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Article: Wind conditions in idealized building clusters: Macroscopic simulations using a porous turbulence model

TitleWind conditions in idealized building clusters: Macroscopic simulations using a porous turbulence model
Authors
KeywordsBuilding array
Macroscopic simulation
Porosity
Porous media
Porous turbulence model
Issue Date2010
PublisherSpringer Verlag Dordrecht. The Journal's web site is located at http://springerlink.metapress.com/openurl.asp?genre=journal&issn=0006-8314
Citation
Boundary-Layer Meteorology, 2010, v. 136 n. 1, p. 129-159 How to Cite?
AbstractSimulating turbulent flows in a city of many thousands of buildings using general high-resolution microscopic simulations requires a grid number that is beyond present computer resources. We thus regard a city as porous media and divide the whole hybrid domain into a porous city region and a clear fluid region, which are represented by a macroscopic k-ε model. Some microscopic information is neglected by the volume-averaging technique in the porous city to reduce the calculation load. A single domain approach is used to account for the interface conditions. We investigated the turbulent airflow through aligned cube arrays (with 7, 14 or 21 rows). The building height H, the street width W, and the building width B are the same (0.15 m), and the fraction of the volume occupied by fluid (i. e. the porosity) is 0.75; the approaching flow is parallel to the main streets. There are both microscopic and macroscopic simulations, with microscopic simulations being well validated by experimental data. We analysed microscopic wind conditions and the ventilation capacity in such cube arrays, and then calculated macroscopic time-averaged properties to provide a comparison for macroscopic simulations. We found that the macroscopic k-ε turbulence model predicted the macroscopic flow reduction through porous cube clusters relatively well, but under-predicted the macroscopic turbulent kinetic energy (TKE) near the windward edge of the porous region. For a sufficiently long porous cube array, macroscopic flow quantities maintain constant conditions in a fully developed region. © 2010 The Author(s).
Persistent Identifierhttp://hdl.handle.net/10722/144982
ISSN
2015 Impact Factor: 2.455
2015 SCImago Journal Rankings: 1.726
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong SAR GovernmentHKU 7145/07E
Funding Information:

The study is supported by a grant 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.authorLi, Yen_HK
dc.date.accessioned2012-02-21T05:43:25Z-
dc.date.available2012-02-21T05:43:25Z-
dc.date.issued2010en_HK
dc.identifier.citationBoundary-Layer Meteorology, 2010, v. 136 n. 1, p. 129-159en_HK
dc.identifier.issn0006-8314en_HK
dc.identifier.urihttp://hdl.handle.net/10722/144982-
dc.description.abstractSimulating turbulent flows in a city of many thousands of buildings using general high-resolution microscopic simulations requires a grid number that is beyond present computer resources. We thus regard a city as porous media and divide the whole hybrid domain into a porous city region and a clear fluid region, which are represented by a macroscopic k-ε model. Some microscopic information is neglected by the volume-averaging technique in the porous city to reduce the calculation load. A single domain approach is used to account for the interface conditions. We investigated the turbulent airflow through aligned cube arrays (with 7, 14 or 21 rows). The building height H, the street width W, and the building width B are the same (0.15 m), and the fraction of the volume occupied by fluid (i. e. the porosity) is 0.75; the approaching flow is parallel to the main streets. There are both microscopic and macroscopic simulations, with microscopic simulations being well validated by experimental data. We analysed microscopic wind conditions and the ventilation capacity in such cube arrays, and then calculated macroscopic time-averaged properties to provide a comparison for macroscopic simulations. We found that the macroscopic k-ε turbulence model predicted the macroscopic flow reduction through porous cube clusters relatively well, but under-predicted the macroscopic turbulent kinetic energy (TKE) near the windward edge of the porous region. For a sufficiently long porous cube array, macroscopic flow quantities maintain constant conditions in a fully developed region. © 2010 The Author(s).en_HK
dc.languageengen_US
dc.publisherSpringer Verlag Dordrecht. The Journal's web site is located at http://springerlink.metapress.com/openurl.asp?genre=journal&issn=0006-8314en_HK
dc.relation.ispartofBoundary-Layer Meteorologyen_HK
dc.rightsThe Author(s)en_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong Licenseen_US
dc.subjectBuilding arrayen_HK
dc.subjectMacroscopic simulationen_HK
dc.subjectPorosityen_HK
dc.subjectPorous mediaen_HK
dc.subjectPorous turbulence modelen_HK
dc.titleWind conditions in idealized building clusters: Macroscopic simulations using a porous turbulence modelen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4551/resserv?sid=springerlink&genre=article&atitle=Wind Conditions in Idealized Building Clusters: Macroscopic Simulations Using a Porous Turbulence Model&title=Boundary-Layer Meteorology&issn=00068314&date=2010-07-01&volume=136&issue=1& spage=129&authors=Jian Hang, Yuguo Lien_US
dc.identifier.emailLi, Y:liyg@hkucc.hku.hken_HK
dc.identifier.authorityLi, Y=rp00151en_HK
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1007/s10546-010-9490-3en_HK
dc.identifier.scopuseid_2-s2.0-77953690379en_HK
dc.identifier.hkuros180424-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77953690379&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume136en_HK
dc.identifier.issue1en_HK
dc.identifier.spage129en_HK
dc.identifier.epage159en_HK
dc.identifier.eissn1573-1472en_US
dc.identifier.isiWOS:000278717300007-
dc.publisher.placeNetherlandsen_HK
dc.description.otherSpringer Open Choice, 21 Feb 2012en_US
dc.identifier.scopusauthoridHang, J=35240092500en_HK
dc.identifier.scopusauthoridLi, Y=7502094052en_HK
dc.identifier.citeulike7077521-

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