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Article: Numerical experiment on two-dimensional line thermal

TitleNumerical experiment on two-dimensional line thermal
Authors
KeywordsAdded virtual mass
Environmental fluid mechanics
Mixing and transport
Plumes and jets
Thermals and puffs
Turbulence modeling
Vortex flow
Issue Date2002
PublisherHaiyang Chubanshe.
Citation
China Ocean Engineering, 2002, v. 16 n. 4, p. 453-467 How to Cite?
AbstractThe time evolution of a two-dimensional line thermal-a turbulent flow produced by an initial element with significant buoyancy released in a large water body, is numerically studied with the two-equation k - ε model for turbulence closure. The numerical results show that the thermal is characterized by a vortex pair flow and a kidney shaped concentration structure with double peak maxima; the computed flow details and scalar mixing characteristics can be described by self-similar relations beyond a dimensionless time around 10. There are two regions in the flow field of a line thermal: a mixing region where the concentration of tracer fluid is high and the flow is turbulent and rotational with a pair of vortex eyes, and an ambient region where the concentration is zero and the flow is potential and well-described by a model of doublet with strength very close to those given by early experimental and analytical studies. The added virtual mass coefficient of the thermal motion is found to be approximately 1. The aspect ratio for the kidney-shaped sectional thermal is found to be around 1.45 for the self-similar phase. The predicted thermal spreading and mixing rate compares well with experimental data.
Persistent Identifierhttp://hdl.handle.net/10722/71813
ISSN
2015 Impact Factor: 0.435
2015 SCImago Journal Rankings: 0.422

 

DC FieldValueLanguage
dc.contributor.authorLee, JHWen_HK
dc.contributor.authorChen, GQen_HK
dc.date.accessioned2010-09-06T06:35:24Z-
dc.date.available2010-09-06T06:35:24Z-
dc.date.issued2002en_HK
dc.identifier.citationChina Ocean Engineering, 2002, v. 16 n. 4, p. 453-467en_HK
dc.identifier.issn0890-5487en_HK
dc.identifier.urihttp://hdl.handle.net/10722/71813-
dc.description.abstractThe time evolution of a two-dimensional line thermal-a turbulent flow produced by an initial element with significant buoyancy released in a large water body, is numerically studied with the two-equation k - ε model for turbulence closure. The numerical results show that the thermal is characterized by a vortex pair flow and a kidney shaped concentration structure with double peak maxima; the computed flow details and scalar mixing characteristics can be described by self-similar relations beyond a dimensionless time around 10. There are two regions in the flow field of a line thermal: a mixing region where the concentration of tracer fluid is high and the flow is turbulent and rotational with a pair of vortex eyes, and an ambient region where the concentration is zero and the flow is potential and well-described by a model of doublet with strength very close to those given by early experimental and analytical studies. The added virtual mass coefficient of the thermal motion is found to be approximately 1. The aspect ratio for the kidney-shaped sectional thermal is found to be around 1.45 for the self-similar phase. The predicted thermal spreading and mixing rate compares well with experimental data.en_HK
dc.languageengen_HK
dc.publisherHaiyang Chubanshe.en_HK
dc.relation.ispartofChina Ocean Engineeringen_HK
dc.subjectAdded virtual massen_HK
dc.subjectEnvironmental fluid mechanicsen_HK
dc.subjectMixing and transporten_HK
dc.subjectPlumes and jetsen_HK
dc.subjectThermals and puffsen_HK
dc.subjectTurbulence modelingen_HK
dc.subjectVortex flowen_HK
dc.titleNumerical experiment on two-dimensional line thermalen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0890-5487&volume=16&issue=4&spage=453&epage=467&date=2002&atitle=Numerical+experiment+on+two-dimensional+line+thermalen_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-s2.0-0036921797en_HK
dc.identifier.hkuros82371en_HK
dc.identifier.volume16en_HK
dc.identifier.issue4en_HK
dc.identifier.spage453en_HK
dc.identifier.epage467en_HK
dc.publisher.placeChinaen_HK
dc.identifier.scopusauthoridLee, JHW=36078318900en_HK
dc.identifier.scopusauthoridChen, GQ=7406541589en_HK

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