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Conference Paper: Large-eddy simulation of turbulent flows and pollutant transport inside and above idealized urban street canyons under different unstable thermal stratification

TitleLarge-eddy simulation of turbulent flows and pollutant transport inside and above idealized urban street canyons under different unstable thermal stratification
Authors
Issue Date2013
Citation
The 2013 European and African Conference on Wind Engineering (EACWE 2013), Cambridge, UK., 7-11 July 2013. How to Cite?
AbstractLarge-eddy simulation (LES) is employed to study the behaviours of flows and pollutant transport inside and over idealized urban street canyons under different unstable thermal stratification. Three configurations of idealized street canyon, consisting of building-height-to-street-width (aspect) ratios, 0.5, 1 and 2, are considered. Under unstable stratification, the vertical profiles of streamwise velocity and temperature over the bottom rough surface are more uniform and the turbulent transport of momentum and heat are enhanced. Inside the street canyons, the ventilation performance, which are characterized by the air exchange rate (ACH), pollutant exchange rate (PCH), pollutant retention time and average pollutant concentration, is found improved in unstable stratification.
Persistent Identifierhttp://hdl.handle.net/10722/190043

 

DC FieldValueLanguage
dc.contributor.authorChan, MCen_US
dc.contributor.authorLiu, CHen_US
dc.date.accessioned2013-09-17T15:04:42Z-
dc.date.available2013-09-17T15:04:42Z-
dc.date.issued2013en_US
dc.identifier.citationThe 2013 European and African Conference on Wind Engineering (EACWE 2013), Cambridge, UK., 7-11 July 2013.en_US
dc.identifier.urihttp://hdl.handle.net/10722/190043-
dc.description.abstractLarge-eddy simulation (LES) is employed to study the behaviours of flows and pollutant transport inside and over idealized urban street canyons under different unstable thermal stratification. Three configurations of idealized street canyon, consisting of building-height-to-street-width (aspect) ratios, 0.5, 1 and 2, are considered. Under unstable stratification, the vertical profiles of streamwise velocity and temperature over the bottom rough surface are more uniform and the turbulent transport of momentum and heat are enhanced. Inside the street canyons, the ventilation performance, which are characterized by the air exchange rate (ACH), pollutant exchange rate (PCH), pollutant retention time and average pollutant concentration, is found improved in unstable stratification.-
dc.languageengen_US
dc.relation.ispartofEuropean and African Conference on Wind Engineering, EACWE 2013en_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleLarge-eddy simulation of turbulent flows and pollutant transport inside and above idealized urban street canyons under different unstable thermal stratificationen_US
dc.typeConference_Paperen_US
dc.identifier.emailChan, MC: zz047@hku.hken_US
dc.identifier.emailLiu, CH: chliu@hku.hken_US
dc.identifier.authorityLiu, CH=rp00152en_US
dc.description.naturepostprint-
dc.identifier.hkuros224515en_US
dc.customcontrol.immutablesml 140415-

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