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Article: Large-eddy simulation of flow and pollutant transport in street canyons of different building-height-to-street-width ratios

TitleLarge-eddy simulation of flow and pollutant transport in street canyons of different building-height-to-street-width ratios
Authors
Issue Date2004
PublisherAmerican Meteorological Society. The Journal's web site is located at http://www.ametsoc.org/ams
Citation
Journal of Applied Meteorology, 2004, v. 43 n. 10, p. 1410-1424 How to Cite?
AbstractThis study employs a large-eddy simulation technique to investigate the flow, turbulence structure, and pollutant transport in street canyons of building-height-to-street-width (aspect) ratios of 0.5, 1.0, and 2.0 at a Reynolds number of 12 000 and a Schmidt number of 0.72. When the approaching wind is perpendicular to the street axis, a single primary recirculation is calculated for the street canyons of aspect ratios 0.5 and 1.0, and two vertically aligned, counterrotating primary recirculations are found for the street canyon of aspect ratio 2.0. Two to three secondary recirculations are also calculated at the corners of the street canyons. A ground-level passive pollutant line source is used to simulate vehicular emission. The turbulence intensities, pollutant concentration variance, and pollutant fluxes are analyzed to show that the pollutant removal by turbulent transport occurs at the leeward roof level for all aspect ratios. Whereas the ground-level pollutant concentration is greatest at the leeward corner of the street canyons of aspect ratios 0.5 and 1.0, the ground-level pollutant concentration in a street canyon of aspect ratio 2.0 occurs at the windward corner and is greater than the peak concentrations of the other two cases. Because of the smaller ground-level wind speed and the domination of turbulent pollutant transport between the vertically aligned recirculations, the ground-level air quality is poor in street canyons of large aspect ratios. The retention of pollutant in the street canyons is calculated to be 95%, 97%, and 99% for aspect ratios of 0.5, 1.0, and 2.0, respectively. © 2004 American Meteorological Society.
Persistent Identifierhttp://hdl.handle.net/10722/156720
ISSN
2005 Impact Factor: 1.702
References

 

DC FieldValueLanguage
dc.contributor.authorLiu, CHen_US
dc.contributor.authorBarth, MCen_US
dc.contributor.authorLeung, DYCen_US
dc.date.accessioned2012-08-08T08:43:40Z-
dc.date.available2012-08-08T08:43:40Z-
dc.date.issued2004en_US
dc.identifier.citationJournal of Applied Meteorology, 2004, v. 43 n. 10, p. 1410-1424en_US
dc.identifier.issn0894-8763en_US
dc.identifier.urihttp://hdl.handle.net/10722/156720-
dc.description.abstractThis study employs a large-eddy simulation technique to investigate the flow, turbulence structure, and pollutant transport in street canyons of building-height-to-street-width (aspect) ratios of 0.5, 1.0, and 2.0 at a Reynolds number of 12 000 and a Schmidt number of 0.72. When the approaching wind is perpendicular to the street axis, a single primary recirculation is calculated for the street canyons of aspect ratios 0.5 and 1.0, and two vertically aligned, counterrotating primary recirculations are found for the street canyon of aspect ratio 2.0. Two to three secondary recirculations are also calculated at the corners of the street canyons. A ground-level passive pollutant line source is used to simulate vehicular emission. The turbulence intensities, pollutant concentration variance, and pollutant fluxes are analyzed to show that the pollutant removal by turbulent transport occurs at the leeward roof level for all aspect ratios. Whereas the ground-level pollutant concentration is greatest at the leeward corner of the street canyons of aspect ratios 0.5 and 1.0, the ground-level pollutant concentration in a street canyon of aspect ratio 2.0 occurs at the windward corner and is greater than the peak concentrations of the other two cases. Because of the smaller ground-level wind speed and the domination of turbulent pollutant transport between the vertically aligned recirculations, the ground-level air quality is poor in street canyons of large aspect ratios. The retention of pollutant in the street canyons is calculated to be 95%, 97%, and 99% for aspect ratios of 0.5, 1.0, and 2.0, respectively. © 2004 American Meteorological Society.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.rightsJournal of Applied Meteorology. Copyright © American Meteorological Society.-
dc.titleLarge-eddy simulation of flow and pollutant transport in street canyons of different building-height-to-street-width ratiosen_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.scopuseid_2-s2.0-10244240564en_US
dc.identifier.hkuros98501-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-10244240564&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume43en_US
dc.identifier.issue10en_US
dc.identifier.spage1410en_US
dc.identifier.epage1424en_US
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridLiu, CH=36065161300en_US
dc.identifier.scopusauthoridBarth, MC=7102913661en_US
dc.identifier.scopusauthoridLeung, DYC=7203002484en_US

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