Large Eddy Simulations Of Convergent-divergent Channel Flows At Moderate Reynolds Numbers

dc.creatorSchiavo
dc.creatorLuiz A. C. A.; Jesus
dc.creatorAntonio B.; Azevedo
dc.creatorJoao L. F.; Wolf
dc.creatorWilliam R.
dc.date2015-DEC
dc.date2016-06-07T13:35:41Z
dc.date2016-06-07T13:35:41Z
dc.date.accessioned2018-03-29T01:51:12Z
dc.date.available2018-03-29T01:51:12Z
dc.identifier
dc.identifierLarge Eddy Simulations Of Convergent-divergent Channel Flows At Moderate Reynolds Numbers. Elsevier Science Inc, v. 56, p. 137-151 DEC-2015.
dc.identifier0142-727X
dc.identifierWOS:000366961900012
dc.identifier10.1016/j.ijheatfluidflow.2015.07.006
dc.identifierhttp://www.sciencedirect.com/science/article/pii/S0142727X15000880
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/244176
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1307874
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionThe paper is focused on the study of fully turbulent channel flows, using Large Eddy Simulations (LES), in order to address the effects of adverse pressure gradient regions. Analyses of the effects of streak instabilities, which have been shown to be relevant in such regions, are extended to moderate Reynolds numbers. The work considers two different channel geometries in order to further separate influences from wall curvature, flow separation and adverse pressure gradients. Turbulent kinetic energy and Reynolds stress budgets are investigated at separation and re-attachment points. The numerical approach used in the present work is based on the incompressible Navier-Stokes equations, which are solved by a pseudo-spectral methodology for structured grids. Wall-resolved LES calculations are performed using the WALE subgrid scale model. The study shows that the streak instability mechanism persists at higher Reynolds numbers with and without wall curvature in the adverse pressure gradient regions. Moreover, the observed effects are also present regardless of the existence of flow separation regions. Finally, the study of turbulent kinetic energy budgets indicates that, independently of the flow condition, there are well-defined patterns for such turbulent properties at separation and re-attachment points. (C) 2015 Elsevier Inc. All rights reserved.
dc.description56
dc.description
dc.description
dc.description137
dc.description151
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.descriptionFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.descriptionCNPq [309985/2013-7, 470695/2013-7]
dc.descriptionFAPESP [2013/03413-4, 2013/07375-0, 2014/07623-6]
dc.description
dc.description
dc.description
dc.languageen
dc.publisherELSEVIER SCIENCE INC
dc.publisher
dc.publisherNEW YORK
dc.relationINTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
dc.rightsembargo
dc.sourceWOS
dc.subjectDirect Numerical-simulation
dc.subjectWall Turbulence
dc.subjectBoundary-layer
dc.subjectGradient
dc.titleLarge Eddy Simulations Of Convergent-divergent Channel Flows At Moderate Reynolds Numbers
dc.typeArtículos de revistas


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