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Article: Vortex shedding flow behind a slowly rotating circular cylinder
Title | Vortex shedding flow behind a slowly rotating circular cylinder | ||||
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Authors | |||||
Keywords | Piv Rotating Cylinder Vortices | ||||
Issue Date | 2009 | ||||
Publisher | Academic Press. The Journal's web site is located at http://www.elsevier.com/locate/jfs | ||||
Citation | Journal Of Fluids And Structures, 2009, v. 25 n. 2, p. 245-262 How to Cite? | ||||
Abstract | This paper investigates flow past a rotating circular cylinder at 3600≤Re≤5000 and α≤2.5. The flow parameter α is the circumferential speed at the cylinder surface normalized by the free-stream velocity of the uniform cross-flow. With particle image velocimetry (PIV), vortex shedding from the cylinder is clearly observed at α<1.9. The vortex pattern is very similar to the vortex street behind a stationary circular cylinder; but with increasing cylinder rotation speed, the wake is observed to become increasing narrower and deflected sideways. Properties of large-scale vortices developed from the shear layers and shed into the wake are investigated with the vorticity field derived from the PIV data. The vortex formation length is found to decrease with increasing α. This leads to a slow increase in vortex shedding frequency with α. At α=0.65, vortex shedding is found to synchronize with cylinder rotation, with one vortex being shed every rotation cycle of the cylinder. Vortex dynamics are studied at this value of α with the phase-locked eduction technique. It is found that although the shear layers at two different sides of the cylinder possess unequal vorticity levels, alternating vortices subsequently shed from the cylinder to join the two trains of vortices in the vortex street pattern exhibit very little difference in vortex strength. © 2008 Elsevier Ltd. All rights reserved. | ||||
Persistent Identifier | http://hdl.handle.net/10722/150486 | ||||
ISSN | 2023 Impact Factor: 3.4 2023 SCImago Journal Rankings: 1.027 | ||||
ISI Accession Number ID |
Funding Information: This investigation was supported by a research grant awarded by the Research Grants Council of Hong Kong (HKU7006/97E). The writer wishes to thank Miss M.W. Wong for her assistance in the experiments. | ||||
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Lam, KM | en_US |
dc.date.accessioned | 2012-06-26T06:05:07Z | - |
dc.date.available | 2012-06-26T06:05:07Z | - |
dc.date.issued | 2009 | en_US |
dc.identifier.citation | Journal Of Fluids And Structures, 2009, v. 25 n. 2, p. 245-262 | en_US |
dc.identifier.issn | 0889-9746 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/150486 | - |
dc.description.abstract | This paper investigates flow past a rotating circular cylinder at 3600≤Re≤5000 and α≤2.5. The flow parameter α is the circumferential speed at the cylinder surface normalized by the free-stream velocity of the uniform cross-flow. With particle image velocimetry (PIV), vortex shedding from the cylinder is clearly observed at α<1.9. The vortex pattern is very similar to the vortex street behind a stationary circular cylinder; but with increasing cylinder rotation speed, the wake is observed to become increasing narrower and deflected sideways. Properties of large-scale vortices developed from the shear layers and shed into the wake are investigated with the vorticity field derived from the PIV data. The vortex formation length is found to decrease with increasing α. This leads to a slow increase in vortex shedding frequency with α. At α=0.65, vortex shedding is found to synchronize with cylinder rotation, with one vortex being shed every rotation cycle of the cylinder. Vortex dynamics are studied at this value of α with the phase-locked eduction technique. It is found that although the shear layers at two different sides of the cylinder possess unequal vorticity levels, alternating vortices subsequently shed from the cylinder to join the two trains of vortices in the vortex street pattern exhibit very little difference in vortex strength. © 2008 Elsevier Ltd. All rights reserved. | en_US |
dc.language | eng | en_US |
dc.publisher | Academic Press. The Journal's web site is located at http://www.elsevier.com/locate/jfs | en_US |
dc.relation.ispartof | Journal of Fluids and Structures | en_US |
dc.subject | Piv | en_US |
dc.subject | Rotating Cylinder | en_US |
dc.subject | Vortices | en_US |
dc.title | Vortex shedding flow behind a slowly rotating circular cylinder | en_US |
dc.type | Article | en_US |
dc.identifier.email | Lam, KM:kmlam@hku.hk | en_US |
dc.identifier.authority | Lam, KM=rp00134 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1016/j.jfluidstructs.2008.04.005 | en_US |
dc.identifier.scopus | eid_2-s2.0-61849156365 | en_US |
dc.identifier.hkuros | 170299 | - |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-61849156365&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 25 | en_US |
dc.identifier.issue | 2 | en_US |
dc.identifier.spage | 245 | en_US |
dc.identifier.epage | 262 | en_US |
dc.identifier.eissn | 1095-8622 | - |
dc.identifier.isi | WOS:000265195800002 | - |
dc.publisher.place | United Kingdom | en_US |
dc.identifier.scopusauthorid | Lam, KM=7403656958 | en_US |
dc.identifier.issnl | 0889-9746 | - |