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dc.contributor.authorLaskari, Angeliki
dc.contributor.authorde Kat, Roeland
dc.contributor.authorHearst, R. Jason
dc.contributor.authorGanapathisubramani, Bharathram
dc.date.accessioned2019-02-15T08:15:35Z
dc.date.available2019-02-15T08:15:35Z
dc.date.created2018-03-15T12:01:22Z
dc.date.issued2018
dc.identifier.citationJournal of Fluid Mechanics. 2018, 842 554-590.nb_NO
dc.identifier.issn0022-1120
dc.identifier.urihttp://hdl.handle.net/11250/2585590
dc.description.abstractTime-resolved planar particle image velocimetry (PIV) was used to analyse the structuring of a turbulent boundary layer into uniform momentum zones (UMZs). The instantaneous peak detection method employed by Adrian et al. (2000) and de Silva et al. (2016) is extended to account for temporal coherence of UMZs. The resulting number of zones detected appears to follow a normal distribution at any given instant. However, the extreme cases in which the number of zones is either very high or very low, are shown to be linked with two distinct flow states. A higher than average number of zones is associated with a large-scale Q2 event in the log region which creates increased small-scale activity within that region. Conversely, a low number of zones corresponds to a large-scale Q4 event in the log-region and decreased turbulent activity away from the wall. The residence times, within the measurement plane, of zones belonging to the latter scenario are shown to be on average four times larger than those of zones present during higher than average zone structuring states. For both cases, greater residence times are observed for zones of higher momentum that are generally closer to the freestream.nb_NO
dc.language.isoengnb_NO
dc.publisherCambridge University Pressnb_NO
dc.titleTime evolution of uniform moment zones in a turbulent boundary layernb_NO
dc.title.alternativeTime evolution of uniform moment zones in a turbulent boundary layernb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber554-590nb_NO
dc.source.volume842nb_NO
dc.source.journalJournal of Fluid Mechanicsnb_NO
dc.identifier.doi10.1017/jfm.2018.126
dc.identifier.cristin1573089
dc.description.localcode© 2018. This is the authors' accepted and refereed manuscript to the article. The final authenticated version is available online at: https://doi.org/10.1017/jfm.2018.126nb_NO
cristin.unitcode194,64,25,0
cristin.unitnameInstitutt for energi- og prosessteknikk
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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