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Article: Computational formulation for the evaluation of street canyon ventilation and pollutant removal performance

TitleComputational formulation for the evaluation of street canyon ventilation and pollutant removal performance
Authors
KeywordsAir quality
Computational fluid dynamics (CFD)
K - ε Turbulence model
Reynolds-averaged Navier-Stokes (RANS) equations
Street canyon
Issue Date2008
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/atmosenv
Citation
Atmospheric Environment, 2008, v. 42 n. 40, p. 9041-9051 How to Cite?
AbstractA computational formulation using the concept of air exchange rate (ACH), pollutant exchange rate (PCH), average pollutant concentration (Θ) and pollutant retention time (τ) is proposed to evaluate the ventilation and pollutant removal performance of street canyons. Using computational fluid dynamics (CFD), the newly developed formulation is applied to two-dimensional (2D) idealized street canyons with different building-height-to-street-width (aspect) ratios. The Reynolds-averaged Navier-Stokes (RANS) equations equipped with the Renormalization Group (RNG) k - ε turbulence model is adopted. The accuracy of three numerical discretizations, including the 1st-order upwind, 2nd-order upwind and 3rd-order monotone upstream-centered schemes for conservation laws (MUSCL), are compared by considering the pollutant conservation. It is found that the 1st-order upwind is not accurate enough for the pollutant transport mainly due to its over dissipative nature while the 2nd-order upwind and 3rd-order MUSCL exhibit an error of 10%. The ACH and PCH are decomposed into the mean and turbulent components in which the roof-level transport processes are dominated by the turbulent component. The spatial distributions of the vertical wind velocity and pollutant flux are also investigated to examine the ventilation and pollutant removal mechanisms of street canyons. © 2008 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/59047
ISSN
2015 Impact Factor: 3.459
2015 SCImago Journal Rankings: 1.999
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Research Grant CouncilHKU7111/04E
University Research Committee of the University of Hong Kong
Funding Information:

This project is partially supported by the Hong Kong Research Grant Council (HKU7111/04E) and the University Research Committee of the University of Hong Kong.

References

 

DC FieldValueLanguage
dc.contributor.authorCheng, WCen_HK
dc.contributor.authorLiu, CHen_HK
dc.contributor.authorLeung, DYCen_HK
dc.date.accessioned2010-05-31T03:41:59Z-
dc.date.available2010-05-31T03:41:59Z-
dc.date.issued2008en_HK
dc.identifier.citationAtmospheric Environment, 2008, v. 42 n. 40, p. 9041-9051en_HK
dc.identifier.issn1352-2310en_HK
dc.identifier.urihttp://hdl.handle.net/10722/59047-
dc.description.abstractA computational formulation using the concept of air exchange rate (ACH), pollutant exchange rate (PCH), average pollutant concentration (Θ) and pollutant retention time (τ) is proposed to evaluate the ventilation and pollutant removal performance of street canyons. Using computational fluid dynamics (CFD), the newly developed formulation is applied to two-dimensional (2D) idealized street canyons with different building-height-to-street-width (aspect) ratios. The Reynolds-averaged Navier-Stokes (RANS) equations equipped with the Renormalization Group (RNG) k - ε turbulence model is adopted. The accuracy of three numerical discretizations, including the 1st-order upwind, 2nd-order upwind and 3rd-order monotone upstream-centered schemes for conservation laws (MUSCL), are compared by considering the pollutant conservation. It is found that the 1st-order upwind is not accurate enough for the pollutant transport mainly due to its over dissipative nature while the 2nd-order upwind and 3rd-order MUSCL exhibit an error of 10%. The ACH and PCH are decomposed into the mean and turbulent components in which the roof-level transport processes are dominated by the turbulent component. The spatial distributions of the vertical wind velocity and pollutant flux are also investigated to examine the ventilation and pollutant removal mechanisms of street canyons. © 2008 Elsevier Ltd. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/atmosenven_HK
dc.relation.ispartofAtmospheric Environmenten_HK
dc.subjectAir qualityen_HK
dc.subjectComputational fluid dynamics (CFD)en_HK
dc.subjectK - ε Turbulence modelen_HK
dc.subjectReynolds-averaged Navier-Stokes (RANS) equationsen_HK
dc.subjectStreet canyonen_HK
dc.titleComputational formulation for the evaluation of street canyon ventilation and pollutant removal performanceen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1352-2310&volume=42&spage=9041&epage=9051&date=2008&atitle=Computational+formulation+for+the+evaluation+of+street+canyon+ventilation+and+pollutant+removal+performanceen_HK
dc.identifier.emailLiu, CH:chliu@hkucc.hku.hken_HK
dc.identifier.emailLeung, DYC:ycleung@hku.hken_HK
dc.identifier.authorityLiu, CH=rp00152en_HK
dc.identifier.authorityLeung, DYC=rp00149en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.atmosenv.2008.09.045en_HK
dc.identifier.scopuseid_2-s2.0-56249095132en_HK
dc.identifier.hkuros154696en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-56249095132&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume42en_HK
dc.identifier.issue40en_HK
dc.identifier.spage9041en_HK
dc.identifier.epage9051en_HK
dc.identifier.isiWOS:000261857700005-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridCheng, WC=24283028300en_HK
dc.identifier.scopusauthoridLiu, CH=36065161300en_HK
dc.identifier.scopusauthoridLeung, DYC=7203002484en_HK

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