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Article: Study on the wind field and pollutant dispersion in street canyons using a stable numerical method

TitleStudy on the wind field and pollutant dispersion in street canyons using a stable numerical method
Authors
Issue Date2005
PublisherI O S Press. The Journal's web site is located at http://www.iospress.nl/html/10010742.php
Citation
Journal Of Environmental Sciences, 2005, v. 17 n. 3, p. 488-490 How to Cite?
AbstractA stable finite element method for the time dependent Navier-Stokes equations was used for studying the wind flow and pollutant dispersion within street canyons. A three-step fractional method was used to solve the velocity field and the pressure field separately from the governing equations. The Streamline Upwind Petrov-Galerkin (SUPG) method was used to get stable numerical results. Numerical oscillation was minimized and satisfactory results can be obtained for flows at high Reynolds numbers. Simulating the flow over a square cylinder within a wide range of Reynolds numbers validates the wind field model. The Strouhal numbers obtained from the numerical simulation had a good agreement with those obtained from experiment. The wind field model developed in the present study is applied to simulate more complex flow phenomena in street canyons with two different building configurations. The results indicated that the flow at rooftop of buildings might not be assumed parallel to the ground as some numerical modelers did. A counter-clockwise rotating vortex may be found in street canyons with an inflow from the left to right. In addition, increasing building height can increase velocity fluctuations in the street canyon under certain circumstances, which facilitate pollutant dispersion. At high Reynolds numbers, the flow regimes in street canyons do not change with inflow velocity. © 2005 Science Press. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/76093
ISSN
2015 Impact Factor: 2.208
2015 SCImago Journal Rankings: 0.832
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorXia, JYen_HK
dc.contributor.authorLeung, DYCen_HK
dc.date.accessioned2010-09-06T07:17:34Z-
dc.date.available2010-09-06T07:17:34Z-
dc.date.issued2005en_HK
dc.identifier.citationJournal Of Environmental Sciences, 2005, v. 17 n. 3, p. 488-490en_HK
dc.identifier.issn1001-0742en_HK
dc.identifier.urihttp://hdl.handle.net/10722/76093-
dc.description.abstractA stable finite element method for the time dependent Navier-Stokes equations was used for studying the wind flow and pollutant dispersion within street canyons. A three-step fractional method was used to solve the velocity field and the pressure field separately from the governing equations. The Streamline Upwind Petrov-Galerkin (SUPG) method was used to get stable numerical results. Numerical oscillation was minimized and satisfactory results can be obtained for flows at high Reynolds numbers. Simulating the flow over a square cylinder within a wide range of Reynolds numbers validates the wind field model. The Strouhal numbers obtained from the numerical simulation had a good agreement with those obtained from experiment. The wind field model developed in the present study is applied to simulate more complex flow phenomena in street canyons with two different building configurations. The results indicated that the flow at rooftop of buildings might not be assumed parallel to the ground as some numerical modelers did. A counter-clockwise rotating vortex may be found in street canyons with an inflow from the left to right. In addition, increasing building height can increase velocity fluctuations in the street canyon under certain circumstances, which facilitate pollutant dispersion. At high Reynolds numbers, the flow regimes in street canyons do not change with inflow velocity. © 2005 Science Press. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherI O S Press. The Journal's web site is located at http://www.iospress.nl/html/10010742.phpen_HK
dc.relation.ispartofJournal of Environmental Sciencesen_HK
dc.rightsJournal of Environmental Sciences. Copyright © I O S Press.en_HK
dc.subject.meshAir Pollutants - analysisen_HK
dc.subject.meshCitiesen_HK
dc.subject.meshModels, Theoreticalen_HK
dc.subject.meshTime Factorsen_HK
dc.subject.meshWinden_HK
dc.titleStudy on the wind field and pollutant dispersion in street canyons using a stable numerical methoden_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1001-0742&volume=17&issue=3&spage=488&epage=490&date=2005&atitle=Study+on+the+wind+field+and+pollutant+dispersion+in+street+canyons+using+a+stable+numerical+methoden_HK
dc.identifier.emailLeung, DYC:ycleung@hku.hken_HK
dc.identifier.authorityLeung, DYC=rp00149en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.pmid16083131-
dc.identifier.scopuseid_2-s2.0-23944456153en_HK
dc.identifier.hkuros98486en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-23944456153&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume17en_HK
dc.identifier.issue3en_HK
dc.identifier.spage488en_HK
dc.identifier.epage490en_HK
dc.identifier.isiWOS:000229189900030-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridXia, JY=7402327322en_HK
dc.identifier.scopusauthoridLeung, DYC=7203002484en_HK

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