CROSS-FLOW PAST AN OSCILLATING CIRCULAR CYLINDER: SYNCHRONIZATION PHENOMENA IN THE NEAR WAKE
Identifieur interne : 003255 ( Main/Exploration ); précédent : 003254; suivant : 003256CROSS-FLOW PAST AN OSCILLATING CIRCULAR CYLINDER: SYNCHRONIZATION PHENOMENA IN THE NEAR WAKE
Auteurs : S. Krishnamoorthy ; S. J. Price ; M. P. PaïdoussisSource :
- Journal of Fluids and Structures [ 0889-9746 ] ; 2001.
Abstract
Cross-flow past a circular cylinder in a water tunnel undergoing forced harmonic oscillations in the transverse plane was investigated experimentally at Reynolds numbers ranging from 1250 to 1500, by means of dye visualization of the formation region and measurement of wake spectra. Cylinder oscillation frequencies feranging from 1 3-subharmonic excitation to 3-superharmonic excitation were considered, with the amplitude of oscillation fixed at 0·22 diameters. As feis incremented within the fundamental lock-in regime, the structure of the formation region undergoes two distinct transitions. The first transition, which is accompanied by an abrupt reduction in vortex formation length, corresponds to a switch from the ‘2P’ wake vortex pattern to the ‘2S’ wake vortex pattern of Williamson & Roshko. After a subsequent transition, the phase of vortex shedding relative to cylinder displacement switches by about π. Between the two transitions, the vortex formation length is a minimum. A similar minimum seems to be next attained only when feis increased to achieve 3-superharmonic synchronization. Finally, while for both the 1 3-subharmonic excitation and the 1 2-subharmonic excitation the topology of the formation region is periodic with every cycle of cylinder oscillation, a synchronized wake pattern forms only in the former case.
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DOI: 10.1006/jfls.2001.0382
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Krishnamoorthy</name><affiliation><wicri:noCountry code="subField">2K6</wicri:noCountry></affiliation></author><author><name sortKey="Price, S J" sort="Price, S J" uniqKey="Price S" first="S. J." last="Price">S. J. Price</name><affiliation><wicri:noCountry code="subField">2K6</wicri:noCountry></affiliation></author><author><name sortKey="Paidoussis, M P" sort="Paidoussis, M P" uniqKey="Paidoussis M" first="M. P." last="Païdoussis">M. P. Païdoussis</name><affiliation><wicri:noCountry code="subField">2K6</wicri:noCountry></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Fluids and Structures</title><title level="j" type="abbrev">YJFLS</title><idno type="ISSN">0889-9746</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="2001">2001</date><biblScope unit="volume">15</biblScope><biblScope unit="issue">7</biblScope><biblScope unit="page" from="955">955</biblScope><biblScope unit="page" to="980">980</biblScope></imprint><idno type="ISSN">0889-9746</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0889-9746</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Cross-flow past a circular cylinder in a water tunnel undergoing forced harmonic oscillations in the transverse plane was investigated experimentally at Reynolds numbers ranging from 1250 to 1500, by means of dye visualization of the formation region and measurement of wake spectra. Cylinder oscillation frequencies feranging from 1 3-subharmonic excitation to 3-superharmonic excitation were considered, with the amplitude of oscillation fixed at 0·22 diameters. As feis incremented within the fundamental lock-in regime, the structure of the formation region undergoes two distinct transitions. The first transition, which is accompanied by an abrupt reduction in vortex formation length, corresponds to a switch from the ‘2P’ wake vortex pattern to the ‘2S’ wake vortex pattern of Williamson & Roshko. After a subsequent transition, the phase of vortex shedding relative to cylinder displacement switches by about π. Between the two transitions, the vortex formation length is a minimum. A similar minimum seems to be next attained only when feis increased to achieve 3-superharmonic synchronization. Finally, while for both the 1 3-subharmonic excitation and the 1 2-subharmonic excitation the topology of the formation region is periodic with every cycle of cylinder oscillation, a synchronized wake pattern forms only in the former case.</div></front></TEI><affiliations><list></list><tree><noCountry><name sortKey="Krishnamoorthy, S" sort="Krishnamoorthy, S" uniqKey="Krishnamoorthy S" first="S." last="Krishnamoorthy">S. Krishnamoorthy</name><name sortKey="Paidoussis, M P" sort="Paidoussis, M P" uniqKey="Paidoussis M" first="M. P." last="Païdoussis">M. P. Païdoussis</name><name sortKey="Price, S J" sort="Price, S J" uniqKey="Price S" first="S. J." last="Price">S. J. Price</name></noCountry></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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