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Article: Large-Eddy Simulation of Flow and Pollutant Transport in Urban Street Canyons with Ground Heating

TitleLarge-Eddy Simulation of Flow and Pollutant Transport in Urban Street Canyons with Ground Heating
Authors
KeywordsGround heating
Large-eddy simulation
Pollutant dispersion
Unstable stratification
Urban street canyon
Issue Date2010
PublisherSpringer Verlag Dordrecht. The Journal's web site is located at http://springerlink.metapress.com/openurl.asp?genre=journal&issn=0006-8314
Citation
Boundary-Layer Meteorology, 2010, v. 137 n. 2, p. 187-204 How to Cite?
AbstractOur study employed large-eddy simulation (LES) based on a one-equation subgrid-scale model to investigate the flow field and pollutant dispersion characteristics inside urban street canyons. Unstable thermal stratification was produced by heating the ground of the street canyon. Using the Boussinesq approximation, thermal buoyancy forces were taken into account in both the Navier-Stokes equations and the transport equation for subgrid-scale turbulent kinetic energy (TKE). The LESs were validated against experimental data obtained in wind-tunnel studies before the model was applied to study the detailed turbulence, temperature, and pollutant dispersion characteristics in the street canyon of aspect ratio 1. The effects of different Richardson numbers (Ri) were investigated. The ground heating significantly enhanced mean flow, turbulence, and pollutant flux inside the street canyon, but weakened the shear at the roof level. The mean flow was observed to be no longer isolated from the free stream and fresh air could be entrained into the street canyon at the roof-level leeward corner. Weighed against higher temperature, the ground heating facilitated pollutant removal from the street canyon. © 2010 The Author(s).
Persistent Identifierhttp://hdl.handle.net/10722/144979
ISSN
2015 Impact Factor: 2.455
2015 SCImago Journal Rankings: 1.726
ISI Accession Number ID
Funding AgencyGrant Number
Singapore National Research Foundation (NRF) through the Singapore-MIT Alliance for Research and Technology (SMART) Center for Environmental Sensing and Modeling (CENSAM)
Funding Information:

This project was funded by Singapore National Research Foundation (NRF) through the Singapore-MIT Alliance for Research and Technology (SMART) Center for Environmental Sensing and Modeling (CENSAM).

References

 

DC FieldValueLanguage
dc.contributor.authorLi, XXen_HK
dc.contributor.authorBritter, REen_HK
dc.contributor.authorKoh, TYen_HK
dc.contributor.authorNorford, LKen_HK
dc.contributor.authorLiu, CHen_HK
dc.contributor.authorEntekhabi, Den_HK
dc.contributor.authorLeung, DYCen_HK
dc.date.accessioned2012-02-21T05:43:14Z-
dc.date.available2012-02-21T05:43:14Z-
dc.date.issued2010en_HK
dc.identifier.citationBoundary-Layer Meteorology, 2010, v. 137 n. 2, p. 187-204en_HK
dc.identifier.issn0006-8314en_HK
dc.identifier.urihttp://hdl.handle.net/10722/144979-
dc.description.abstractOur study employed large-eddy simulation (LES) based on a one-equation subgrid-scale model to investigate the flow field and pollutant dispersion characteristics inside urban street canyons. Unstable thermal stratification was produced by heating the ground of the street canyon. Using the Boussinesq approximation, thermal buoyancy forces were taken into account in both the Navier-Stokes equations and the transport equation for subgrid-scale turbulent kinetic energy (TKE). The LESs were validated against experimental data obtained in wind-tunnel studies before the model was applied to study the detailed turbulence, temperature, and pollutant dispersion characteristics in the street canyon of aspect ratio 1. The effects of different Richardson numbers (Ri) were investigated. The ground heating significantly enhanced mean flow, turbulence, and pollutant flux inside the street canyon, but weakened the shear at the roof level. The mean flow was observed to be no longer isolated from the free stream and fresh air could be entrained into the street canyon at the roof-level leeward corner. Weighed against higher temperature, the ground heating facilitated pollutant removal from the street canyon. © 2010 The Author(s).en_HK
dc.languageengen_US
dc.publisherSpringer Verlag Dordrecht. The Journal's web site is located at http://springerlink.metapress.com/openurl.asp?genre=journal&issn=0006-8314en_HK
dc.relation.ispartofBoundary-Layer Meteorologyen_HK
dc.rightsThe Author(s)en_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong Licenseen_US
dc.subjectGround heatingen_HK
dc.subjectLarge-eddy simulationen_HK
dc.subjectPollutant dispersionen_HK
dc.subjectUnstable stratificationen_HK
dc.subjectUrban street canyonen_HK
dc.titleLarge-Eddy Simulation of Flow and Pollutant Transport in Urban Street Canyons with Ground Heatingen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4551/resserv?sid=springerlink&genre=article&atitle=Large-Eddy Simulation of Flow and Pollutant Transport in Urban Street Canyons with Ground Heating&title=Boundary-Layer Meteorology&issn=00068314&date=2010-11-01&volume=137&issue=2& spage=187&authors=Xian-Xiang Li, Rex E. Britter, Tieh Yong Koh, <i>et al.</i>en_US
dc.identifier.emailLiu, CH:chliu@hkucc.hku.hken_HK
dc.identifier.emailLeung, DYC:ycleung@hku.hken_HK
dc.identifier.authorityLiu, CH=rp00152en_HK
dc.identifier.authorityLeung, DYC=rp00149en_HK
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1007/s10546-010-9534-8en_HK
dc.identifier.scopuseid_2-s2.0-77957955879en_HK
dc.identifier.hkuros179333-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77957955879&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume137en_HK
dc.identifier.issue2en_HK
dc.identifier.spage187en_HK
dc.identifier.epage204en_HK
dc.identifier.eissn1573-1472en_US
dc.identifier.isiWOS:000282696600002-
dc.publisher.placeNetherlandsen_HK
dc.description.otherSpringer Open Choice, 21 Feb 2012en_US
dc.identifier.scopusauthoridLi, XX=8091988100en_HK
dc.identifier.scopusauthoridBritter, RE=26642871900en_HK
dc.identifier.scopusauthoridKoh, TY=32867786300en_HK
dc.identifier.scopusauthoridNorford, LK=7004632109en_HK
dc.identifier.scopusauthoridLiu, CH=36065161300en_HK
dc.identifier.scopusauthoridEntekhabi, D=35517567400en_HK
dc.identifier.scopusauthoridLeung, DYC=7203002484en_HK
dc.identifier.citeulike7780605-

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