Detached eddy simulation of shallow mixing layer development between parallel streams

dc.contributor.authorKirkil, Gökhan
dc.date.accessioned2019-06-27T08:02:17Z
dc.date.available2019-06-27T08:02:17Z
dc.date.issued2015
dc.departmentFakülteler, Mühendislik ve Doğa Bilimleri Fakültesi, Endüstri Mühendisliği Bölümüen_US
dc.description.abstractResults of a high resolution Detached Eddy Simulation (DES) are used to characterize the evolution of a shallow mixing layer developing between two parallel streams in a long open channel with a smooth flat bed and medium size dunes. The study discusses the vertical non-uniformity in the mixing layer structure and provides a quantitative characterization of the growth of the large-scale quasi two-dimensional (2D) coherent structures with the distance from the splitter plate. Results show that in streamwise sections situated between 75D (D is the channel depth) and 1501) from the splitter plate the width of the mixing layer close to the free surface is 20-30% more than the width in the near-bed region. This is mostly because of the tilting of the mixing layer interface on the low-speed side toward the low speed stream as the free surface is approached. Power spectra of the horizontal velocity components near the free surface show the presence of a -3 subrange corresponding to inverse energy cascade in two-dimensional turbulence at streamwise locations situated more than 10D from the splitter plate consistent with the presence of large-scale quasi 2D horizontal eddies and the transfer of energy (inverse energy cascade) from the smaller scales toward these eddies. Consistent with visualizations of the mass transport of a passive scalar within the mixing layer close to the free surface the estimated streamwise length of the quasi 2D mixing layer eddies is about 2.5-3.0 times larger than the local width of the mixing layer. The presence of large-scale roughness elements in the form of an array of two-dimensional dunes with a maximum height of 0.25D (D is the channel depth) induces a much more rapid and larger shift of the centerline of the mixing layer due to the increased influence of the bottom roughness. (C) 2014 International Association for Hydro-environment Engineering and Research Asia Pacific Division. Published by Elsevier B.V. All rights reserved.en_US]
dc.identifier.citation3
dc.identifier.doi10.1016/j.jher.2014.10.003en_US
dc.identifier.endpage313
dc.identifier.issn1570-6443en_US
dc.identifier.issn1876-4444en_US
dc.identifier.issn1570-6443
dc.identifier.issn1876-4444
dc.identifier.issue2
dc.identifier.scopus2-s2.0-84930046867en_US
dc.identifier.scopusqualityQ2
dc.identifier.startpage304en_US
dc.identifier.urihttps://hdl.handle.net/20.500.12469/589
dc.identifier.urihttps://doi.org/10.1016/j.jher.2014.10.003
dc.identifier.volume9en_US
dc.identifier.wosWOS:000356554100014en_US
dc.identifier.wosqualityQ2
dc.institutionauthorKirkil, Gökhanen_US
dc.language.isoenen_US
dc.publisherElsevier Science Bven_US
dc.relation.journalJournal Of Hydro-Environment Researchen_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectShallow mixing layersen_US
dc.subjectRiver confluenceen_US
dc.subjectEddy resolving techniquesen_US
dc.titleDetached eddy simulation of shallow mixing layer development between parallel streamsen_US
dc.typeArticleen_US
dspace.entity.typePublication
relation.isAuthorOfPublicationc777ed76-9b8f-43f2-a3b0-0222883181af
relation.isAuthorOfPublication.latestForDiscoveryc777ed76-9b8f-43f2-a3b0-0222883181af

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