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dc.contributor.authorAarnes, Jørgen Røysland
dc.contributor.authorAndersson, Helge Ingolf
dc.contributor.authorHaugen, Nils Erland L
dc.date.accessioned2018-12-18T14:47:39Z
dc.date.available2018-12-18T14:47:39Z
dc.date.created2018-02-20T16:15:38Z
dc.date.issued2018
dc.identifier.citationJournal of turbulence. 2018, 19 (3), 252-273.nb_NO
dc.identifier.issn1468-5248
dc.identifier.urihttp://hdl.handle.net/11250/2578171
dc.description.abstractWe investigate how a turbulent free-stream (TFS) affects the transition-in-wake state of flow past a cylinder. Direct numerical simulations of a decaying TFS flow past a cylinder have been performed, where the intensity and integral scale of the TFS was varied. Distinct effects of the TFS are observed for Reynolds numbers in the lower (Re < 190) and upper (Re ≥ 250) ranges of the transitional regime. For a flow with a laminar free-stream (LFS), the onset of the transition-in-wake is observed at critical Reynolds number 190, where the first three-dimensional effects develop in the wake (mode A instabilities). A TFS perturbs the flow, forcing the onset of the transition at a lower Reynolds number and inhibiting a sharply defined critical Reynolds number. Quasi-stable states, where the wake alternates between two- and three-dimensional vortex shedding, are observed for Re < 190. These states are closely related to intermittent vortex dislocations in the wake. In the upper Re part of the transition-in-wake regime, mode B instabilities dominate the wake of the LFS flow. A TFS stimulates the existence of mode A instabilities, resulting in mixed A–B instabilities in the wake for Re ≥ 250. This effect correlates with the turbulence intensity. © 2018 Informa UK Limited, trading as Taylor & Francis Group.nb_NO
dc.description.abstractNumerical investigation of free-stream turbulence effects on the transition-in-wake state of flow past a circular cylindernb_NO
dc.language.isoengnb_NO
dc.publisherTaylor & Francisnb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.no*
dc.titleNumerical investigation of free-stream turbulence effects on the transition-in-wake state of flow past a circular cylindernb_NO
dc.title.alternativeNumerical investigation of free-stream turbulence effects on the transition-in-wake state of flow past a circular cylindernb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber252-273nb_NO
dc.source.volume19nb_NO
dc.source.journalJournal of turbulencenb_NO
dc.source.issue3nb_NO
dc.identifier.doi10.1080/14685248.2017.1418085
dc.identifier.cristin1567140
dc.relation.projectNorges forskningsråd: 231444nb_NO
cristin.unitcode7548,70,0,0
cristin.unitnameTermisk energi
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
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