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Article: Vortex formation processes from an oscillating circular cylinder at high Keulegan-Carpenter numbers

TitleVortex formation processes from an oscillating circular cylinder at high Keulegan-Carpenter numbers
Authors
KeywordsCylinder oscillations
Half cycle
Keulegan-carpenter number
Mode II
Mode III
Issue Date2010
PublisherAmerican Institute of Physics. The Journal's web site is located at http://ojps.aip.org/phf
Citation
Physics of fluids, 2010, v. 22 n. 1, article no. 015105 How to Cite?
AbstractDevelopment of vortex patterns around a circular cylinder oscillating in quiescent water is investigated using time-resolved particle image velocimetry. Experiments are performed at Keulegan–Carpenter (KC) numbers between 8 and 36 with Reynolds number kept constant at 2400. Similar to previous studies, three modes of vortex patterns are identified and denoted as modes I, II, and III. The development of vortices in each mode at successive phases of cylinder oscillation is studied in details. The classification of modes is based on the development mechanism of shear layers around the cylinder, the number of vortices shed in each half cycle, and the characteristics of the vortex street. Modes I, II, and III are characterized by one, two, and three (or more) vortices generated, respectively, in each half cycle. The appropriate vortex formation length is applied to explain the dependence of number of vortices formed in each cylinder cycle on KC. Vortex shedding in mode I occurs only on one side of the line of cylinder motion. This mode, which occurs at KC between 8 and 16, is observed to have two submodes with different orientations of the vortex street to the line of cylinder motion. Mode II occurs at KC between 16 and 24. The vortex street extends to both sides of the line of cylinder motion and lies at about 45° to it. At KC>24, vortices are shed behind the moving cylinder similar to the case of a towed cylinder. The limited-length vortex street in this mode III pattern lies along the line of cylinder motion. Each vortex pattern is associated with a typical secondary flow stream, which affects distinct evolution stages of vortices around the cylinder and hence the unique vortex pattern. The development of vortices is found to involve complex vortex interaction involving migration, stretching, and splitting.
Persistent Identifierhttp://hdl.handle.net/10722/123840
ISSN
2015 Impact Factor: 2.017
2015 SCImago Journal Rankings: 1.036
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLam, KMen_HK
dc.contributor.authorHu, JCen_HK
dc.contributor.authorLiu, Pen_HK
dc.date.accessioned2010-10-04T07:54:37Z-
dc.date.available2010-10-04T07:54:37Z-
dc.date.issued2010en_HK
dc.identifier.citationPhysics of fluids, 2010, v. 22 n. 1, article no. 015105en_HK
dc.identifier.issn1070-6631en_HK
dc.identifier.urihttp://hdl.handle.net/10722/123840-
dc.description.abstractDevelopment of vortex patterns around a circular cylinder oscillating in quiescent water is investigated using time-resolved particle image velocimetry. Experiments are performed at Keulegan–Carpenter (KC) numbers between 8 and 36 with Reynolds number kept constant at 2400. Similar to previous studies, three modes of vortex patterns are identified and denoted as modes I, II, and III. The development of vortices in each mode at successive phases of cylinder oscillation is studied in details. The classification of modes is based on the development mechanism of shear layers around the cylinder, the number of vortices shed in each half cycle, and the characteristics of the vortex street. Modes I, II, and III are characterized by one, two, and three (or more) vortices generated, respectively, in each half cycle. The appropriate vortex formation length is applied to explain the dependence of number of vortices formed in each cylinder cycle on KC. Vortex shedding in mode I occurs only on one side of the line of cylinder motion. This mode, which occurs at KC between 8 and 16, is observed to have two submodes with different orientations of the vortex street to the line of cylinder motion. Mode II occurs at KC between 16 and 24. The vortex street extends to both sides of the line of cylinder motion and lies at about 45° to it. At KC>24, vortices are shed behind the moving cylinder similar to the case of a towed cylinder. The limited-length vortex street in this mode III pattern lies along the line of cylinder motion. Each vortex pattern is associated with a typical secondary flow stream, which affects distinct evolution stages of vortices around the cylinder and hence the unique vortex pattern. The development of vortices is found to involve complex vortex interaction involving migration, stretching, and splitting.en_HK
dc.languageeng-
dc.publisherAmerican Institute of Physics. The Journal's web site is located at http://ojps.aip.org/phfen_HK
dc.relation.ispartofPhysics of fluidsen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsCopyright (2010) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in (Physics of fluids, 2010, v. 22 n. 1, article no. 015105) and may be found at (http://dx.doi.org/10.1063/1.3291069).-
dc.subjectCylinder oscillations-
dc.subjectHalf cycle-
dc.subjectKeulegan-carpenter number-
dc.subjectMode II-
dc.subjectMode III-
dc.titleVortex formation processes from an oscillating circular cylinder at high Keulegan-Carpenter numbersen_HK
dc.typeArticleen_HK
dc.identifier.emailLam, KM: kmlam@hku.hken_HK
dc.identifier.authorityChan, KH=rp00664en_HK
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1063/1.3291069en_HK
dc.identifier.scopuseid_2-s2.0-84895417097-
dc.identifier.hkuros170296-
dc.identifier.volume22en_HK
dc.identifier.issue1en_HK
dc.identifier.spagearticle no. 015105en_HK
dc.identifier.epagearticle no. 015105en_HK
dc.identifier.isiWOS:000274180800025-
dc.publisher.placeUnited Statesen_HK

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