Civil Engineering, Faculty of Engineering, University of Zanjan, Zanjan 4537138791, Iran
3
Department of Civil Engineering, University of Calabria, 87036 Arcavacata, Italy
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Department of Civil Engineering, Faculty of Engineering, Razi University of Kermanshah, Kermanshah 6714414971, Iran
5
Department of Engineering, Engineering Faculty, Niccolò Cusano University, 00166 Rome, Italy
*
Author to whom correspondence should be addressed.
Fluids 2020, 5(4), 182; https://doi.org/10.3390/fluids5040182
Received: 10 September 2020 / Revised: 11 October 2020 / Accepted: 14 October 2020 / Published: 16 October 2020
In this study, the effect of the presence of bed-block roughness in an ogee spillway on energy dissipation and jet length is investigated. A series of experimental and numerical tests were conducted using an ogee spillway with block roughness on the bed without a flip bucket and with a flip bucket at different take-off angles (32 °C and 52 °C). To model the free-flow surface, the volume-of-fluid (VOF) method and turbulence model from RNG k–ε were used. Results indicated that the numerical model is fairly capable of simulating a free-flow surface over an ogee spillway; using block roughness on the spillway chute without a bucket, relative energy dissipation increased by 15.4% compared to that in the spillway with a smooth bed, while for the spillway with 32 °C and 52 °C buckets, it increased by 9.5%. The jet length for a spillway with a flip bucket and roughened bed decreased by 8% to 58% compared to that in a smooth bed. Lastly, the relationships for the estimation of relative energy dissipation and jet length are presented. View Full-Text
Keywords: bed roughness; physical and numerical model; ogee spillway; energy dissipation; jet length bed roughness; physical and numerical model; ogee spillway; energy dissipation; jet length
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MDPI and ACS Style

Daneshfaraz, R.; Ghaderi, A.; Akhtari, A.; Di Francesco, S. On the Effect of Block Roughness in Ogee Spillways with Flip Buckets. Fluids 2020, 5, 182. https://doi.org/10.3390/fluids5040182

AMA Style

Daneshfaraz R, Ghaderi A, Akhtari A, Di Francesco S. On the Effect of Block Roughness in Ogee Spillways with Flip Buckets. Fluids. 2020; 5(4):182. https://doi.org/10.3390/fluids5040182

Chicago/Turabian Style

Daneshfaraz, Rasoul, Amir Ghaderi, Aliakbar Akhtari, and Silvia Di Francesco. 2020. "On the Effect of Block Roughness in Ogee Spillways with Flip Buckets" Fluids 5, no. 4: 182. https://doi.org/10.3390/fluids5040182

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