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Article: Vortex shedding flow behind a slowly rotating circular cylinder

TitleVortex shedding flow behind a slowly rotating circular cylinder
Authors
KeywordsPiv
Rotating Cylinder
Vortices
Issue Date2009
PublisherAcademic 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?
AbstractThis 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 Identifierhttp://hdl.handle.net/10722/150486
ISSN
2015 Impact Factor: 1.709
2015 SCImago Journal Rankings: 1.282
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Council of Hong KongHKU7006/97E
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 FieldValueLanguage
dc.contributor.authorLam, KMen_US
dc.date.accessioned2012-06-26T06:05:07Z-
dc.date.available2012-06-26T06:05:07Z-
dc.date.issued2009en_US
dc.identifier.citationJournal Of Fluids And Structures, 2009, v. 25 n. 2, p. 245-262en_US
dc.identifier.issn0889-9746en_US
dc.identifier.urihttp://hdl.handle.net/10722/150486-
dc.description.abstractThis 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.languageengen_US
dc.publisherAcademic Press. The Journal's web site is located at http://www.elsevier.com/locate/jfsen_US
dc.relation.ispartofJournal of Fluids and Structuresen_US
dc.subjectPiven_US
dc.subjectRotating Cylinderen_US
dc.subjectVorticesen_US
dc.titleVortex shedding flow behind a slowly rotating circular cylinderen_US
dc.typeArticleen_US
dc.identifier.emailLam, KM:kmlam@hku.hken_US
dc.identifier.authorityLam, KM=rp00134en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.jfluidstructs.2008.04.005en_US
dc.identifier.scopuseid_2-s2.0-61849156365en_US
dc.identifier.hkuros170299-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-61849156365&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume25en_US
dc.identifier.issue2en_US
dc.identifier.spage245en_US
dc.identifier.epage262en_US
dc.identifier.eissn1095-8622-
dc.identifier.isiWOS:000265195800002-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridLam, KM=7403656958en_US

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