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dc.contributor.authorAasland, Tale Egeberg
dc.contributor.authorPettersen, Bjørnar
dc.contributor.authorAndersson, Helge Ingolf
dc.contributor.authorJiang, Fengjian
dc.identifier.citationJournal of Fluid Mechanics. 2022, 953 1-31.en_US
dc.description.abstractTandem cylinder flow comprises several different flow regimes. Within the reattachment regime, the development of the gap shear layers is of utmost importance to the flow, but has received little attention so far. Through direct numerical simulations at Re = 104, for a gap ratio of 3.0, we have discovered that the shear layers are significantly altered with respect to a single cylinder. These differences include early onset of separation, crossflow stabilising, delayed transition to turbulence and little meandering of the transition region. Vortex pairing in the gap shear layers is reported for the first time. The interaction between the recirculating gap flow and the shear layers was investigated. Asymmetrical, large-scale gap vortices influence the position of transition to turbulence through direct contact and through secondary flows. The occurrence of transition in the gap shear layers has consequences for both the reattachment mechanism and the development of the downstream cylinder wake. The reattachment points are unsteady with large amplitude fluctuations on a fine time scale. Reattachment is seen to be a combination of impingement and modification of the upstream shear layers, which causes a double shear layer in the downstream cylinder near-wake. Buffeting by and interaction with the gap shear layers likely cause transition to turbulence in the downstream cylinder boundary layer. This leads to significant changes in the wake topology, compared with a single-cylinder wake.en_US
dc.publisherCambridge University Pressen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.subjectvortex sheddingen_US
dc.subjectvortex dynamicsen_US
dc.subjectshear layer turbulenceen_US
dc.titleRevisiting the reattachment regime: a closer look at tandem cylinder flow at Re=10000en_US
dc.title.alternativeRevisiting the reattachment regime: a closer look at tandem cylinder flow at Re=10000en_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holder© The Author(s), 2022. Published by Cambridge University Press. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence ( licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.en_US
dc.source.journalJournal of Fluid Mechanicsen_US

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal