File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Conference Paper: Large-eddy simulation of turbulent transports in urban street canyons in different thermal stabilities

TitleLarge-eddy simulation of turbulent transports in urban street canyons in different thermal stabilities
Authors
KeywordsLarge-Eddy Simulation
Pollutant Dispersion
Thermal Stratification
Turbulence
Urban Street Canyon
Issue Date2011
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jweia
Citation
5th International Symposium on Computational Wind Engineering. In Journal Of Wind Engineering And Industrial Aerodynamics, 2011, v. 99 n. 4, p. 434-442 How to Cite?
AbstractFive sets of large-eddy simulations (LES) were performed to examine the characteristics of flows and pollutant dispersion in two-dimensional (2D) urban street canyons of unity building-height-to-street-width ratio in neutral, unstable, and stable thermal stratifications. The characteristic flows fall into the skimming flow regime for all the cases tested. The mean wind speed is increased and decreased, respectively, in unstable and stable conditions. Turbulence is enhanced in unstable conditions. Whereas, in stable conditions, the low-level temperature inversion weakens the recirculating flows forming another layer of stagnant air in the vicinity of the ground level. Unexpectedly, an increase in turbulence is found in the street canyon core in the slightly stable condition (Richardson number Rb=0.18). The turbulence promotion could be caused by the unique geometry of 2D street canyon in which the stable stratification slows down the primary recirculation. The rather stagnant flows in turn sharpen the roof-level vertical velocity gradient and deter the entrainment penetrating down to the ground level, leading to a substantial pollutant accumulation. While the pollutant tends to be well mixed in the street canyons in neutral and unstable conditions, a mildly improved pollutant removal in unstable conditions is observed because of the enhanced roof-level buoyancy-driven turbulence. © 2010 Elsevier Ltd.
Persistent Identifierhttp://hdl.handle.net/10722/157111
ISSN
2015 Impact Factor: 2.024
2015 SCImago Journal Rankings: 1.097
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorCheng, WCen_US
dc.contributor.authorLiu, CHen_US
dc.date.accessioned2012-08-08T08:45:23Z-
dc.date.available2012-08-08T08:45:23Z-
dc.date.issued2011en_US
dc.identifier.citation5th International Symposium on Computational Wind Engineering. In Journal Of Wind Engineering And Industrial Aerodynamics, 2011, v. 99 n. 4, p. 434-442en_US
dc.identifier.issn0167-6105en_US
dc.identifier.urihttp://hdl.handle.net/10722/157111-
dc.description.abstractFive sets of large-eddy simulations (LES) were performed to examine the characteristics of flows and pollutant dispersion in two-dimensional (2D) urban street canyons of unity building-height-to-street-width ratio in neutral, unstable, and stable thermal stratifications. The characteristic flows fall into the skimming flow regime for all the cases tested. The mean wind speed is increased and decreased, respectively, in unstable and stable conditions. Turbulence is enhanced in unstable conditions. Whereas, in stable conditions, the low-level temperature inversion weakens the recirculating flows forming another layer of stagnant air in the vicinity of the ground level. Unexpectedly, an increase in turbulence is found in the street canyon core in the slightly stable condition (Richardson number Rb=0.18). The turbulence promotion could be caused by the unique geometry of 2D street canyon in which the stable stratification slows down the primary recirculation. The rather stagnant flows in turn sharpen the roof-level vertical velocity gradient and deter the entrainment penetrating down to the ground level, leading to a substantial pollutant accumulation. While the pollutant tends to be well mixed in the street canyons in neutral and unstable conditions, a mildly improved pollutant removal in unstable conditions is observed because of the enhanced roof-level buoyancy-driven turbulence. © 2010 Elsevier Ltd.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jweiaen_US
dc.relation.ispartofJournal of Wind Engineering and Industrial Aerodynamicsen_US
dc.subjectLarge-Eddy Simulationen_US
dc.subjectPollutant Dispersionen_US
dc.subjectThermal Stratificationen_US
dc.subjectTurbulenceen_US
dc.subjectUrban Street Canyonen_US
dc.titleLarge-eddy simulation of turbulent transports in urban street canyons in different thermal stabilitiesen_US
dc.typeConference_Paperen_US
dc.identifier.emailLiu, CH:chliu@hkucc.hku.hken_US
dc.identifier.authorityLiu, CH=rp00152en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.jweia.2010.12.009en_US
dc.identifier.scopuseid_2-s2.0-79955001079en_US
dc.identifier.hkuros195787-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79955001079&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume99en_US
dc.identifier.issue4en_US
dc.identifier.spage434en_US
dc.identifier.epage442en_US
dc.identifier.isiWOS:000290972900028-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridCheng, WC=24283028300en_US
dc.identifier.scopusauthoridLiu, CH=36065161300en_US
dc.identifier.citeulike8750423-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats