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Article: Flow mechanisms and flow capacity in idealized long-street city models

TitleFlow mechanisms and flow capacity in idealized long-street city models
Authors
KeywordsAspect ratio
CFD simulation
Flow rate
Long streets
Total energy density
Wind tunnel
Issue Date2010
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/buildenv
Citation
Building And Environment, 2010, v. 45 n. 4, p. 1042-1053 How to Cite?
AbstractIt is an open question whether a street network of a city has a certain flow capacity characterizing the flow that can pass through the street network. It s our hypothesis that at least the simple street network has a certain flow capacity. With the purpose of exploring this we studied numerically and experimentally the flow capacity in some idealized long-street models continuously lined with buildings and exposed to a parallel approaching wind. The height of all the models is the same (H = 69 mm). Three groups of models were studied: models with the same uniform street width (W = H) but different lengths (L = 21.7H, 43.5H, 72.5H); models with the same length (L = 43.5H) but different uniform width (W = H, 2H, 4H); and models with a change of width at half distance, L/2. In the last of the three cases, the width of the upstream half was always the same (W1 = H), but there was a wider (W2 = 1.25H, 1.5H, 2H) or narrower (W2 = 0.75H, 0.5H) downstream half. We normalized flow rates by a reference flow rate equal to the flow rate through an opening far upstream with the same area as the windward entry. The normalized flow rate through the windward entry was about 1.0 in all cases. For a sufficiently long-street models, a flow balance is established, creating a fully developed region with a constant horizontal flow (flow capacity) and zero vertical mean velocity. The street length does not affect the flow capacity but as expected the width of the street affects the flow capacity. © 2009 Elsevier Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/124856
ISSN
2015 Impact Factor: 3.394
2015 SCImago Journal Rankings: 2.121
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of the Hong Kong SAR GovernmentHKU 7145/07E
Funding Information:

This work was supported by a grant entitled "CityVent - A Theory of Ventilation of a Dense and High-Rise City by Wind and Buoyancy Forces" from the Research Grants Council of the Hong Kong SAR Government (Project No. HKU 7145/07E).

References

 

DC FieldValueLanguage
dc.contributor.authorHang, Jen_HK
dc.contributor.authorSandberg, Men_HK
dc.contributor.authorLi, Yen_HK
dc.contributor.authorClaesson, Len_HK
dc.date.accessioned2010-10-31T10:57:59Z-
dc.date.available2010-10-31T10:57:59Z-
dc.date.issued2010en_HK
dc.identifier.citationBuilding And Environment, 2010, v. 45 n. 4, p. 1042-1053en_HK
dc.identifier.issn0360-1323en_HK
dc.identifier.urihttp://hdl.handle.net/10722/124856-
dc.description.abstractIt is an open question whether a street network of a city has a certain flow capacity characterizing the flow that can pass through the street network. It s our hypothesis that at least the simple street network has a certain flow capacity. With the purpose of exploring this we studied numerically and experimentally the flow capacity in some idealized long-street models continuously lined with buildings and exposed to a parallel approaching wind. The height of all the models is the same (H = 69 mm). Three groups of models were studied: models with the same uniform street width (W = H) but different lengths (L = 21.7H, 43.5H, 72.5H); models with the same length (L = 43.5H) but different uniform width (W = H, 2H, 4H); and models with a change of width at half distance, L/2. In the last of the three cases, the width of the upstream half was always the same (W1 = H), but there was a wider (W2 = 1.25H, 1.5H, 2H) or narrower (W2 = 0.75H, 0.5H) downstream half. We normalized flow rates by a reference flow rate equal to the flow rate through an opening far upstream with the same area as the windward entry. The normalized flow rate through the windward entry was about 1.0 in all cases. For a sufficiently long-street models, a flow balance is established, creating a fully developed region with a constant horizontal flow (flow capacity) and zero vertical mean velocity. The street length does not affect the flow capacity but as expected the width of the street affects the flow capacity. © 2009 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/buildenven_HK
dc.relation.ispartofBuilding and Environmenten_HK
dc.subjectAspect ratioen_HK
dc.subjectCFD simulationen_HK
dc.subjectFlow rateen_HK
dc.subjectLong streetsen_HK
dc.subjectTotal energy densityen_HK
dc.subjectWind tunnelen_HK
dc.titleFlow mechanisms and flow capacity in idealized long-street city modelsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0360-1323&volume=45&issue=4&spage=1042&epage=1053&date=2010&atitle=Flow+mechanisms+and+flow+capacity+in+idealized+long-street+city+modelsen_HK
dc.identifier.emailLi, Y:liyg@hkucc.hku.hken_HK
dc.identifier.authorityLi, Y=rp00151en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.buildenv.2009.10.014en_HK
dc.identifier.scopuseid_2-s2.0-71649098131en_HK
dc.identifier.hkuros180417en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-71649098131&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume45en_HK
dc.identifier.issue4en_HK
dc.identifier.spage1042en_HK
dc.identifier.epage1053en_HK
dc.identifier.isiWOS:000273945300030-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridHang, J=35240092500en_HK
dc.identifier.scopusauthoridSandberg, M=35585315900en_HK
dc.identifier.scopusauthoridLi, Y=7502094052en_HK
dc.identifier.scopusauthoridClaesson, L=8934695800en_HK
dc.identifier.citeulike6195048-

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