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Conference Paper: A theory on the ventilation over hypothetical urban areas

TitleA theory on the ventilation over hypothetical urban areas
Authors
KeywordsEarth sciences
Issue Date2013
PublisherCopernicus GmbH. The Journal's web site is located at http://www.geophysical-research-abstracts.net
Citation
The 10th General Assembly of the European Geosciences Union (EGU 2013), Vienna, Austria, 7-12 April 2013. In Geophysical Research Abstracts, 2013, v. 15, no. EGU2013-1643 How to Cite?
AbstractUrban roughness is one of the major factors affecting the flows and turbulence structures in the bottom of the atmospheric boundary layer (ABL). Whereas, our understanding of their relation is limited. In this paper, we attempt to examine the interaction among aerodynamic resistance (friction factor f), ventilation (air exchange rate ACH), and pollutant removal (pollutant removal rate PCH). Using the method of characteristic, analytical solution shows that the turbulent ventilation of a hypothetical urban area is directly proportional to the square root of friction factor (ACH? f1-2) regardless of the building geometry. Next, a series of computational fluid dynamics (CFD) sensitivity tests are performed to verify the theory. In addition to the commonly employed rectangular building mod...
Persistent Identifierhttp://hdl.handle.net/10722/190051
ISSN

 

DC FieldValueLanguage
dc.contributor.authorLiu, CHen_US
dc.contributor.authorNg, CTen_US
dc.contributor.authorWong, CCCen_US
dc.date.accessioned2013-09-17T15:04:43Z-
dc.date.available2013-09-17T15:04:43Z-
dc.date.issued2013en_US
dc.identifier.citationThe 10th General Assembly of the European Geosciences Union (EGU 2013), Vienna, Austria, 7-12 April 2013. In Geophysical Research Abstracts, 2013, v. 15, no. EGU2013-1643en_US
dc.identifier.issn1607-7962-
dc.identifier.urihttp://hdl.handle.net/10722/190051-
dc.description.abstractUrban roughness is one of the major factors affecting the flows and turbulence structures in the bottom of the atmospheric boundary layer (ABL). Whereas, our understanding of their relation is limited. In this paper, we attempt to examine the interaction among aerodynamic resistance (friction factor f), ventilation (air exchange rate ACH), and pollutant removal (pollutant removal rate PCH). Using the method of characteristic, analytical solution shows that the turbulent ventilation of a hypothetical urban area is directly proportional to the square root of friction factor (ACH? f1-2) regardless of the building geometry. Next, a series of computational fluid dynamics (CFD) sensitivity tests are performed to verify the theory. In addition to the commonly employed rectangular building mod...-
dc.languageengen_US
dc.publisherCopernicus GmbH. The Journal's web site is located at http://www.geophysical-research-abstracts.net-
dc.relation.ispartofGeophysical Research Abstractsen_US
dc.rightsAuthor holds the copyright-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectEarth sciences-
dc.titleA theory on the ventilation over hypothetical urban areasen_US
dc.typeConference_Paperen_US
dc.identifier.emailLiu, CH: chliu@hku.hken_US
dc.identifier.emailWong, CCC: coccwong@hku.hk-
dc.identifier.authorityLiu, CH=rp00152en_US
dc.description.naturepublished_or_final_version-
dc.identifier.hkuros224525en_US
dc.identifier.volume15-
dc.publisher.placeGermany-

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