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dc.contributor.authorZhu, Jianxun
dc.contributor.authorHolmedal, Lars Erik
dc.contributor.authorMyrhaug, Dag
dc.contributor.authorWang, Hong
dc.date.accessioned2021-01-05T14:23:13Z
dc.date.available2021-01-05T14:23:13Z
dc.date.created2020-09-29T15:52:14Z
dc.date.issued2020
dc.identifier.issn1070-6631
dc.identifier.urihttps://hdl.handle.net/11250/2721560
dc.description.abstractIn this work, the flow over an elliptic cylinder near a moving wall is investigated for Reynolds numbers less than 150. Here, the ratio between the gap (i.e., the distance between the cylinder and the wall) and the length of the semi-major axis of the elliptic cylinder varies from 0.1 to 5. This ratio is hereafter denoted as the gap ratio. The resulting Kármán vortex street, the two-layered wake, and the secondary vortex street have been investigated and visualized. Numerical simulations show that for the steady flow, the wake is composed of two asymmetric recirculation vortices, while a decrease in the gap ratio suppresses the vortex shed from the lower part of the cylinder. For the unsteady flow, the wake can be classified into four different patterns based on the wake structures (the Kármán vortex street, the two-layered wake, and the secondary vortex street). The regions of these wake patterns are given in the gap ratio and Reynolds number space, showing that the critical Reynolds number for the transition between different patterns increases as the gap ratio decreases. An overall increase in the mean drag coefficient with increasing gap ratios is observed, except for a sudden drop that occurs within a small gap ratio range. Moreover, as the gap ratio increases, the onset location of the two-layered wake first decreases due to a decrease in flow velocity in the gap and then increases due to the weakening of the wall suppression effect.en_US
dc.language.isoengen_US
dc.publisherAIPen_US
dc.titleNear-wall effect on flow around an elliptic cylinder translating above a plane wallen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.source.journalPhysics of Fluidsen_US
dc.identifier.doi10.1063/5.0020818
dc.identifier.cristin1835059
dc.description.localcodeLocked until 18.9.2021 due to copyright restrictions. Published by AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Journal of Applied Physics and may be found at https://doi.org/10.1063/5.0020818en_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


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