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Article: Numerical study on plume interaction above an alternating diffuser in stagnant water

TitleNumerical study on plume interaction above an alternating diffuser in stagnant water
Authors
KeywordsAlternating diffuser
Computational fluid dynamics
Densimetric Froude number
Environmental hydraulics
K-ε
Low pressure cavity
Merging point
Model
Plume interaction
Turbulence modelling
Issue Date2006
PublisherHaiyang Chubanshe.
Citation
China Ocean Engineering, 2006, v. 20 n. 2, p. 289-302 How to Cite?
AbstractThe plume interaction above an alternating diffuser in stagnant water is studied with 3D Reynolds-averaged Navier-Stokes equations (RANS) combined with a buoyancy-extended k-ε model. The steady three-dimensional turbulent flow and temperature fields are computed by use of the finite volume method on a non-uniform high resolution orthogonal grid. The numerical predictions demonstrate a generic flow pattern for different turbulent heated jet discharges: the buoyant jets on each side of the diffuser first merge to form an essentially two-dimensional plume which bends back toward the diffuser centerline due to a low pressure cavity. In general, an under-pressure exists in the cavity until the plumes merge; the pressure increases to slightly positive afterwards. Two-dimensionality of the scalar and flow field is attained much later than the point of zero pressure. The position of merging point is governed by mainly four parameters - the discharge densimetric Froude number, the port diameter and space, and the horizontal distance between alternating jet nozzles. A formula from numerical simulations is obtained through regression analysis and it is used to predict the position of plume merging point. The predicted temperature fields are comparable to previous experiments.
Persistent Identifierhttp://hdl.handle.net/10722/70735
ISSN
2015 Impact Factor: 0.435
2015 SCImago Journal Rankings: 0.422

 

DC FieldValueLanguage
dc.contributor.authorKuang, CPen_HK
dc.contributor.authorLee, JHWen_HK
dc.contributor.authorLiu, SGen_HK
dc.contributor.authorGu, Jen_HK
dc.date.accessioned2010-09-06T06:25:39Z-
dc.date.available2010-09-06T06:25:39Z-
dc.date.issued2006en_HK
dc.identifier.citationChina Ocean Engineering, 2006, v. 20 n. 2, p. 289-302en_HK
dc.identifier.issn0890-5487en_HK
dc.identifier.urihttp://hdl.handle.net/10722/70735-
dc.description.abstractThe plume interaction above an alternating diffuser in stagnant water is studied with 3D Reynolds-averaged Navier-Stokes equations (RANS) combined with a buoyancy-extended k-ε model. The steady three-dimensional turbulent flow and temperature fields are computed by use of the finite volume method on a non-uniform high resolution orthogonal grid. The numerical predictions demonstrate a generic flow pattern for different turbulent heated jet discharges: the buoyant jets on each side of the diffuser first merge to form an essentially two-dimensional plume which bends back toward the diffuser centerline due to a low pressure cavity. In general, an under-pressure exists in the cavity until the plumes merge; the pressure increases to slightly positive afterwards. Two-dimensionality of the scalar and flow field is attained much later than the point of zero pressure. The position of merging point is governed by mainly four parameters - the discharge densimetric Froude number, the port diameter and space, and the horizontal distance between alternating jet nozzles. A formula from numerical simulations is obtained through regression analysis and it is used to predict the position of plume merging point. The predicted temperature fields are comparable to previous experiments.en_HK
dc.languageengen_HK
dc.publisherHaiyang Chubanshe.en_HK
dc.relation.ispartofChina Ocean Engineeringen_HK
dc.subjectAlternating diffuseren_HK
dc.subjectComputational fluid dynamicsen_HK
dc.subjectDensimetric Froude numberen_HK
dc.subjectEnvironmental hydraulicsen_HK
dc.subjectK-εen_HK
dc.subjectLow pressure cavityen_HK
dc.subjectMerging pointen_HK
dc.subjectModelen_HK
dc.subjectPlume interactionen_HK
dc.subjectTurbulence modellingen_HK
dc.titleNumerical study on plume interaction above an alternating diffuser in stagnant wateren_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0890-5487&volume=20&issue=2&spage=289&epage=302&date=2006&atitle=Numerical+study+on+plume+interaction+above+an+alternating+diffuser+in+stagnant+wateren_HK
dc.identifier.emailLee, JHW: hreclhw@hku.hken_HK
dc.identifier.authorityLee, JHW=rp00061en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-33747502467en_HK
dc.identifier.hkuros125907en_HK
dc.identifier.volume20en_HK
dc.identifier.issue2en_HK
dc.identifier.spage289en_HK
dc.identifier.epage302en_HK
dc.publisher.placeChinaen_HK
dc.identifier.scopusauthoridKuang, CP=35819452600en_HK
dc.identifier.scopusauthoridLee, JHW=36078318900en_HK
dc.identifier.scopusauthoridLiu, SG=26643132100en_HK
dc.identifier.scopusauthoridGu, J=55308229600en_HK

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