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Article: Two-dimensional numerical simulation of wind driven ventilation across a building enclosure with two free apertures on the rear side: Vortex shedding and 'pumping flow mechanism'

TitleTwo-dimensional numerical simulation of wind driven ventilation across a building enclosure with two free apertures on the rear side: Vortex shedding and 'pumping flow mechanism'
Authors
KeywordsWind-driven natural ventilation
Single-sided fluid flow
Vortex shedding
Numerical simulations
Issue Date2018
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jweia
Citation
Journal of Wind Engineering & Industrial Aerodynamics, 2018, v. 179, p. 449-462 How to Cite?
AbstractThis paper investigates the single-sided wind driven natural ventilation with two apertures on the rear wall, regarding different horizontal aperture separations, magnitudes of incoming wind speed and various side ratios (L/D, length/width). In the present work, CFD simulations are performed with Reynolds-Averaged Navier-Stokes (RANS) approach, and pressure correction linked equation is adopted to provide closure. The simulation results indicate that wind flow behind the rear wall is essentially driven by the pumping mechanism due to vortex shedding, in which wind flow direction alternates at a mean rate. The frequency of the “pumping” flow increases dramatically with the wind flow velocity at a wide range of Reynolds numbers. The decrease of free aperture separation reduces the enclosure flow rate whilst the frequency of the wind flow almost maintains at a constant value. The increase of sidewall length has similar impacts on the ventilation frequency and the dimensionless ventilation flow rate. Numerical investigations further demonstrate that non-dimensional ventilation rate can be promoted by increasing incoming wind velocities when the wind speed is less than 5 m/s. This promotion will be restrained when the wind speed is further increased. The simulation results of built enclosure flow rate, frequency of enclosure flow can be applied to improve the ventilation performance of buildings merely with rear wall openings.
Persistent Identifierhttp://hdl.handle.net/10722/277980
ISSN
2020 Impact Factor: 4.082
2015 SCImago Journal Rankings: 1.097
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhong, HY-
dc.contributor.authorZhang, DD-
dc.contributor.authorLiu, D-
dc.contributor.authorZhao, FY-
dc.contributor.authorLi, Y-
dc.contributor.authorWang, HQ-
dc.date.accessioned2019-10-04T08:05:06Z-
dc.date.available2019-10-04T08:05:06Z-
dc.date.issued2018-
dc.identifier.citationJournal of Wind Engineering & Industrial Aerodynamics, 2018, v. 179, p. 449-462-
dc.identifier.issn0167-6105-
dc.identifier.urihttp://hdl.handle.net/10722/277980-
dc.description.abstractThis paper investigates the single-sided wind driven natural ventilation with two apertures on the rear wall, regarding different horizontal aperture separations, magnitudes of incoming wind speed and various side ratios (L/D, length/width). In the present work, CFD simulations are performed with Reynolds-Averaged Navier-Stokes (RANS) approach, and pressure correction linked equation is adopted to provide closure. The simulation results indicate that wind flow behind the rear wall is essentially driven by the pumping mechanism due to vortex shedding, in which wind flow direction alternates at a mean rate. The frequency of the “pumping” flow increases dramatically with the wind flow velocity at a wide range of Reynolds numbers. The decrease of free aperture separation reduces the enclosure flow rate whilst the frequency of the wind flow almost maintains at a constant value. The increase of sidewall length has similar impacts on the ventilation frequency and the dimensionless ventilation flow rate. Numerical investigations further demonstrate that non-dimensional ventilation rate can be promoted by increasing incoming wind velocities when the wind speed is less than 5 m/s. This promotion will be restrained when the wind speed is further increased. The simulation results of built enclosure flow rate, frequency of enclosure flow can be applied to improve the ventilation performance of buildings merely with rear wall openings.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jweia-
dc.relation.ispartofJournal of Wind Engineering & Industrial Aerodynamics-
dc.subjectWind-driven natural ventilation-
dc.subjectSingle-sided fluid flow-
dc.subjectVortex shedding-
dc.subjectNumerical simulations-
dc.titleTwo-dimensional numerical simulation of wind driven ventilation across a building enclosure with two free apertures on the rear side: Vortex shedding and 'pumping flow mechanism'-
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.jweia.2018.07.002-
dc.identifier.scopuseid_2-s2.0-85049471194-
dc.identifier.hkuros306580-
dc.identifier.volume179-
dc.identifier.spage449-
dc.identifier.epage462-
dc.identifier.isiWOS:000441491800036-
dc.publisher.placeNetherlands-
dc.identifier.issnl0167-6105-

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