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Vortical patterns behind a tapered cylinder oscillating transversely

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dc.contributor.author Techet, A. H.
dc.contributor.author Hover, F. S.
dc.contributor.author Triantafyllou, M.S.
dc.date.accessioned 2005-08-23T05:51:51Z
dc.date.available 2005-08-23T05:51:51Z
dc.date.issued 1998
dc.identifier.uri http://hdl.handle.net/1721.1/25615
dc.description.abstract Visualization studies of the flow behind an oscillating tapered cylinder are performed at Reynolds numbers from 400 to 1500. The cylinder has taper ratio 40:1 and is moving at constant forward speed U while being forced to oscillate harmonically in the transverse direction. It is shown that within the lock-in region and above a threshold amplitude, no cells form and, instead, a single frequency of response dominates the entire span. Within certain frequency ranges a single mode dominates in the wake, consisting of shedding along the entire span of either two vortices per cycle (`2S' mode), or four vortices per cycle (`2P' mode); but within specific parametric ranges a hybrid mode is observed, consisting of a `2S' pattern along the part of the span with the larger diameter and a `2P' pattern along the part of the span with the smaller diameter. A distinct vortex split connects the two patterns which are phaselocked and have the same frequency. The hybrid mode is periodic, unlike vortex dislocations, and the location of the vortex split remains stable and repeatable, within one to two diameters, depending on the amplitude and frequency of oscillation and the Reynolds number. en
dc.format.extent 1006299 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US en
dc.publisher Cambridge University Press en
dc.rights Copyright: Cambridge University Press This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
dc.subject vorticity en
dc.title Vortical patterns behind a tapered cylinder oscillating transversely en
dc.type Article en
dc.identifier.citation Journal of Fluid Mechanics, 363, p.79-96 (1998) en


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