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Article: Large-eddy simulation of flow and pollutant dispersion in high-aspect-ratio urban street canyons with wall model

TitleLarge-eddy simulation of flow and pollutant dispersion in high-aspect-ratio urban street canyons with wall model
Authors
KeywordsLarge-Eddy Simulation (Les)
One-Equation Sgs Model
Pollutant Dispersion
Subgrid-Scale (Sgs) Model
Wall Model
Issue Date2008
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, 2008, v. 129 n. 2, p. 249-268 How to Cite?
AbstractA large-eddy simulation (LES) with a one-equation subgrid-scale (SGS) model was developed to investigate the flow field and pollutant dispersion inside street canyons of high aspect ratio (AR). A 1/7th power-law wall model was implemented near rigid walls to mitigate the demanding near-wall resolution requirements in LES. This LES model had been extensively validated against experimental results for street canyons of AR = 1 and 2 before it was applied to the cases of AR = 3 and 5. A ground-level passive pollutant line source, located in the middle of the street, was used to simulate vehicular emissions. Three and five vertically aligned primary recirculations were developed in the street canyons of AR 3 and 5, respectively. The ground-level mean wind speed was less than 0.5% of the free stream value, which makes it difficult for the pollutant to be transported upward for removal. High pollutant concentration and variance were found near the buildings where the air flow is upwards. It was found that the velocity fluctuation, pollutant concentration and variance were all closely related to the interactions between the primary recirculations and/or the free surface layer. Several quantities, which are non-linear functions of AR, were introduced to quantify the air quality in street canyons of different configurations. © Springer Science+Business Media B.V. 2008.
Persistent Identifierhttp://hdl.handle.net/10722/156982
ISSN
2015 Impact Factor: 2.455
2015 SCImago Journal Rankings: 1.726
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, XXen_US
dc.contributor.authorLiu, CHen_US
dc.contributor.authorLeung, DYCen_US
dc.date.accessioned2012-08-08T08:44:48Z-
dc.date.available2012-08-08T08:44:48Z-
dc.date.issued2008en_US
dc.identifier.citationBoundary-Layer Meteorology, 2008, v. 129 n. 2, p. 249-268en_US
dc.identifier.issn0006-8314en_US
dc.identifier.urihttp://hdl.handle.net/10722/156982-
dc.description.abstractA large-eddy simulation (LES) with a one-equation subgrid-scale (SGS) model was developed to investigate the flow field and pollutant dispersion inside street canyons of high aspect ratio (AR). A 1/7th power-law wall model was implemented near rigid walls to mitigate the demanding near-wall resolution requirements in LES. This LES model had been extensively validated against experimental results for street canyons of AR = 1 and 2 before it was applied to the cases of AR = 3 and 5. A ground-level passive pollutant line source, located in the middle of the street, was used to simulate vehicular emissions. Three and five vertically aligned primary recirculations were developed in the street canyons of AR 3 and 5, respectively. The ground-level mean wind speed was less than 0.5% of the free stream value, which makes it difficult for the pollutant to be transported upward for removal. High pollutant concentration and variance were found near the buildings where the air flow is upwards. It was found that the velocity fluctuation, pollutant concentration and variance were all closely related to the interactions between the primary recirculations and/or the free surface layer. Several quantities, which are non-linear functions of AR, were introduced to quantify the air quality in street canyons of different configurations. © Springer Science+Business Media B.V. 2008.en_US
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_US
dc.relation.ispartofBoundary-Layer Meteorologyen_US
dc.subjectLarge-Eddy Simulation (Les)en_US
dc.subjectOne-Equation Sgs Modelen_US
dc.subjectPollutant Dispersionen_US
dc.subjectSubgrid-Scale (Sgs) Modelen_US
dc.subjectWall Modelen_US
dc.titleLarge-eddy simulation of flow and pollutant dispersion in high-aspect-ratio urban street canyons with wall modelen_US
dc.typeArticleen_US
dc.identifier.emailLiu, CH:chliu@hkucc.hku.hken_US
dc.identifier.emailLeung, DYC:ycleung@hku.hken_US
dc.identifier.authorityLiu, CH=rp00152en_US
dc.identifier.authorityLeung, DYC=rp00149en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1007/s10546-008-9313-yen_US
dc.identifier.scopuseid_2-s2.0-54049115413en_US
dc.identifier.hkuros154697-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-54049115413&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume129en_US
dc.identifier.issue2en_US
dc.identifier.spage249en_US
dc.identifier.epage268en_US
dc.identifier.isiWOS:000259859600005-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridLi, XX=8091988100en_US
dc.identifier.scopusauthoridLiu, CH=36065161300en_US
dc.identifier.scopusauthoridLeung, DYC=7203002484en_US
dc.identifier.citeulike3643621-

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