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Article: CFD simulation of 'pumping' flow mechanism of an urban building affected by an upstream building in high Reynolds flows

TitleCFD simulation of 'pumping' flow mechanism of an urban building affected by an upstream building in high Reynolds flows
Authors
KeywordsBuilding blocks
Numerical simulations
Oscillation
“pumping” wind flow
Issue Date2019
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/enbuild
Citation
Energy and Buildings, 2019, v. 202, p. article no. 109330 How to Cite?
Abstract“Pumping” flow, which is essentially induced by the periodic vortex shedding, was observed when natural wind blows across a single building with two leeward openings. This oscillating flow has been proposed for use to improve wind ventilation of buildings with single-sided openings. Existing studies are limited to a single building block. In this study, effect of an upstream building on the “pumping” ventilation is investigated for various obstacle spacings, by Computational Fluid Dynamics (CFD) simulations. Simulation results show that vortex shedding frequencies could be affected by the non-dimensional obstacle spacing W/B (gap distance/building width), whereas non-dimensional ventilation rate of the downstream building shows a non-linear correlation with the obstacle spacing W/B. Particularly, when W/B continuously increases to 2.0, the ventilation rate reaches the level comparable to that of the isolated block case. Further results also demonstrate that the “pumping” ventilation rates are determined by a combination of mean and fluctuating pressure differences between the leeward openings. The spacing W/B = 2 is the optimal spacing for largest ventilation rate and therefore lowest building energy consumption by Heating, Ventilation and Air Conditioning (HVAC) systems. Our findings could benefit sustainable building design in dense cities.
Persistent Identifierhttp://hdl.handle.net/10722/277965
ISSN
2017 Impact Factor: 4.457
2015 SCImago Journal Rankings: 2.073

 

DC FieldValueLanguage
dc.contributor.authorZhong, HY-
dc.contributor.authorJing, Y-
dc.contributor.authorLiu, Y-
dc.contributor.authorZhao, FY-
dc.contributor.authorLiu, D-
dc.contributor.authorLi, Y-
dc.date.accessioned2019-10-04T08:04:48Z-
dc.date.available2019-10-04T08:04:48Z-
dc.date.issued2019-
dc.identifier.citationEnergy and Buildings, 2019, v. 202, p. article no. 109330-
dc.identifier.issn0378-7788-
dc.identifier.urihttp://hdl.handle.net/10722/277965-
dc.description.abstract“Pumping” flow, which is essentially induced by the periodic vortex shedding, was observed when natural wind blows across a single building with two leeward openings. This oscillating flow has been proposed for use to improve wind ventilation of buildings with single-sided openings. Existing studies are limited to a single building block. In this study, effect of an upstream building on the “pumping” ventilation is investigated for various obstacle spacings, by Computational Fluid Dynamics (CFD) simulations. Simulation results show that vortex shedding frequencies could be affected by the non-dimensional obstacle spacing W/B (gap distance/building width), whereas non-dimensional ventilation rate of the downstream building shows a non-linear correlation with the obstacle spacing W/B. Particularly, when W/B continuously increases to 2.0, the ventilation rate reaches the level comparable to that of the isolated block case. Further results also demonstrate that the “pumping” ventilation rates are determined by a combination of mean and fluctuating pressure differences between the leeward openings. The spacing W/B = 2 is the optimal spacing for largest ventilation rate and therefore lowest building energy consumption by Heating, Ventilation and Air Conditioning (HVAC) systems. Our findings could benefit sustainable building design in dense cities.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/enbuild-
dc.relation.ispartofEnergy and Buildings-
dc.subjectBuilding blocks-
dc.subjectNumerical simulations-
dc.subjectOscillation-
dc.subject“pumping” wind flow-
dc.titleCFD simulation of 'pumping' flow mechanism of an urban building affected by an upstream building in high Reynolds flows-
dc.typeArticle-
dc.identifier.emailLi, Y: liyg@hku.hk-
dc.identifier.authorityLi, Y=rp00151-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.enbuild.2019.07.047-
dc.identifier.scopuseid_2-s2.0-85069804011-
dc.identifier.hkuros306608-
dc.identifier.volume202-
dc.identifier.spagearticle no. 109330-
dc.identifier.epagearticle no. 109330-
dc.publisher.placeNetherlands-

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