Flow over a cylinder subjected to combined translational and rotational oscillations
Identifieur interne :
001112 ( PascalFrancis/Corpus );
précédent :
001111;
suivant :
001113
Flow over a cylinder subjected to combined translational and rotational oscillations
Auteurs : Mehdi Nazarinia ;
David Lo Jacono ;
Mark C. Thompson ;
John SheridanSource :
-
Journal of fluids and structures [ 0889-9746 ] ; 2012.
RBID : Pascal:12-0330614
Descripteurs français
- Pascal (Inist)
- Ecoulement turbulent,
Vorticité,
Ecoulement tourbillonnaire,
Sillage proche,
Déphasage,
Fréquence propre,
Détachement tourbillonnaire,
Résonance,
Transition phase,
Corps arête vive,
Cylindre circulaire,
Système tournant,
Synchronisation,
Champ proche,
Phase multiple,
Etude expérimentale,
.,
Vélocimétrie image particule.
English descriptors
- KwdEn :
- Bluff body,
Circular cylinder,
Eigenfrequency,
Experimental study,
Multiple phase,
Near field,
Near wake,
Particle image velocimetry,
Phase shift,
Phase transitions,
Resonance,
Rotating system,
Synchronization,
Turbulent flow,
Vortex flow,
Vortex shedding,
Vorticity.
Abstract
The experimental research reported here employs particle image velocimetry to extend the study of Nazarinia et al. (2009a), recording detailed vorticity fields in the near-wake of a circular cylinder undergoing combined translational and rotational oscillatory motions. The focus of the present study is to examine the effect of the ratio between the cross-stream translational and rotational velocities and frequencies on the synchronization of the near-wake structures for multiple phase differences between the two motions. The frequencies are fixed close to that of the natural frequency of vortex shedding. The results are presented for a fixed amplitude of rotational oscillation of 1 rad and a range of ratios between the translational and rotational velocities (VR) = [0.25, 0.5, 1.0, 1.5] and for a rang of frequency ratios (FR) = [0.5, 1.0,2.0]. In particular, it was found that varying the VR value changed the near-wake structure. The results show that at the lower value of VR = 0.25, for all of the phase differences examined, the vortices are shed in a single-row 2S mode aligned in the medial plane with a slight offset from the centreline and also synchronized with the combined oscillatory motion. As VR increases the vortex shedding mode changes from a 2S single-row to a 2S double-row structure and eventually back to the single-row (at VR = 0.5). Increasing VR further resulted in the loss of lock-on over the range of negative phase angles and a transition from the 2S to P+S mode for the in-phase case. There was transition back to the 2S wake mode with a further decrease in ϕ. For higher VR the range of desynchronization increased. In the second and third parts of this paper it is shown that the occurrence of unlocked wake flow as the phase angle is varied is greater when the frequency ratio between the imposed oscillatory motions and the natural vortex shedding frequency FRN is higher than unity. The vortices are synchronized in the near-wake at FRN values less than unity and unlocked when FRN > 1.0. In particular, the near-wake structures have also been shown to be synchronized for FR = 0.5 and unlocked for FR = 2.0.
Notice en format standard (ISO 2709)
Pour connaître la documentation sur le format Inist Standard.
| pA |
| A01 | 01 | 1 | | @0 0889-9746 |
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| A02 | 01 | | | @0 JFSTEF |
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| A03 | | 1 | | @0 J. fluids struct. |
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| A05 | | | | @2 32 |
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| A08 | 01 | 1 | ENG | @1 Flow over a cylinder subjected to combined translational and rotational oscillations |
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| A09 | 01 | 1 | ENG | @1 The 7th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, and Flow-Induced Vibrations & Noise |
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| A11 | 01 | 1 | | @1 NAZARINIA (Mehdi) |
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| A11 | 02 | 1 | | @1 LO JACONO (David) |
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| A11 | 03 | 1 | | @1 THOMPSON (Mark C.) |
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| A11 | 04 | 1 | | @1 SHERIDAN (John) |
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| A12 | 01 | 1 | | @1 DALTON (Charles) @9 ed. |
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| A12 | 02 | 1 | | @1 DE LANGRE (Emmanuel) @9 ed. |
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| A14 | 01 | | | @1 Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering, Monash University, P.O. Box 31 @2 Melbourne, Victoria 3800 @3 AUS @Z 1 aut. @Z 2 aut. @Z 3 aut. @Z 4 aut. |
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| A14 | 02 | | | @1 Université de Toulouse; INPT, UPS; IMFT (Institut de Mecanique des Fluides de Toulouse); Allée Camille Soula @2 31400, Toulouse @3 FRA @Z 2 aut. |
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| A14 | 03 | | | @1 CNRS; IMFT @2 31400 Toulouse @3 FRA @Z 2 aut. |
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| A15 | 01 | | | @1 Department of Mechanical Engineering, University of Houston @2 Houston, TX 77204-4006 @3 USA @Z 1 aut. |
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| A15 | 02 | | | @1 Hydrodynamics Laboratory - LadHyx, Ecole Polytechnique @2 91128 Palaiseau @3 FRA @Z 2 aut. |
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| A20 | | | | @1 135-145 |
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| A21 | | | | @1 2012 |
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| A23 | 01 | | | @0 ENG |
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| A43 | 01 | | | @1 INIST @2 21394 @5 354000500824610100 |
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| A44 | | | | @0 0000 @1 © 2012 INIST-CNRS. All rights reserved. |
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| A45 | | | | @0 3/4 p. |
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| A47 | 01 | 1 | | @0 12-0330614 |
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| A60 | | | | @1 P @2 C |
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| A61 | | | | @0 A |
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| A64 | 01 | 1 | | @0 Journal of fluids and structures |
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| A66 | 01 | | | @0 GBR |
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| C01 | 01 | | ENG | @0 The experimental research reported here employs particle image velocimetry to extend the study of Nazarinia et al. (2009a), recording detailed vorticity fields in the near-wake of a circular cylinder undergoing combined translational and rotational oscillatory motions. The focus of the present study is to examine the effect of the ratio between the cross-stream translational and rotational velocities and frequencies on the synchronization of the near-wake structures for multiple phase differences between the two motions. The frequencies are fixed close to that of the natural frequency of vortex shedding. The results are presented for a fixed amplitude of rotational oscillation of 1 rad and a range of ratios between the translational and rotational velocities (VR) = [0.25, 0.5, 1.0, 1.5] and for a rang of frequency ratios (FR) = [0.5, 1.0,2.0]. In particular, it was found that varying the VR value changed the near-wake structure. The results show that at the lower value of VR = 0.25, for all of the phase differences examined, the vortices are shed in a single-row 2S mode aligned in the medial plane with a slight offset from the centreline and also synchronized with the combined oscillatory motion. As VR increases the vortex shedding mode changes from a 2S single-row to a 2S double-row structure and eventually back to the single-row (at VR = 0.5). Increasing VR further resulted in the loss of lock-on over the range of negative phase angles and a transition from the 2S to P+S mode for the in-phase case. There was transition back to the 2S wake mode with a further decrease in ϕ. For higher VR the range of desynchronization increased. In the second and third parts of this paper it is shown that the occurrence of unlocked wake flow as the phase angle is varied is greater when the frequency ratio between the imposed oscillatory motions and the natural vortex shedding frequency FRN is higher than unity. The vortices are synchronized in the near-wake at FRN values less than unity and unlocked when FRN > 1.0. In particular, the near-wake structures have also been shown to be synchronized for FR = 0.5 and unlocked for FR = 2.0. |
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| C02 | 01 | 3 | | @0 001B40G27V |
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| C02 | 02 | 3 | | @0 001B40G32F |
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| C03 | 01 | 3 | FRE | @0 Ecoulement turbulent @5 06 |
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| C03 | 01 | 3 | ENG | @0 Turbulent flow @5 06 |
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| C03 | 02 | 3 | FRE | @0 Vorticité @5 07 |
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| C03 | 02 | 3 | ENG | @0 Vorticity @5 07 |
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| C03 | 03 | 3 | FRE | @0 Ecoulement tourbillonnaire @5 08 |
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| C03 | 03 | 3 | ENG | @0 Vortex flow @5 08 |
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| C03 | 04 | X | FRE | @0 Sillage proche @5 09 |
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| C03 | 04 | X | ENG | @0 Near wake @5 09 |
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| C03 | 04 | X | SPA | @0 Estela próxima @5 09 |
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| C03 | 05 | 3 | FRE | @0 Déphasage @5 10 |
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| C03 | 05 | 3 | ENG | @0 Phase shift @5 10 |
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| C03 | 06 | 3 | FRE | @0 Fréquence propre @5 11 |
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| C03 | 06 | 3 | ENG | @0 Eigenfrequency @5 11 |
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| C03 | 07 | X | FRE | @0 Détachement tourbillonnaire @5 12 |
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| C03 | 07 | X | ENG | @0 Vortex shedding @5 12 |
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| C03 | 07 | X | SPA | @0 Desprendimiento vorticial @5 12 |
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| C03 | 08 | 3 | FRE | @0 Résonance @5 13 |
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| C03 | 08 | 3 | ENG | @0 Resonance @5 13 |
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| C03 | 11 | X | ENG | @0 Circular cylinder @5 16 |
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| C03 | 11 | X | SPA | @0 Cilindro circular @5 16 |
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| C03 | 12 | X | FRE | @0 Système tournant @5 17 |
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| C03 | 12 | X | ENG | @0 Rotating system @5 17 |
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| C03 | 12 | X | SPA | @0 Sistema giratorio @5 17 |
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| C03 | 13 | 3 | FRE | @0 Synchronisation @5 18 |
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| C03 | 13 | 3 | ENG | @0 Synchronization @5 18 |
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| C03 | 14 | X | FRE | @0 Champ proche @5 23 |
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| C03 | 14 | X | ENG | @0 Near field @5 23 |
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| C03 | 14 | X | SPA | @0 Campo próximo @5 23 |
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| C03 | 15 | X | FRE | @0 Phase multiple @5 24 |
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| C03 | 15 | X | ENG | @0 Multiple phase @5 24 |
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| C03 | 15 | X | SPA | @0 Fase múltiple @5 24 |
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| C03 | 16 | 3 | FRE | @0 Etude expérimentale @5 33 |
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| C03 | 16 | 3 | ENG | @0 Experimental study @5 33 |
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| C03 | 17 | 3 | FRE | @0 . @4 INC @5 82 |
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| C03 | 18 | 3 | FRE | @0 Vélocimétrie image particule @4 CD @5 96 |
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| C03 | 18 | 3 | ENG | @0 Particle image velocimetry @4 CD @5 96 |
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| C03 | 18 | 3 | SPA | @0 Velocímetro por imagen de partículas @4 CD @5 96 |
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| N21 | | | | @1 254 |
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| N44 | 01 | | | @1 OTO |
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| N82 | | | | @1 OTO |
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| pR |
| A30 | 01 | 1 | ENG | @1 International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, and Flow-Induced Vibrations & Noise @2 7 @3 Montreal CAN @4 2010-08-01 |
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|
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Format Inist (serveur)
| NO : | PASCAL 12-0330614 INIST |
|---|
| ET : | Flow over a cylinder subjected to combined translational and rotational oscillations |
|---|
| AU : | NAZARINIA (Mehdi); LO JACONO (David); THOMPSON (Mark C.); SHERIDAN (John); DALTON (Charles); DE LANGRE (Emmanuel) |
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| AF : | Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering, Monash University, P.O. Box 31/Melbourne, Victoria 3800/Australie (1 aut., 2 aut., 3 aut., 4 aut.); Université de Toulouse; INPT, UPS; IMFT (Institut de Mecanique des Fluides de Toulouse); Allée Camille Soula/31400, Toulouse/France (2 aut.); CNRS; IMFT/31400 Toulouse/France (2 aut.); Department of Mechanical Engineering, University of Houston/Houston, TX 77204-4006/Etats-Unis (1 aut.); Hydrodynamics Laboratory - LadHyx, Ecole Polytechnique/91128 Palaiseau/France (2 aut.) |
|---|
| DT : | Publication en série; Congrès; Niveau analytique |
|---|
| SO : | Journal of fluids and structures; ISSN 0889-9746; Coden JFSTEF; Royaume-Uni; Da. 2012; Vol. 32; Pp. 135-145; Bibl. 3/4 p. |
|---|
| LA : | Anglais |
|---|
| EA : | The experimental research reported here employs particle image velocimetry to extend the study of Nazarinia et al. (2009a), recording detailed vorticity fields in the near-wake of a circular cylinder undergoing combined translational and rotational oscillatory motions. The focus of the present study is to examine the effect of the ratio between the cross-stream translational and rotational velocities and frequencies on the synchronization of the near-wake structures for multiple phase differences between the two motions. The frequencies are fixed close to that of the natural frequency of vortex shedding. The results are presented for a fixed amplitude of rotational oscillation of 1 rad and a range of ratios between the translational and rotational velocities (VR) = [0.25, 0.5, 1.0, 1.5] and for a rang of frequency ratios (FR) = [0.5, 1.0,2.0]. In particular, it was found that varying the VR value changed the near-wake structure. The results show that at the lower value of VR = 0.25, for all of the phase differences examined, the vortices are shed in a single-row 2S mode aligned in the medial plane with a slight offset from the centreline and also synchronized with the combined oscillatory motion. As VR increases the vortex shedding mode changes from a 2S single-row to a 2S double-row structure and eventually back to the single-row (at VR = 0.5). Increasing VR further resulted in the loss of lock-on over the range of negative phase angles and a transition from the 2S to P+S mode for the in-phase case. There was transition back to the 2S wake mode with a further decrease in ϕ. For higher VR the range of desynchronization increased. In the second and third parts of this paper it is shown that the occurrence of unlocked wake flow as the phase angle is varied is greater when the frequency ratio between the imposed oscillatory motions and the natural vortex shedding frequency FRN is higher than unity. The vortices are synchronized in the near-wake at FRN values less than unity and unlocked when FRN > 1.0. In particular, the near-wake structures have also been shown to be synchronized for FR = 0.5 and unlocked for FR = 2.0. |
|---|
| CC : | 001B40G27V; 001B40G32F |
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| FD : | Ecoulement turbulent; Vorticité; Ecoulement tourbillonnaire; Sillage proche; Déphasage; Fréquence propre; Détachement tourbillonnaire; Résonance; Transition phase; Corps arête vive; Cylindre circulaire; Système tournant; Synchronisation; Champ proche; Phase multiple; Etude expérimentale; .; Vélocimétrie image particule |
|---|
| ED : | Turbulent flow; Vorticity; Vortex flow; Near wake; Phase shift; Eigenfrequency; Vortex shedding; Resonance; Phase transitions; Bluff body; Circular cylinder; Rotating system; Synchronization; Near field; Multiple phase; Experimental study; Particle image velocimetry |
|---|
| SD : | Estela próxima; Desprendimiento vorticial; Transición fase; Cuerpo arista viva; Cilindro circular; Sistema giratorio; Campo próximo; Fase múltiple; Velocímetro por imagen de partículas |
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| LO : | INIST-21394.354000500824610100 |
|---|
| ID : | 12-0330614 |
|---|
Links to Exploration step
Pascal:12-0330614
Le document en format XML
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</publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Flow over a cylinder subjected to combined translational and rotational oscillations</title>
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</inist:fA14><series><title level="j" type="main">Journal of fluids and structures</title>
<title level="j" type="abbreviated">J. fluids struct.</title>
<idno type="ISSN">0889-9746</idno>
<imprint><date when="2012">2012</date>
</imprint><seriesStmt><title level="j" type="main">Journal of fluids and structures</title>
<title level="j" type="abbreviated">J. fluids struct.</title>
<idno type="ISSN">0889-9746</idno>
</seriesStmt><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Bluff body</term>
<term>Circular cylinder</term>
<term>Eigenfrequency</term>
<term>Experimental study</term>
<term>Multiple phase</term>
<term>Near field</term>
<term>Near wake</term>
<term>Particle image velocimetry</term>
<term>Phase shift</term>
<term>Phase transitions</term>
<term>Resonance</term>
<term>Rotating system</term>
<term>Synchronization</term>
<term>Turbulent flow</term>
<term>Vortex flow</term>
<term>Vortex shedding</term>
<term>Vorticity</term>
</keywords><keywords scheme="Pascal" xml:lang="fr"><term>Ecoulement turbulent</term>
<term>Vorticité</term>
<term>Ecoulement tourbillonnaire</term>
<term>Sillage proche</term>
<term>Déphasage</term>
<term>Fréquence propre</term>
<term>Détachement tourbillonnaire</term>
<term>Résonance</term>
<term>Transition phase</term>
<term>Corps arête vive</term>
<term>Cylindre circulaire</term>
<term>Système tournant</term>
<term>Synchronisation</term>
<term>Champ proche</term>
<term>Phase multiple</term>
<term>Etude expérimentale</term>
<term>.</term>
<term>Vélocimétrie image particule</term>
</keywords><front><div type="abstract" xml:lang="en">The experimental research reported here employs particle image velocimetry to extend the study of Nazarinia et al. (2009a), recording detailed vorticity fields in the near-wake of a circular cylinder undergoing combined translational and rotational oscillatory motions. The focus of the present study is to examine the effect of the ratio between the cross-stream translational and rotational velocities and frequencies on the synchronization of the near-wake structures for multiple phase differences between the two motions. The frequencies are fixed close to that of the natural frequency of vortex shedding. The results are presented for a fixed amplitude of rotational oscillation of 1 rad and a range of ratios between the translational and rotational velocities (V<sub>R</sub>
) = [0.25, 0.5, 1.0, 1.5] and for a rang of frequency ratios (F<sub>R</sub>
) <sub>=</sub>
[0.5, 1.0,2.0]. In particular, it was found that varying the V<sub>R</sub>
value changed the near-wake structure. The results show that at the lower value of V<sub>R</sub>
= 0.25, for all of the phase differences examined, the vortices are shed in a single-row 2S mode aligned in the medial plane with a slight offset from the centreline and also synchronized with the combined oscillatory motion. As V<sub>R</sub>
increases the vortex shedding mode changes from a 2S single-row to a 2S double-row structure and eventually back to the single-row (at V<sub>R</sub>
= 0.5). Increasing V<sub>R</sub>
further resulted in the loss of lock-on over the range of negative phase angles and a transition from the 2S to P+S mode for the in-phase case. There was transition back to the 2S wake mode with a further decrease in ϕ. For higher V<sub>R</sub>
the range of desynchronization increased. In the second and third parts of this paper it is shown that the occurrence of unlocked wake flow as the phase angle is varied is greater when the frequency ratio between the imposed oscillatory motions and the natural vortex shedding frequency F<sub>RN</sub>
is higher than unity. The vortices are synchronized in the near-wake at F<sub>RN</sub>
values less than unity and unlocked when F<sub>RN</sub>
> 1.0. In particular, the near-wake structures have also been shown to be synchronized for F<sub>R</sub>
= 0.5 and unlocked for F<sub>R</sub>
= 2.0.</div><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0889-9746</s0>
</fA01><fA02 i1="01"><s0>JFSTEF</s0>
</fA02><fA03 i2="1"><s0>J. fluids struct.</s0>
</fA03><fA08 i1="01" i2="1" l="ENG"><s1>Flow over a cylinder subjected to combined translational and rotational oscillations</s1>
</fA08><fA09 i1="01" i2="1" l="ENG"><s1>The 7th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, and Flow-Induced Vibrations & Noise</s1>
</fA09><fA11 i1="01" i2="1"><s1>NAZARINIA (Mehdi)</s1>
</fA11><fA11 i1="02" i2="1"><s1>LO JACONO (David)</s1>
</fA11><fA11 i1="03" i2="1"><s1>THOMPSON (Mark C.)</s1>
</fA11><fA11 i1="04" i2="1"><s1>SHERIDAN (John)</s1>
</fA11><fA12 i1="01" i2="1"><s1>DALTON (Charles)</s1>
<s9>ed.</s9>
</fA12><fA12 i1="02" i2="1"><s1>DE LANGRE (Emmanuel)</s1>
<s9>ed.</s9>
</fA12><fA14 i1="01"><s1>Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering, Monash University, P.O. Box 31</s1>
<s2>Melbourne, Victoria 3800</s2>
<s3>AUS</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>4 aut.</sZ>
</fA14><fA14 i1="02"><s1>Université de Toulouse; INPT, UPS; IMFT (Institut de Mecanique des Fluides de Toulouse); Allée Camille Soula</s1>
<s2>31400, Toulouse</s2>
<s3>FRA</s3>
<sZ>2 aut.</sZ>
</fA14><fA14 i1="03"><s1>CNRS; IMFT</s1>
<s2>31400 Toulouse</s2>
<s3>FRA</s3>
<sZ>2 aut.</sZ>
</fA14><fA15 i1="01"><s1>Department of Mechanical Engineering, University of Houston</s1>
<s2>Houston, TX 77204-4006</s2>
<s3>USA</s3>
<sZ>1 aut.</sZ>
</fA15><fA15 i1="02"><s1>Hydrodynamics Laboratory - LadHyx, Ecole Polytechnique</s1>
<s2>91128 Palaiseau</s2>
<s3>FRA</s3>
<sZ>2 aut.</sZ>
</fA15><fA20><s1>135-145</s1>
</fA20><fA21><s1>2012</s1>
</fA21><fA23 i1="01"><s0>ENG</s0>
</fA23><fA43 i1="01"><s1>INIST</s1>
<s2>21394</s2>
<s5>354000500824610100</s5>
</fA43><fA44><s0>0000</s0>
<s1>© 2012 INIST-CNRS. All rights reserved.</s1>
</fA44><fA45><s0>3/4 p.</s0>
</fA45><fA47 i1="01" i2="1"><s0>12-0330614</s0>
</fA47><fA60><s1>P</s1>
<s2>C</s2>
</fA60><fA64 i1="01" i2="1"><s0>Journal of fluids and structures</s0>
</fA64><fA66 i1="01"><s0>GBR</s0>
</fA66><fC01 i1="01" l="ENG"><s0>The experimental research reported here employs particle image velocimetry to extend the study of Nazarinia et al. (2009a), recording detailed vorticity fields in the near-wake of a circular cylinder undergoing combined translational and rotational oscillatory motions. The focus of the present study is to examine the effect of the ratio between the cross-stream translational and rotational velocities and frequencies on the synchronization of the near-wake structures for multiple phase differences between the two motions. The frequencies are fixed close to that of the natural frequency of vortex shedding. The results are presented for a fixed amplitude of rotational oscillation of 1 rad and a range of ratios between the translational and rotational velocities (V<sub>R</sub>
) = [0.25, 0.5, 1.0, 1.5] and for a rang of frequency ratios (F<sub>R</sub>
) <sub>=</sub>
[0.5, 1.0,2.0]. In particular, it was found that varying the V<sub>R</sub>
value changed the near-wake structure. The results show that at the lower value of V<sub>R</sub>
= 0.25, for all of the phase differences examined, the vortices are shed in a single-row 2S mode aligned in the medial plane with a slight offset from the centreline and also synchronized with the combined oscillatory motion. As V<sub>R</sub>
increases the vortex shedding mode changes from a 2S single-row to a 2S double-row structure and eventually back to the single-row (at V<sub>R</sub>
= 0.5). Increasing V<sub>R</sub>
further resulted in the loss of lock-on over the range of negative phase angles and a transition from the 2S to P+S mode for the in-phase case. There was transition back to the 2S wake mode with a further decrease in ϕ. For higher V<sub>R</sub>
the range of desynchronization increased. In the second and third parts of this paper it is shown that the occurrence of unlocked wake flow as the phase angle is varied is greater when the frequency ratio between the imposed oscillatory motions and the natural vortex shedding frequency F<sub>RN</sub>
is higher than unity. The vortices are synchronized in the near-wake at F<sub>RN</sub>
values less than unity and unlocked when F<sub>RN</sub>
> 1.0. In particular, the near-wake structures have also been shown to be synchronized for F<sub>R</sub>
= 0.5 and unlocked for F<sub>R</sub>
= 2.0.</s0><fC02 i1="01" i2="3"><s0>001B40G27V</s0>
</fC02><fC02 i1="02" i2="3"><s0>001B40G32F</s0>
</fC02><fC03 i1="01" i2="3" l="FRE"><s0>Ecoulement turbulent</s0>
<s5>06</s5>
</fC03><fC03 i1="01" i2="3" l="ENG"><s0>Turbulent flow</s0>
<s5>06</s5>
</fC03><fC03 i1="02" i2="3" l="FRE"><s0>Vorticité</s0>
<s5>07</s5>
</fC03><fC03 i1="02" i2="3" l="ENG"><s0>Vorticity</s0>
<s5>07</s5>
</fC03><fC03 i1="03" i2="3" l="FRE"><s0>Ecoulement tourbillonnaire</s0>
<s5>08</s5>
</fC03><fC03 i1="03" i2="3" l="ENG"><s0>Vortex flow</s0>
<s5>08</s5>
</fC03><fC03 i1="04" i2="X" l="FRE"><s0>Sillage proche</s0>
<s5>09</s5>
</fC03><fC03 i1="04" i2="X" l="ENG"><s0>Near wake</s0>
<s5>09</s5>
</fC03><fC03 i1="04" i2="X" l="SPA"><s0>Estela próxima</s0>
<s5>09</s5>
</fC03><fC03 i1="05" i2="3" l="FRE"><s0>Déphasage</s0>
<s5>10</s5>
</fC03><fC03 i1="05" i2="3" l="ENG"><s0>Phase shift</s0>
<s5>10</s5>
</fC03><fC03 i1="06" i2="3" l="FRE"><s0>Fréquence propre</s0>
<s5>11</s5>
</fC03><fC03 i1="06" i2="3" l="ENG"><s0>Eigenfrequency</s0>
<s5>11</s5>
</fC03><fC03 i1="07" i2="X" l="FRE"><s0>Détachement tourbillonnaire</s0>
<s5>12</s5>
</fC03><fC03 i1="07" i2="X" l="ENG"><s0>Vortex shedding</s0>
<s5>12</s5>
</fC03><fC03 i1="07" i2="X" l="SPA"><s0>Desprendimiento vorticial</s0>
<s5>12</s5>
</fC03><fC03 i1="08" i2="3" l="FRE"><s0>Résonance</s0>
<s5>13</s5>
</fC03><fC03 i1="08" i2="3" l="ENG"><s0>Resonance</s0>
<s5>13</s5>
</fC03><fC03 i1="09" i2="X" l="FRE"><s0>Transition phase</s0>
<s5>14</s5>
</fC03><fC03 i1="09" i2="X" l="ENG"><s0>Phase transitions</s0>
<s5>14</s5>
</fC03><fC03 i1="09" i2="X" l="SPA"><s0>Transición fase</s0>
<s5>14</s5>
</fC03><fC03 i1="10" i2="X" l="FRE"><s0>Corps arête vive</s0>
<s5>15</s5>
</fC03><fC03 i1="10" i2="X" l="ENG"><s0>Bluff body</s0>
<s5>15</s5>
</fC03><fC03 i1="10" i2="X" l="SPA"><s0>Cuerpo arista viva</s0>
<s5>15</s5>
</fC03><fC03 i1="11" i2="X" l="FRE"><s0>Cylindre circulaire</s0>
<s5>16</s5>
</fC03><fC03 i1="11" i2="X" l="ENG"><s0>Circular cylinder</s0>
<s5>16</s5>
</fC03><fC03 i1="11" i2="X" l="SPA"><s0>Cilindro circular</s0>
<s5>16</s5>
</fC03><fC03 i1="12" i2="X" l="FRE"><s0>Système tournant</s0>
<s5>17</s5>
</fC03><fC03 i1="12" i2="X" l="ENG"><s0>Rotating system</s0>
<s5>17</s5>
</fC03><fC03 i1="12" i2="X" l="SPA"><s0>Sistema giratorio</s0>
<s5>17</s5>
</fC03><fC03 i1="13" i2="3" l="FRE"><s0>Synchronisation</s0>
<s5>18</s5>
</fC03><fC03 i1="13" i2="3" l="ENG"><s0>Synchronization</s0>
<s5>18</s5>
</fC03><fC03 i1="14" i2="X" l="FRE"><s0>Champ proche</s0>
<s5>23</s5>
</fC03><fC03 i1="14" i2="X" l="ENG"><s0>Near field</s0>
<s5>23</s5>
</fC03><fC03 i1="14" i2="X" l="SPA"><s0>Campo próximo</s0>
<s5>23</s5>
</fC03><fC03 i1="15" i2="X" l="FRE"><s0>Phase multiple</s0>
<s5>24</s5>
</fC03><fC03 i1="15" i2="X" l="ENG"><s0>Multiple phase</s0>
<s5>24</s5>
</fC03><fC03 i1="15" i2="X" l="SPA"><s0>Fase múltiple</s0>
<s5>24</s5>
</fC03><fC03 i1="16" i2="3" l="FRE"><s0>Etude expérimentale</s0>
<s5>33</s5>
</fC03><fC03 i1="16" i2="3" l="ENG"><s0>Experimental study</s0>
<s5>33</s5>
</fC03><fC03 i1="17" i2="3" l="FRE"><s0>.</s0>
<s4>INC</s4>
<s5>82</s5>
</fC03><fC03 i1="18" i2="3" l="FRE"><s0>Vélocimétrie image particule</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03><fC03 i1="18" i2="3" l="ENG"><s0>Particle image velocimetry</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03><fC03 i1="18" i2="3" l="SPA"><s0>Velocímetro por imagen de partículas</s0>
<s4>CD</s4>
<s5>96</s5>
</fC03><fN21><s1>254</s1>
</fN21><fN44 i1="01"><s1>OTO</s1>
</fN44><fN82><s1>OTO</s1>
</fN82><pR><fA30 i1="01" i2="1" l="ENG"><s1>International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, and Flow-Induced Vibrations & Noise</s1>
<s2>7</s2>
<s3>Montreal CAN</s3>
<s4>2010-08-01</s4>
</fA30><server><NO>PASCAL 12-0330614 INIST</NO>
<ET>Flow over a cylinder subjected to combined translational and rotational oscillations</ET>
<AU>NAZARINIA (Mehdi); LO JACONO (David); THOMPSON (Mark C.); SHERIDAN (John); DALTON (Charles); DE LANGRE (Emmanuel)</AU>
<AF>Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical and Aerospace Engineering, Monash University, P.O. Box 31/Melbourne, Victoria 3800/Australie (1 aut., 2 aut., 3 aut., 4 aut.); Université de Toulouse; INPT, UPS; IMFT (Institut de Mecanique des Fluides de Toulouse); Allée Camille Soula/31400, Toulouse/France (2 aut.); CNRS; IMFT/31400 Toulouse/France (2 aut.); Department of Mechanical Engineering, University of Houston/Houston, TX 77204-4006/Etats-Unis (1 aut.); Hydrodynamics Laboratory - LadHyx, Ecole Polytechnique/91128 Palaiseau/France (2 aut.)</AF>
<DT>Publication en série; Congrès; Niveau analytique</DT>
<SO>Journal of fluids and structures; ISSN 0889-9746; Coden JFSTEF; Royaume-Uni; Da. 2012; Vol. 32; Pp. 135-145; Bibl. 3/4 p.</SO>
<LA>Anglais</LA>
<EA>The experimental research reported here employs particle image velocimetry to extend the study of Nazarinia et al. (2009a), recording detailed vorticity fields in the near-wake of a circular cylinder undergoing combined translational and rotational oscillatory motions. The focus of the present study is to examine the effect of the ratio between the cross-stream translational and rotational velocities and frequencies on the synchronization of the near-wake structures for multiple phase differences between the two motions. The frequencies are fixed close to that of the natural frequency of vortex shedding. The results are presented for a fixed amplitude of rotational oscillation of 1 rad and a range of ratios between the translational and rotational velocities (V<sub>R</sub>
) = [0.25, 0.5, 1.0, 1.5] and for a rang of frequency ratios (F<sub>R</sub>
) <sub>=</sub>
[0.5, 1.0,2.0]. In particular, it was found that varying the V<sub>R</sub>
value changed the near-wake structure. The results show that at the lower value of V<sub>R</sub>
= 0.25, for all of the phase differences examined, the vortices are shed in a single-row 2S mode aligned in the medial plane with a slight offset from the centreline and also synchronized with the combined oscillatory motion. As V<sub>R</sub>
increases the vortex shedding mode changes from a 2S single-row to a 2S double-row structure and eventually back to the single-row (at V<sub>R</sub>
= 0.5). Increasing V<sub>R</sub>
further resulted in the loss of lock-on over the range of negative phase angles and a transition from the 2S to P+S mode for the in-phase case. There was transition back to the 2S wake mode with a further decrease in ϕ. For higher V<sub>R</sub>
the range of desynchronization increased. In the second and third parts of this paper it is shown that the occurrence of unlocked wake flow as the phase angle is varied is greater when the frequency ratio between the imposed oscillatory motions and the natural vortex shedding frequency F<sub>RN</sub>
is higher than unity. The vortices are synchronized in the near-wake at F<sub>RN</sub>
values less than unity and unlocked when F<sub>RN</sub>
> 1.0. In particular, the near-wake structures have also been shown to be synchronized for F<sub>R</sub>
= 0.5 and unlocked for F<sub>R</sub>
= 2.0.</EA><CC>001B40G27V; 001B40G32F</CC>
<FD>Ecoulement turbulent; Vorticité; Ecoulement tourbillonnaire; Sillage proche; Déphasage; Fréquence propre; Détachement tourbillonnaire; Résonance; Transition phase; Corps arête vive; Cylindre circulaire; Système tournant; Synchronisation; Champ proche; Phase multiple; Etude expérimentale; .; Vélocimétrie image particule</FD>
<ED>Turbulent flow; Vorticity; Vortex flow; Near wake; Phase shift; Eigenfrequency; Vortex shedding; Resonance; Phase transitions; Bluff body; Circular cylinder; Rotating system; Synchronization; Near field; Multiple phase; Experimental study; Particle image velocimetry</ED>
<SD>Estela próxima; Desprendimiento vorticial; Transición fase; Cuerpo arista viva; Cilindro circular; Sistema giratorio; Campo próximo; Fase múltiple; Velocímetro por imagen de partículas</SD>
<LO>INIST-21394.354000500824610100</LO>
<ID>12-0330614</ID>
</server>
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