Modified 'closure' constants of the Standard k-ε turbulence model for the prediction of wind-induced natural ventilation

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dc.contributor.author Stavrakakis, GM en
dc.contributor.author Tomazinakis, NM en
dc.contributor.author Markatos, NC en
dc.date.accessioned 2014-03-01T02:11:27Z
dc.date.available 2014-03-01T02:11:27Z
dc.date.issued 2012 en
dc.identifier.issn 01436244 en
dc.identifier.uri http://hdl.handle.net/123456789/29905
dc.subject.other Computer resources en
dc.subject.other Energy reduction en
dc.subject.other Experimental data en
dc.subject.other In-buildings en
dc.subject.other Modified model en
dc.subject.other Natural ventilation en
dc.subject.other Numerical results en
dc.subject.other Pressure coefficients en
dc.subject.other Streamwise velocity en
dc.subject.other Vertical velocity components en
dc.subject.other Wind characteristics en
dc.subject.other Computational fluid dynamics en
dc.subject.other Prandtl number en
dc.subject.other Troposphere en
dc.subject.other Turbulence models en
dc.subject.other Ventilation en
dc.title Modified 'closure' constants of the Standard k-ε turbulence model for the prediction of wind-induced natural ventilation en
heal.type journalArticle en
heal.identifier.primary 10.1177/0143624411407950 en
heal.identifier.secondary http://dx.doi.org/10.1177/0143624411407950 en
heal.publicationDate 2012 en
heal.abstract In this study, wind-driven natural ventilation in buildings is investigated by means of computational fluid dynamics. The airflow in and around three pilot buildings, which correspond to the most common natural-ventilation designs, i.e. cross-, windward- and leeward- single-sided ventilation, is simulated by applying both the Standard and a modified k-ε turbulence model. The latter represents a Prandtl number-modified version of the Standard k-ε model, based on the flow-variable (velocity and turbulence variables) distributions and on the atmospheric boundary layer (ABL) assumptions. Numerical results of streamwise and vertical velocity components, as well as of pressure coefficients at the facades, obtained by both turbulence models are compared with available wind tunnel experimental data found in literature. It is concluded that both models applied are in acceptable agreement with measurements, especially for the mean streamwise velocity component, while the proposed modified model is more accurate as far as flow within the windward and the internal parts (i.e. within the building) of the domain is concerned.Practical application: This study focuses on the development of a modified k-ε turbulence model for the prediction of wind-driven natural ventilation. The analysis described represents a methodology to produce 'closure' parameters, such as Prandtl numbers, compatible with the incoming wind characteristics (ABL). It was found that for all ventilation cases studied, i.e. cross- and single-sided ventilation, the proposed modified model is more accurate compared with the Standard k-ε model, and it accounts for the dumping effect near the walls and for kinetic energy reduction in the impinging region adequately. It is satisfying that the modified k-ε model leads to acceptable engineering results within relatively practical computer resources. © The Chartered Institution of Building Services Engineers 2011. en
heal.journalName Building Services Engineering Research and Technology en
dc.identifier.doi 10.1177/0143624411407950 en
dc.identifier.volume 33 en
dc.identifier.issue 3 en
dc.identifier.spage 241 en
dc.identifier.epage 261 en

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