Numerical study of energy dissipation and block barriers in stepped spillways

In this research, the accuracy of the Flow-3D numerical model in the flow simulation in a stepped spillway was probed using data obtained from the physical model. In addition, the effects of block barriers on the energy dissipation rate were investigated. To adopt a proper turbulent model, Renormali...

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Autores principales:	Mehdi Karami Moghadam, Ata Amini, Ehsan Karami Moghadam
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	energy dissipation nappe flow skimming flow stepped spillway Information technology T58.5-58.64 Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/ae168eafe5684f5f9404d02e2261c33c
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spelling	oai:doaj.org-article:ae168eafe5684f5f9404d02e2261c33c2021-11-05T17:42:54ZNumerical study of energy dissipation and block barriers in stepped spillways1464-71411465-173410.2166/hydro.2020.245https://doaj.org/article/ae168eafe5684f5f9404d02e2261c33c2021-03-01T00:00:00Zhttp://jh.iwaponline.com/content/23/2/284https://doaj.org/toc/1464-7141https://doaj.org/toc/1465-1734In this research, the accuracy of the Flow-3D numerical model in the flow simulation in a stepped spillway was probed using data obtained from the physical model. In addition, the effects of block barriers on the energy dissipation rate were investigated. To adopt a proper turbulent model, Renormalization Group k-ε, RNG k-ε, and standard k-ε models were employed. Then, the Flow-3D was run in five discharges for nine spillways with the ratios of block length to step length (Lb/l) and block height to step height (Hb/h) as 0.3, 0.4, and 0.5. The results indicated that both turbulent models had almost similar outcomes though the run time of the RNG k-ε model was shorter. The blocks with a shorter length in low ratios of Hb/h and the lengthier blocks in high ratios of Hb/h undergo more relative energy dissipation relative to the no-block situation. For Hb/h = 0.3 and Lb/l equal to 0.3, 0.4, and 0.5, the relative energy dissipation climbed on average as 8.5, 6.5, and 4.5% respectively, compared with the no-block case. The most influence exerted on relative energy dissipation was obtained via the blocks with Hb/h = Lb/l equal to 0.3 and 0.5 with respective increases of 8.6 and 8.4%. HIGHLIGHTS The Flow-3D model applied to examine the effects of height and length of the block on the energy dissipation.; As the discharge increases, the energy dissipation decreases and the effects of blocks increases.; Shorter blocks at lower elevations and longer blocks at higher length had the highest energy dissipation.; The blocks with length/height equal to 0.3 and 0.5 were assigned the most increase in energy dissipation.;Mehdi Karami MoghadamAta AminiEhsan Karami MoghadamIWA Publishingarticleenergy dissipationnappe flowskimming flowstepped spillwayInformation technologyT58.5-58.64Environmental technology. Sanitary engineeringTD1-1066ENJournal of Hydroinformatics, Vol 23, Iss 2, Pp 284-297 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	energy dissipation nappe flow skimming flow stepped spillway Information technology T58.5-58.64 Environmental technology. Sanitary engineering TD1-1066
spellingShingle	energy dissipation nappe flow skimming flow stepped spillway Information technology T58.5-58.64 Environmental technology. Sanitary engineering TD1-1066 Mehdi Karami Moghadam Ata Amini Ehsan Karami Moghadam Numerical study of energy dissipation and block barriers in stepped spillways
description	In this research, the accuracy of the Flow-3D numerical model in the flow simulation in a stepped spillway was probed using data obtained from the physical model. In addition, the effects of block barriers on the energy dissipation rate were investigated. To adopt a proper turbulent model, Renormalization Group k-ε, RNG k-ε, and standard k-ε models were employed. Then, the Flow-3D was run in five discharges for nine spillways with the ratios of block length to step length (Lb/l) and block height to step height (Hb/h) as 0.3, 0.4, and 0.5. The results indicated that both turbulent models had almost similar outcomes though the run time of the RNG k-ε model was shorter. The blocks with a shorter length in low ratios of Hb/h and the lengthier blocks in high ratios of Hb/h undergo more relative energy dissipation relative to the no-block situation. For Hb/h = 0.3 and Lb/l equal to 0.3, 0.4, and 0.5, the relative energy dissipation climbed on average as 8.5, 6.5, and 4.5% respectively, compared with the no-block case. The most influence exerted on relative energy dissipation was obtained via the blocks with Hb/h = Lb/l equal to 0.3 and 0.5 with respective increases of 8.6 and 8.4%. HIGHLIGHTS The Flow-3D model applied to examine the effects of height and length of the block on the energy dissipation.; As the discharge increases, the energy dissipation decreases and the effects of blocks increases.; Shorter blocks at lower elevations and longer blocks at higher length had the highest energy dissipation.; The blocks with length/height equal to 0.3 and 0.5 were assigned the most increase in energy dissipation.;
format	article
author	Mehdi Karami Moghadam Ata Amini Ehsan Karami Moghadam
author_facet	Mehdi Karami Moghadam Ata Amini Ehsan Karami Moghadam
author_sort	Mehdi Karami Moghadam
title	Numerical study of energy dissipation and block barriers in stepped spillways
title_short	Numerical study of energy dissipation and block barriers in stepped spillways
title_full	Numerical study of energy dissipation and block barriers in stepped spillways
title_fullStr	Numerical study of energy dissipation and block barriers in stepped spillways
title_full_unstemmed	Numerical study of energy dissipation and block barriers in stepped spillways
title_sort	numerical study of energy dissipation and block barriers in stepped spillways
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/ae168eafe5684f5f9404d02e2261c33c
work_keys_str_mv	AT mehdikaramimoghadam numericalstudyofenergydissipationandblockbarriersinsteppedspillways AT ataamini numericalstudyofenergydissipationandblockbarriersinsteppedspillways AT ehsankaramimoghadam numericalstudyofenergydissipationandblockbarriersinsteppedspillways
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Numerical study of energy dissipation and block barriers in stepped spillways

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