On grid-generated turbulence in the near- and far field regions

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dc.citation.journalTitleJOURNAL OF FLUID MECHANICS
dc.contributor.authorIsaza, Juan C.
dc.contributor.authorSalazar, Ricardo
dc.contributor.authorWarhaft, Zellman
dc.contributor.researchgroupMecánica Aplicadaspa
dc.date.accessioned2021-04-16T20:10:36Z
dc.date.available2021-04-16T20:10:36Z
dc.date.issued2014-08-01
dc.description.abstractUsing a conventional bi-planar turbulence-generating grid, we confirm the recent findings (Valente & Vassilicos, Phys. Rev. Lett., vol. 108, 2012, art. 214503) that show there is a turbulence decay region close to the generating grid that departs from the 'classical' turbulence decay (Comte-Bellot & Corrsin, J. Fluid Mech., vol. 25, 1966, pp. 657-682). In this 'near-field' region, the turbulence energy decays more rapidly than in the far-field and it exhibits unusual scaling properties. Based on the velocity decay laws, we show that for our conventional grid, the near-field extends from x/M ~ 6 to x/M ~ 12 where x is the downstream distance from the grid and M is the mesh size. This corresponds to 1.1 = x/x* = 2.3 where x* is the wake interaction length scale (Mazellier & Vassilicos, Phys. Fluids, vol. 22, 2010, art. 075101). However, other statistics (velocity derivatives and length-scale ratios) indicate that the extent of the initial period depends on the grid mesh Reynolds number, R<inf>M</inf>, extending further for higher values of R<inf>M</inf>. In the near-field the turbulence approaches isotropy both at the large and small scales but there still is inhomogeneity in the derivative statistics. The derivative skewness also departs from values observed at comparable Reynolds numbers in the far-field decay region, and in other turbulent flows at comparable Reynolds numbers. Two values of R<inf>M</inf> were studied: 42 × 103 and 76 × 103. © 2014 Cambridge University Press.eng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1255
dc.identifier.doi10.1017/jfm.2014.375
dc.identifier.issn14697645
dc.identifier.issn334553spa
dc.identifier.otherWOS;000341118600015
dc.identifier.otherSCOPUS;2-s2.0-84922186887
dc.identifier.urihttp://hdl.handle.net/10784/29165
dc.language.isoengeng
dc.publisherCAMBRIDGE UNIV PRESS
dc.publisher.departmentUniversidad EAFIT. Departamento de Ingeniería Mecánicaspa
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84922186887&doi=10.1017%2fjfm.2014.375&partnerID=40&md5=87fbda2ba9c9c2b9da883b214769b579
dc.rightshttps://v2.sherpa.ac.uk/id/publication/issn/0022-1120
dc.sourceJOURNAL OF FLUID MECHANICS
dc.subject.keywordDecay (organic)eng
dc.subject.keywordReynolds numbereng
dc.subject.keywordDownstream distanceseng
dc.subject.keywordGrid-generated turbulenceeng
dc.subject.keywordIsotropic turbulenceeng
dc.subject.keywordScaling propertieseng
dc.subject.keywordTurbulence energyeng
dc.subject.keywordTurbulence theoryeng
dc.subject.keywordVelocity derivativeseng
dc.subject.keywordWake interactionseng
dc.subject.keywordTurbulenceeng
dc.subject.keywordflow velocityeng
dc.subject.keywordinhomogeneityeng
dc.subject.keywordisotropyeng
dc.subject.keywordReynolds numbereng
dc.subject.keywordtheoretical studyeng
dc.subject.keywordturbulenceeng
dc.subject.keywordturbulent floweng
dc.titleOn grid-generated turbulence in the near- and far field regionseng
dc.typeinfo:eu-repo/semantics/articleeng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

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