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Article: Nonlinear dynamic analysis of natural ventilation in a two-zone building: Part B - CFD simulations

TitleNonlinear dynamic analysis of natural ventilation in a two-zone building: Part B - CFD simulations
Authors
Issue Date2006
Citation
Hvac And R Research, 2006, v. 12 n. 2, p. 257-278 How to Cite?
AbstractComputational fluid dynamics (CFD) is a widely accepted design and analysis tool for building ventilation. This paper presents a simple method using commercial CFD software to obtain the solution multiplicity characteristics of laminar and turbulent indoor airflows. The method is known as the two-way continuation simulation, which has been developed for identifying multiple solutions in computational fluid dynamics. We consider airflows in a simple two-zone building with four openings, where one of the zones has a constant heat source, modeling the heat or pollutant generation and spread in buildings governed by natural stack forces. Using the new two-way continuation simulation method, we describe the flow variation and physical mechanisms at different heights in the two zones for different Rayleigh numbers. The results show that two steady solutions with the same boundary conditions and building geometry can be obtained step-by-step in the simulation process. Flow multiplicity can also be found as the height ratio of the two zones increases or decreases. As an important physical parameter, the Rayleigh number can also have some significant influences on the flow bifurcation or variation. Compared with conventional CFD simulation, the two-way continuation simulation method can effectively identify the possible existence of multiple solutions of indoor airflows and pollutant spread with different initial conditions. One shortcoming of the two-way method is that it cannot identify unstable solutions.
Persistent Identifierhttp://hdl.handle.net/10722/156827
ISSN
2015 Impact Factor: 0.871
References

 

DC FieldValueLanguage
dc.contributor.authorYang, Len_US
dc.contributor.authorLi, Yen_US
dc.contributor.authorXu, Pen_US
dc.contributor.authorZhang, Gen_US
dc.date.accessioned2012-08-08T08:44:07Z-
dc.date.available2012-08-08T08:44:07Z-
dc.date.issued2006en_US
dc.identifier.citationHvac And R Research, 2006, v. 12 n. 2, p. 257-278en_US
dc.identifier.issn1078-9669en_US
dc.identifier.urihttp://hdl.handle.net/10722/156827-
dc.description.abstractComputational fluid dynamics (CFD) is a widely accepted design and analysis tool for building ventilation. This paper presents a simple method using commercial CFD software to obtain the solution multiplicity characteristics of laminar and turbulent indoor airflows. The method is known as the two-way continuation simulation, which has been developed for identifying multiple solutions in computational fluid dynamics. We consider airflows in a simple two-zone building with four openings, where one of the zones has a constant heat source, modeling the heat or pollutant generation and spread in buildings governed by natural stack forces. Using the new two-way continuation simulation method, we describe the flow variation and physical mechanisms at different heights in the two zones for different Rayleigh numbers. The results show that two steady solutions with the same boundary conditions and building geometry can be obtained step-by-step in the simulation process. Flow multiplicity can also be found as the height ratio of the two zones increases or decreases. As an important physical parameter, the Rayleigh number can also have some significant influences on the flow bifurcation or variation. Compared with conventional CFD simulation, the two-way continuation simulation method can effectively identify the possible existence of multiple solutions of indoor airflows and pollutant spread with different initial conditions. One shortcoming of the two-way method is that it cannot identify unstable solutions.en_US
dc.languageengen_US
dc.relation.ispartofHVAC and R Researchen_US
dc.titleNonlinear dynamic analysis of natural ventilation in a two-zone building: Part B - CFD simulationsen_US
dc.typeArticleen_US
dc.identifier.emailLi, Y:liyg@hkucc.hku.hken_US
dc.identifier.authorityLi, Y=rp00151en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-33744468505en_US
dc.identifier.hkuros118209-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-33744468505&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume12en_US
dc.identifier.issue2en_US
dc.identifier.spage257en_US
dc.identifier.epage278en_US
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridYang, L=13806737800en_US
dc.identifier.scopusauthoridLi, Y=7502094052en_US
dc.identifier.scopusauthoridXu, P=8440784800en_US
dc.identifier.scopusauthoridZhang, G=7405270070en_US

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