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Article: Large-Eddy simulation of flow and scalar transport in a modeled street canyon

TitleLarge-Eddy simulation of flow and scalar transport in a modeled street canyon
Authors
Issue Date2002
PublisherAmerican Meteorological Society. The Journal's web site is located at http://www.ametsoc.org/ams
Citation
Journal Of Applied Meteorology, 2002, v. 41 n. 6, p. 660-673 How to Cite?
AbstractThis study uses large-eddy simulation (LES) to illustrate the flow and turbulence structure and to investigate the mechanism of passive scalar transport in a street canyon. Calculations for a modeled street canyon with building-height-to-street-width ratio of unity at Reynolds number equal to 12 000 are conducted. When the approaching wind is perpendicular to the street axis, the calculation produces a primary vortex in the street canyon, similar to previous studies. An evaluation of the LES results with wind-tunnel measurements reveals good agreement for both mean and turbulence parameters of the flow and scalar fields. The computed primary vortex is confined to the street canyon and is isolated from the free stream flow such that the removal of a scalar emitted at the street level is accomplished by turbulent diffusion at the roof level. It is determined from the calculations that very little scalar is removed from the street canyon, and 97% of the scalar is retained. The scalar mixing at the roof level occurs primarily on the leeward side of the street canyon. In addition to the primary vortex, three secondary vortices are located in the corners of the street canyon at which scalar mixing is enhanced. An examination of additional simulations shows how the location of the scalar source affects the distribution of the scalar.
Persistent Identifierhttp://hdl.handle.net/10722/156635
ISSN
2005 Impact Factor: 1.702
References

 

DC FieldValueLanguage
dc.contributor.authorLiu, CHen_US
dc.contributor.authorBarth, MCen_US
dc.date.accessioned2012-08-08T08:43:18Z-
dc.date.available2012-08-08T08:43:18Z-
dc.date.issued2002en_US
dc.identifier.citationJournal Of Applied Meteorology, 2002, v. 41 n. 6, p. 660-673en_US
dc.identifier.issn0894-8763en_US
dc.identifier.urihttp://hdl.handle.net/10722/156635-
dc.description.abstractThis study uses large-eddy simulation (LES) to illustrate the flow and turbulence structure and to investigate the mechanism of passive scalar transport in a street canyon. Calculations for a modeled street canyon with building-height-to-street-width ratio of unity at Reynolds number equal to 12 000 are conducted. When the approaching wind is perpendicular to the street axis, the calculation produces a primary vortex in the street canyon, similar to previous studies. An evaluation of the LES results with wind-tunnel measurements reveals good agreement for both mean and turbulence parameters of the flow and scalar fields. The computed primary vortex is confined to the street canyon and is isolated from the free stream flow such that the removal of a scalar emitted at the street level is accomplished by turbulent diffusion at the roof level. It is determined from the calculations that very little scalar is removed from the street canyon, and 97% of the scalar is retained. The scalar mixing at the roof level occurs primarily on the leeward side of the street canyon. In addition to the primary vortex, three secondary vortices are located in the corners of the street canyon at which scalar mixing is enhanced. An examination of additional simulations shows how the location of the scalar source affects the distribution of the scalar.en_US
dc.languageengen_US
dc.publisherAmerican Meteorological Society. The Journal's web site is located at http://www.ametsoc.org/amsen_US
dc.relation.ispartofJournal of Applied Meteorologyen_US
dc.titleLarge-Eddy simulation of flow and scalar transport in a modeled street canyonen_US
dc.typeArticleen_US
dc.identifier.emailLiu, CH:chliu@hkucc.hku.hken_US
dc.identifier.authorityLiu, CH=rp00152en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-0036601731en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0036601731&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume41en_US
dc.identifier.issue6en_US
dc.identifier.spage660en_US
dc.identifier.epage673en_US
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridLiu, CH=36065161300en_US
dc.identifier.scopusauthoridBarth, MC=7102913661en_US

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