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Article: Characteristics of air exchange in a street canyon with ground heating

TitleCharacteristics of air exchange in a street canyon with ground heating
Authors
KeywordsAir exchange rate (AER)
Computational fluid dynamic (CFD) modeling
Ground-level heating
k-ε turbulence models
Issue Date2006
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/atmosenv
Citation
Atmospheric Environment, 2006, v. 40 n. 33, p. 6396-6409 How to Cite?
AbstractThis paper investigates the effects of solar radiation (in the form of ground-level heating) on the air exchange rate (AER) of an idealized street canyon using computational fluid dynamic (CFD) technique. A two-dimensional numerical model based on Reynolds-averaged Navier-Stokes equations equipped with the standard, Renormalization Group (RNG), and realizable k-ε turbulence models was developed using the commercial CFD code FLUENT. The newly developed numerical model was validated by published wind tunnel results with buoyancy force. It was found that different k-ε turbulence models yielded comparable simulation results. The sensitivity tests based on a street canyon of unity aspect ratio showed that the existence of buoyancy force markedly affected its airflow structure and AER, particularly under calm wind condition. The AER induced by vertical velocity fluctuation AER w″ is larger than that induced by mean vertical velocity AER w. Their difference decreased with increasing the dimensionless parameter Gr/Re 2. The functional relationship between total AER and Gr/Re 2 could be expressed in the form of a second-order polynomial. © 2006 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/75919
ISSN
2015 Impact Factor: 3.459
2015 SCImago Journal Rankings: 1.999
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorXie, Xen_HK
dc.contributor.authorLiu, CHen_HK
dc.contributor.authorLeung, DYCen_HK
dc.contributor.authorLeung, MKHen_HK
dc.date.accessioned2010-09-06T07:15:50Z-
dc.date.available2010-09-06T07:15:50Z-
dc.date.issued2006en_HK
dc.identifier.citationAtmospheric Environment, 2006, v. 40 n. 33, p. 6396-6409en_HK
dc.identifier.issn1352-2310en_HK
dc.identifier.urihttp://hdl.handle.net/10722/75919-
dc.description.abstractThis paper investigates the effects of solar radiation (in the form of ground-level heating) on the air exchange rate (AER) of an idealized street canyon using computational fluid dynamic (CFD) technique. A two-dimensional numerical model based on Reynolds-averaged Navier-Stokes equations equipped with the standard, Renormalization Group (RNG), and realizable k-ε turbulence models was developed using the commercial CFD code FLUENT. The newly developed numerical model was validated by published wind tunnel results with buoyancy force. It was found that different k-ε turbulence models yielded comparable simulation results. The sensitivity tests based on a street canyon of unity aspect ratio showed that the existence of buoyancy force markedly affected its airflow structure and AER, particularly under calm wind condition. The AER induced by vertical velocity fluctuation AER w″ is larger than that induced by mean vertical velocity AER w. Their difference decreased with increasing the dimensionless parameter Gr/Re 2. The functional relationship between total AER and Gr/Re 2 could be expressed in the form of a second-order polynomial. © 2006 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/atmosenven_HK
dc.relation.ispartofAtmospheric Environmenten_HK
dc.subjectAir exchange rate (AER)en_HK
dc.subjectComputational fluid dynamic (CFD) modelingen_HK
dc.subjectGround-level heatingen_HK
dc.subjectk-ε turbulence modelsen_HK
dc.titleCharacteristics of air exchange in a street canyon with ground heatingen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1352-2310&volume=40&spage=6396&epage=6409&date=2006&atitle=Characteristics+of+air+exchange+in+a+street+canyon+with+ground+heatingen_HK
dc.identifier.emailLiu, CH: chliu@hkucc.hku.hken_HK
dc.identifier.emailLeung, DYC: ycleung@hku.hken_HK
dc.identifier.emailLeung, MKH:en_HK
dc.identifier.authorityLiu, CH=rp00152en_HK
dc.identifier.authorityLeung, DYC=rp00149en_HK
dc.identifier.authorityLeung, MKH=rp00148en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.atmosenv.2006.05.050en_HK
dc.identifier.scopuseid_2-s2.0-33748861319en_HK
dc.identifier.hkuros129406en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33748861319&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume40en_HK
dc.identifier.issue33en_HK
dc.identifier.spage6396en_HK
dc.identifier.epage6409en_HK
dc.identifier.isiWOS:000241095900011-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridXie, X=8704824500en_HK
dc.identifier.scopusauthoridLiu, CH=36065161300en_HK
dc.identifier.scopusauthoridLeung, DYC=7203002484en_HK
dc.identifier.scopusauthoridLeung, MKH=8862966600en_HK

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