Vortex structures in the wake of a buoyant tethered cylinder at moderate to high reduced velocities
Identifieur interne : 00AA09 ( Main/Exploration ); précédent : 00AA08; suivant : 00AA10Vortex structures in the wake of a buoyant tethered cylinder at moderate to high reduced velocities
Auteurs : K. Ryan [Australie] ; M. C. Thompson [Australie] ; K. Hourigan [Australie]Source :
- European journal of mechanics. B, Fluids [ 0997-7546 ] ; 2004.
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- Pascal (Inist)
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Abstract
Flow-induced vibration of a tethered body immersed in a uniform flow represents a fundamental example of fluid-structure interaction. However, to date little research in this problem has been undertaken. We present results from a two-dimensional numerical simulation of the flow past a tethered circular cylinder with mass ratio, m* = 0.833. The Navier-Stokes and dynamic equations of motion of the cylinder are solved using a Galerkin spectral-element/Fourier method. The fluid forces acting on the cylinder, as well as the tension in the tether, are computed and used to determine the resulting cylinder motion. A large peak in the cylinder oscillation is noted for a reduced velocity u* ≃ 19 corresponding to a negative maximum in the mean lift and a positive maximum in the RMS drag force. Analysis of the vortex structures in the wake of the cylinder, for the cases of u* = 15.4, 19 and 21, reveal a subtle asymmetry in the shedding process which may provide a mechanism to explain this peak in oscillation amplitude
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Thompson</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical Engineering, Monash University</s1><s2>Clayton, Victoria, 3800</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Clayton, Victoria, 3800</wicri:noRegion></affiliation></author><author><name sortKey="Hourigan, K" sort="Hourigan, K" uniqKey="Hourigan K" first="K." last="Hourigan">K. Hourigan</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical Engineering, Monash University</s1><s2>Clayton, Victoria, 3800</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Clayton, Victoria, 3800</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">04-0130965</idno><date when="2004">2004</date><idno type="stanalyst">PASCAL 04-0130965 INIST</idno><idno type="RBID">Pascal:04-0130965</idno><idno type="wicri:Area/PascalFrancis/Corpus">005026</idno><idno type="wicri:Area/PascalFrancis/Curation">001088</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">004845</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">004845</idno><idno type="wicri:doubleKey">0997-7546:2004:Ryan K:vortex:structures:in</idno><idno type="wicri:Area/Main/Merge">00B672</idno><idno type="wicri:Area/Main/Curation">00AA09</idno><idno type="wicri:Area/Main/Exploration">00AA09</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Vortex structures in the wake of a buoyant tethered cylinder at moderate to high reduced velocities</title><author><name sortKey="Ryan, K" sort="Ryan, K" uniqKey="Ryan K" first="K." last="Ryan">K. Ryan</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical Engineering, Monash University</s1><s2>Clayton, Victoria, 3800</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Clayton, Victoria, 3800</wicri:noRegion></affiliation></author><author><name sortKey="Thompson, M C" sort="Thompson, M C" uniqKey="Thompson M" first="M. C." last="Thompson">M. C. Thompson</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical Engineering, Monash University</s1><s2>Clayton, Victoria, 3800</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Clayton, Victoria, 3800</wicri:noRegion></affiliation></author><author><name sortKey="Hourigan, K" sort="Hourigan, K" uniqKey="Hourigan K" first="K." last="Hourigan">K. Hourigan</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical Engineering, Monash University</s1><s2>Clayton, Victoria, 3800</s2><s3>AUS</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Australie</country><wicri:noRegion>Clayton, Victoria, 3800</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">European journal of mechanics. B, Fluids</title><title level="j" type="abbreviated">Eur. j. mech., B Fluids</title><idno type="ISSN">0997-7546</idno><imprint><date when="2004">2004</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">European journal of mechanics. B, Fluids</title><title level="j" type="abbreviated">Eur. j. mech., B Fluids</title><idno type="ISSN">0997-7546</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Discretization method</term><term>Fluid structure interaction</term><term>Hydroelasticity</term><term>Lift</term><term>Mesh generation</term><term>Numerical simulation</term><term>Oscillating cylinder</term><term>Swirling flow</term><term>Vortex shedding</term><term>Wake</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Interaction fluide structure</term><term>Cylindre oscillant</term><term>Sillage</term><term>Ecoulement tourbillonnaire</term><term>Détachement tourbillonnaire</term><term>Portance</term><term>Méthode discrétisation</term><term>Génération maille</term><term>Simulation numérique</term><term>Hydroélasticité</term><term>4640</term><term>4727V</term><term>4732F</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Flow-induced vibration of a tethered body immersed in a uniform flow represents a fundamental example of fluid-structure interaction. However, to date little research in this problem has been undertaken. We present results from a two-dimensional numerical simulation of the flow past a tethered circular cylinder with mass ratio, m* = 0.833. The Navier-Stokes and dynamic equations of motion of the cylinder are solved using a Galerkin spectral-element/Fourier method. The fluid forces acting on the cylinder, as well as the tension in the tether, are computed and used to determine the resulting cylinder motion. A large peak in the cylinder oscillation is noted for a reduced velocity u<sup>*</sup> ≃ 19 corresponding to a negative maximum in the mean lift and a positive maximum in the RMS drag force. Analysis of the vortex structures in the wake of the cylinder, for the cases of u<sup>*</sup> = 15.4, 19 and 21, reveal a subtle asymmetry in the shedding process which may provide a mechanism to explain this peak in oscillation amplitude</div></front></TEI><affiliations><list><country><li>Australie</li></country></list><tree><country name="Australie"><noRegion><name sortKey="Ryan, K" sort="Ryan, K" uniqKey="Ryan K" first="K." last="Ryan">K. Ryan</name></noRegion><name sortKey="Hourigan, K" sort="Hourigan, K" uniqKey="Hourigan K" first="K." last="Hourigan">K. Hourigan</name><name sortKey="Thompson, M C" sort="Thompson, M C" uniqKey="Thompson M" first="M. C." last="Thompson">M. C. Thompson</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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