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Conference Paper: Large-eddy simulatoin of flow field and pollutant dispession in urban street canyons under unstable atmospheric

TitleLarge-eddy simulatoin of flow field and pollutant dispession in urban street canyons under unstable atmospheric
Authors
KeywordsLarge-eddy simulation (LES)
Thermal effect
Street canyon
Pollutant dispersion
Issue Date2009
Citation
The 7th International Conference of Urban Climate (ICUC-7), Yokohama, Japan, 29 June-3 July 2009. How to Cite?
AbstractThermal stratification plays an important role in the air flow and pollutant dispersion processes. This study employed a large-eddy simulation (LES) code based on a one-equation subgrid-scale (SGS) model to investigate the flow field and pollutant dispersion characteristics inside urban street canyons. The unstable thermal stratification was simulated by heating the ground level of the street canyons. The thermal buoyancy forces were, using the Boussinesq assumption, taken into account in both the Navier-Stokes equations and the transport equation for SGS turbulent kinetic energy (TKE). The LES had been validated against experimental data obtained in wind tunnel studies before it was applied to study the detailed turbulence and pollutant dispersion characteristics in urban street canyons. The effects of different bulk Richardson number (Rb) were investigated. Several typical temperature differences between the street bottom and ambient air were configured to simulate the scenarios occurring at different times during the day.
Persistent Identifierhttp://hdl.handle.net/10722/126318

 

DC FieldValueLanguage
dc.contributor.authorLi, XXen_HK
dc.contributor.authorKoh, TYen_HK
dc.contributor.authorBritter, Ren_HK
dc.contributor.authorLiu, CHen_HK
dc.contributor.authorNorford, LKen_HK
dc.contributor.authorEntekhabi, Den_HK
dc.contributor.authorLeung, DYCen_HK
dc.date.accessioned2010-10-31T12:21:48Z-
dc.date.available2010-10-31T12:21:48Z-
dc.date.issued2009en_HK
dc.identifier.citationThe 7th International Conference of Urban Climate (ICUC-7), Yokohama, Japan, 29 June-3 July 2009.en_HK
dc.identifier.urihttp://hdl.handle.net/10722/126318-
dc.description.abstractThermal stratification plays an important role in the air flow and pollutant dispersion processes. This study employed a large-eddy simulation (LES) code based on a one-equation subgrid-scale (SGS) model to investigate the flow field and pollutant dispersion characteristics inside urban street canyons. The unstable thermal stratification was simulated by heating the ground level of the street canyons. The thermal buoyancy forces were, using the Boussinesq assumption, taken into account in both the Navier-Stokes equations and the transport equation for SGS turbulent kinetic energy (TKE). The LES had been validated against experimental data obtained in wind tunnel studies before it was applied to study the detailed turbulence and pollutant dispersion characteristics in urban street canyons. The effects of different bulk Richardson number (Rb) were investigated. Several typical temperature differences between the street bottom and ambient air were configured to simulate the scenarios occurring at different times during the day.-
dc.languageengen_HK
dc.relation.ispartofInternational Conference of Urban Climate, ICUC-7en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectLarge-eddy simulation (LES)-
dc.subjectThermal effect-
dc.subjectStreet canyon-
dc.subjectPollutant dispersion-
dc.titleLarge-eddy simulatoin of flow field and pollutant dispession in urban street canyons under unstable atmosphericen_HK
dc.typeConference_Paperen_HK
dc.identifier.emailLiu, CH: chliu@hkucc.hku.hken_HK
dc.identifier.emailLeung, DYC: ycleung@hku.hken_HK
dc.description.naturepostprint-
dc.identifier.hkuros159572en_HK
dc.identifier.hkuros171135-
dc.description.otherThe 7th International Conference of Urban Climate (ICUC-7), Yokohama, Japan, 29 June-3 July 2009.-

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