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Article: Numerical simulation of street canyon flows with simple building geometries

TitleNumerical simulation of street canyon flows with simple building geometries
Authors
KeywordsAir pollution
Environmental engineering
Flow simulation
Numerical models
Velocity
Issue Date2005
PublisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/ee.html
Citation
Journal Of Environmental Engineering, 2005, v. 131 n. 7, p. 1099-1105 How to Cite?
AbstractThe velocity and pressure fields of the flow over street canyons formed by groups of buildings are studied numerically. The flow fields are computed by solving the time-dependent incompressible Navier-Stokes equations using the fractional step method. The numerical model is validated by simulating flows over a square cylinder at different Reynolds numbers. The Strouhal numbers, which reflect the dynamic flow characteristics, agree well with published experimental data over a wide range of Reynolds numbers. The wind field model is then applied to two street canyon configurations. First, flows inside street canyons formed by four identical buildings are simulated. The incidental flow is raised by the most upstream building and becomes parallel to the ground at the rooftop level of the fourth building downstream, resulting in a clockwise rotating vortex in downstream street canyons with an inflow from left to right. Second, flows inside street canyons formed by two identical buildings are simulated. In this case, a primary eddy that is counterclockwise rotating may be formed due to flow separation at the front corner of the upstream building. A clockwise rotating primary eddy is formed in the wake area of the separate zone above the street canyon, which drives the counterclockwise rotating eddy in the street canyon. The result indicates that rooftop level flows cannot be assumed parallel to the ground as some modelers have done in their studies. Studies also show that flow regimes in the street canyon will remain unchanged while the inflow velocity is greatly increased from 0.1 to 6.0 m/s. In addition, the wind velocities in the street canyon have a linear response to the inflow velocity. Journal of Environmental Engineering © ASCE.
Persistent Identifierhttp://hdl.handle.net/10722/75540
ISSN
2015 Impact Factor: 1.125
2015 SCImago Journal Rankings: 0.462
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorXia, Jen_HK
dc.contributor.authorHussaini, MYen_HK
dc.contributor.authorLeung, DYCen_HK
dc.date.accessioned2010-09-06T07:12:10Z-
dc.date.available2010-09-06T07:12:10Z-
dc.date.issued2005en_HK
dc.identifier.citationJournal Of Environmental Engineering, 2005, v. 131 n. 7, p. 1099-1105en_HK
dc.identifier.issn0733-9372en_HK
dc.identifier.urihttp://hdl.handle.net/10722/75540-
dc.description.abstractThe velocity and pressure fields of the flow over street canyons formed by groups of buildings are studied numerically. The flow fields are computed by solving the time-dependent incompressible Navier-Stokes equations using the fractional step method. The numerical model is validated by simulating flows over a square cylinder at different Reynolds numbers. The Strouhal numbers, which reflect the dynamic flow characteristics, agree well with published experimental data over a wide range of Reynolds numbers. The wind field model is then applied to two street canyon configurations. First, flows inside street canyons formed by four identical buildings are simulated. The incidental flow is raised by the most upstream building and becomes parallel to the ground at the rooftop level of the fourth building downstream, resulting in a clockwise rotating vortex in downstream street canyons with an inflow from left to right. Second, flows inside street canyons formed by two identical buildings are simulated. In this case, a primary eddy that is counterclockwise rotating may be formed due to flow separation at the front corner of the upstream building. A clockwise rotating primary eddy is formed in the wake area of the separate zone above the street canyon, which drives the counterclockwise rotating eddy in the street canyon. The result indicates that rooftop level flows cannot be assumed parallel to the ground as some modelers have done in their studies. Studies also show that flow regimes in the street canyon will remain unchanged while the inflow velocity is greatly increased from 0.1 to 6.0 m/s. In addition, the wind velocities in the street canyon have a linear response to the inflow velocity. Journal of Environmental Engineering © ASCE.en_HK
dc.languageengen_HK
dc.publisherAmerican Society of Civil Engineers. The Journal's web site is located at http://www.pubs.asce.org/journals/ee.htmlen_HK
dc.relation.ispartofJournal of Environmental Engineeringen_HK
dc.rightsJournal of Environmental Engineering. Copyright © American Society of Civil Engineers.en_HK
dc.subjectAir pollutionen_HK
dc.subjectEnvironmental engineeringen_HK
dc.subjectFlow simulationen_HK
dc.subjectNumerical modelsen_HK
dc.subjectVelocityen_HK
dc.titleNumerical simulation of street canyon flows with simple building geometriesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0733-9372&volume=131&spage=1099&epage=1105&date=2005&atitle=Numerical+simulation+of+street+canyon+flows+with+simple+building+geometriesen_HK
dc.identifier.emailLeung, DYC:ycleung@hku.hken_HK
dc.identifier.authorityLeung, DYC=rp00149en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1061/(ASCE)0733-9372(2005)131:7(1099)en_HK
dc.identifier.scopuseid_2-s2.0-24044524221en_HK
dc.identifier.hkuros117388en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-24044524221&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume131en_HK
dc.identifier.issue7en_HK
dc.identifier.spage1099en_HK
dc.identifier.epage1105en_HK
dc.identifier.isiWOS:000230060000016-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridXia, J=8545421200en_HK
dc.identifier.scopusauthoridHussaini, MY=7005270275en_HK
dc.identifier.scopusauthoridLeung, DYC=7203002484en_HK

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