Wake stability features behind a square cylinder: Focus on small incidence angles
Identifieur interne :
004511 ( PascalFrancis/Curation );
précédent :
004510;
suivant :
004512
Wake stability features behind a square cylinder: Focus on small incidence angles
Auteurs : Gregory J. Sheard [
Australie]
Source :
-
Journal of fluids and structures [ 0889-9746 ] ; 2011.
RBID : Pascal:11-0375060
Descripteurs français
- Pascal (Inist)
- Sillage,
Angle incidence,
Nombre Reynolds,
Mode propre,
Stabilité linéaire,
Longueur onde,
Corps arête vive,
Sous harmonique,
Problème valeur propre,
Modélisation,
Méthode Floquet.
English descriptors
- KwdEn :
- Bluff body,
Eigenmode,
Eigenvalue problem,
Floquet method,
Incidence angle,
Linear stability,
Modelling,
Reynolds number,
Subharmonic,
Wakes,
Wavelengths.
Abstract
The stability of the flow behind a cylinder with a square cross-section is investigated with a focus on small incidence angles 0° ≤ α ≤ 12°. The first-occurring Mode A instability is found to be completely suppressed as the incidence angle is increased through α ≃ 10.5°. The critical Reynolds number curve for the quasi-periodic mode is found to smoothly join the transition curve for the subharmonic mode. The switch from quasi-periodic to subharmonic properties occurs as α is increased from 2° to 3°, with no appreciable change in the structure of the leading eigenmode. Changes in the gradient of the critical Reynolds number curve with α, the gradient of the instability growth rate with Reynolds number, and the dominant spanwise wavelength demonstrate that the switch from quasi-periodic to subharmonic eigenvalues brings about subtle changes in the stability of the flow. The Reynolds number-incidence angle regimes for linear stability have been comprehensively mapped.
| 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 27 |
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| A06 | | | | @2 5-6 |
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| A08 | 01 | 1 | ENG | @1 Wake stability features behind a square cylinder: Focus on small incidence angles |
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| A09 | 01 | 1 | ENG | @1 IUTAM SYMPOSIUM ON BLUFF BODY WAKES AND VORTEX INDUCED VIBRATIONS (BBVIV-6) |
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| A11 | 01 | 1 | | @1 SHEARD (Gregory J.) |
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| A12 | 01 | 1 | | @1 LEWEKE (Thomas) @9 ed. |
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| A12 | 02 | 1 | | @1 WILLIAMSON (Charles) @9 ed. |
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| A14 | 01 | | | @1 Department of Mechanical and Aerospace Engineering, Monash University @2 VIC 3800 @3 AUS @Z 1 aut. |
|---|
| A15 | 01 | | | @1 Institut de Recherche sur les Phénomènes Hors Equilibre (IRPHE) CNRS/Universités Aix-Marseille/Centrale Marseille @2 Marseille @3 FRA @Z 1 aut. |
|---|
| A15 | 02 | | | @1 Sibley School of Mechanical and Aerospace Engineering Cornell University @2 Ithaca, NY @3 USA @Z 2 aut. |
|---|
| A18 | 01 | 1 | | @1 International Union of Theoretical and Applied Mechanics (IUTAM) @3 INT @9 org-cong. |
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| A18 | 02 | 1 | | @1 Office of Naval Research @3 INC @9 org-cong. |
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| A18 | 03 | 1 | | @1 Institut de Recherche sur les Phénomènes Hors Equilibre (IRPHE) @3 FRA @9 org-cong. |
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| A18 | 04 | 1 | | @1 CNRS @3 FRA @9 org-cong. |
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| A18 | 05 | 1 | | @1 Cornell University. Fluid Dynamics Research Laboratories @3 USA @9 org-cong. |
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| A20 | | | | @1 734-742 |
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| A21 | | | | @1 2011 |
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| A23 | 01 | | | @0 ENG |
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| A43 | 01 | | | @1 INIST @2 21394 @5 354000191098430090 |
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| A44 | | | | @0 0000 @1 © 2011 INIST-CNRS. All rights reserved. |
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| A45 | | | | @0 1/2 p. |
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| A47 | 01 | 1 | | @0 11-0375060 |
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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 |
|---|
| A66 | 01 | | | @0 GBR |
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| C01 | 01 | | ENG | @0 The stability of the flow behind a cylinder with a square cross-section is investigated with a focus on small incidence angles 0° ≤ α ≤ 12°. The first-occurring Mode A instability is found to be completely suppressed as the incidence angle is increased through α ≃ 10.5°. The critical Reynolds number curve for the quasi-periodic mode is found to smoothly join the transition curve for the subharmonic mode. The switch from quasi-periodic to subharmonic properties occurs as α is increased from 2° to 3°, with no appreciable change in the structure of the leading eigenmode. Changes in the gradient of the critical Reynolds number curve with α, the gradient of the instability growth rate with Reynolds number, and the dominant spanwise wavelength demonstrate that the switch from quasi-periodic to subharmonic eigenvalues brings about subtle changes in the stability of the flow. The Reynolds number-incidence angle regimes for linear stability have been comprehensively mapped. |
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| C02 | 01 | 3 | | @0 001B40G20 |
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| C03 | 01 | 3 | FRE | @0 Sillage @5 06 |
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| C03 | 01 | 3 | ENG | @0 Wakes @5 06 |
|---|
| C03 | 02 | 3 | FRE | @0 Angle incidence @5 07 |
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| C03 | 02 | 3 | ENG | @0 Incidence angle @5 07 |
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| C03 | 03 | 3 | FRE | @0 Nombre Reynolds @5 08 |
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| C03 | 03 | 3 | ENG | @0 Reynolds number @5 08 |
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| C03 | 04 | X | FRE | @0 Mode propre @5 09 |
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| C03 | 04 | X | ENG | @0 Eigenmode @5 09 |
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| C03 | 04 | X | SPA | @0 Modo propio @5 09 |
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| C03 | 05 | X | FRE | @0 Stabilité linéaire @5 10 |
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| C03 | 05 | X | ENG | @0 Linear stability @5 10 |
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| C03 | 05 | X | SPA | @0 Estabilidad lineal @5 10 |
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| C03 | 06 | 3 | FRE | @0 Longueur onde @5 15 |
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| C03 | 06 | 3 | ENG | @0 Wavelengths @5 15 |
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| C03 | 07 | X | FRE | @0 Corps arête vive @5 16 |
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| C03 | 07 | X | ENG | @0 Bluff body @5 16 |
|---|
| C03 | 07 | X | SPA | @0 Cuerpo arista viva @5 16 |
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| C03 | 08 | X | FRE | @0 Sous harmonique @5 23 |
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| C03 | 08 | X | ENG | @0 Subharmonic @5 23 |
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| C03 | 08 | X | SPA | @0 Subarmónica @5 23 |
|---|
| C03 | 09 | X | FRE | @0 Problème valeur propre @5 24 |
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| C03 | 09 | X | ENG | @0 Eigenvalue problem @5 24 |
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| C03 | 09 | X | SPA | @0 Problema valor propio @5 24 |
|---|
| C03 | 10 | 3 | FRE | @0 Modélisation @5 25 |
|---|
| C03 | 10 | 3 | ENG | @0 Modelling @5 25 |
|---|
| C03 | 11 | X | FRE | @0 Méthode Floquet @5 26 |
|---|
| C03 | 11 | X | ENG | @0 Floquet method @5 26 |
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| C03 | 11 | X | SPA | @0 Método Floquet @5 26 |
|---|
| N21 | | | | @1 255 |
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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 IUTAM Symposium on Bluff Wakes and VOrtex-Induced Vibrations @2 6 @3 Capri Island ITA @4 2010-06-22 |
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Le document en format XML
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<author><name sortKey="Sheard, Gregory J" sort="Sheard, Gregory J" uniqKey="Sheard G" first="Gregory J." last="Sheard">Gregory J. Sheard</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Mechanical and Aerospace Engineering, Monash University</s1>
<s2>VIC 3800</s2>
<s3>AUS</s3>
<sZ>1 aut.</sZ>
</inist:fA14><country>Australie</country>
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<author><name sortKey="Sheard, Gregory J" sort="Sheard, Gregory J" uniqKey="Sheard G" first="Gregory J." last="Sheard">Gregory J. Sheard</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Department of Mechanical and Aerospace Engineering, Monash University</s1>
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</inist:fA14><country>Australie</country>
</affiliation><series><title level="j" type="main">Journal of fluids and structures</title>
<title level="j" type="abbreviated">J. fluids struct.</title>
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<imprint><date when="2011">2011</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>Eigenmode</term>
<term>Eigenvalue problem</term>
<term>Floquet method</term>
<term>Incidence angle</term>
<term>Linear stability</term>
<term>Modelling</term>
<term>Reynolds number</term>
<term>Subharmonic</term>
<term>Wakes</term>
<term>Wavelengths</term>
</keywords><keywords scheme="Pascal" xml:lang="fr"><term>Sillage</term>
<term>Angle incidence</term>
<term>Nombre Reynolds</term>
<term>Mode propre</term>
<term>Stabilité linéaire</term>
<term>Longueur onde</term>
<term>Corps arête vive</term>
<term>Sous harmonique</term>
<term>Problème valeur propre</term>
<term>Modélisation</term>
<term>Méthode Floquet</term>
</keywords><front><div type="abstract" xml:lang="en">The stability of the flow behind a cylinder with a square cross-section is investigated with a focus on small incidence angles 0° ≤ α ≤ 12°. The first-occurring Mode A instability is found to be completely suppressed as the incidence angle is increased through α ≃ 10.5°. The critical Reynolds number curve for the quasi-periodic mode is found to smoothly join the transition curve for the subharmonic mode. The switch from quasi-periodic to subharmonic properties occurs as α is increased from 2° to 3°, with no appreciable change in the structure of the leading eigenmode. Changes in the gradient of the critical Reynolds number curve with α, the gradient of the instability growth rate with Reynolds number, and the dominant spanwise wavelength demonstrate that the switch from quasi-periodic to subharmonic eigenvalues brings about subtle changes in the stability of the flow. The Reynolds number-incidence angle regimes for linear stability have been comprehensively mapped.</div>
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<s9>ed.</s9>
</fA12><fA12 i1="02" i2="1"><s1>WILLIAMSON (Charles)</s1>
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<s3>AUS</s3>
<sZ>1 aut.</sZ>
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<s2>Marseille</s2>
<s3>FRA</s3>
<sZ>1 aut.</sZ>
</fA15><fA15 i1="02"><s1>Sibley School of Mechanical and Aerospace Engineering Cornell University</s1>
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<s3>USA</s3>
<sZ>2 aut.</sZ>
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<s3>FRA</s3>
<s9>org-cong.</s9>
</fA18><fA18 i1="04" i2="1"><s1>CNRS</s1>
<s3>FRA</s3>
<s9>org-cong.</s9>
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</fA47><fA60><s1>P</s1>
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</fA66><fC01 i1="01" l="ENG"><s0>The stability of the flow behind a cylinder with a square cross-section is investigated with a focus on small incidence angles 0° ≤ α ≤ 12°. The first-occurring Mode A instability is found to be completely suppressed as the incidence angle is increased through α ≃ 10.5°. The critical Reynolds number curve for the quasi-periodic mode is found to smoothly join the transition curve for the subharmonic mode. The switch from quasi-periodic to subharmonic properties occurs as α is increased from 2° to 3°, with no appreciable change in the structure of the leading eigenmode. Changes in the gradient of the critical Reynolds number curve with α, the gradient of the instability growth rate with Reynolds number, and the dominant spanwise wavelength demonstrate that the switch from quasi-periodic to subharmonic eigenvalues brings about subtle changes in the stability of the flow. The Reynolds number-incidence angle regimes for linear stability have been comprehensively mapped.</s0>
</fC01><fC02 i1="01" i2="3"><s0>001B40G20</s0>
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<s5>06</s5>
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<s5>06</s5>
</fC03><fC03 i1="02" i2="3" l="FRE"><s0>Angle incidence</s0>
<s5>07</s5>
</fC03><fC03 i1="02" i2="3" l="ENG"><s0>Incidence angle</s0>
<s5>07</s5>
</fC03><fC03 i1="03" i2="3" l="FRE"><s0>Nombre Reynolds</s0>
<s5>08</s5>
</fC03><fC03 i1="03" i2="3" l="ENG"><s0>Reynolds number</s0>
<s5>08</s5>
</fC03><fC03 i1="04" i2="X" l="FRE"><s0>Mode propre</s0>
<s5>09</s5>
</fC03><fC03 i1="04" i2="X" l="ENG"><s0>Eigenmode</s0>
<s5>09</s5>
</fC03><fC03 i1="04" i2="X" l="SPA"><s0>Modo propio</s0>
<s5>09</s5>
</fC03><fC03 i1="05" i2="X" l="FRE"><s0>Stabilité linéaire</s0>
<s5>10</s5>
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<s5>10</s5>
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<s5>15</s5>
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<s5>16</s5>
</fC03><fC03 i1="07" i2="X" l="ENG"><s0>Bluff body</s0>
<s5>16</s5>
</fC03><fC03 i1="07" i2="X" l="SPA"><s0>Cuerpo arista viva</s0>
<s5>16</s5>
</fC03><fC03 i1="08" i2="X" l="FRE"><s0>Sous harmonique</s0>
<s5>23</s5>
</fC03><fC03 i1="08" i2="X" l="ENG"><s0>Subharmonic</s0>
<s5>23</s5>
</fC03><fC03 i1="08" i2="X" l="SPA"><s0>Subarmónica</s0>
<s5>23</s5>
</fC03><fC03 i1="09" i2="X" l="FRE"><s0>Problème valeur propre</s0>
<s5>24</s5>
</fC03><fC03 i1="09" i2="X" l="ENG"><s0>Eigenvalue problem</s0>
<s5>24</s5>
</fC03><fC03 i1="09" i2="X" l="SPA"><s0>Problema valor propio</s0>
<s5>24</s5>
</fC03><fC03 i1="10" i2="3" l="FRE"><s0>Modélisation</s0>
<s5>25</s5>
</fC03><fC03 i1="10" i2="3" l="ENG"><s0>Modelling</s0>
<s5>25</s5>
</fC03><fC03 i1="11" i2="X" l="FRE"><s0>Méthode Floquet</s0>
<s5>26</s5>
</fC03><fC03 i1="11" i2="X" l="ENG"><s0>Floquet method</s0>
<s5>26</s5>
</fC03><fC03 i1="11" i2="X" l="SPA"><s0>Método Floquet</s0>
<s5>26</s5>
</fC03><fN21><s1>255</s1>
</fN21><fN44 i1="01"><s1>OTO</s1>
</fN44><fN82><s1>OTO</s1>
</fN82><pR><fA30 i1="01" i2="1" l="ENG"><s1>IUTAM Symposium on Bluff Wakes and VOrtex-Induced Vibrations</s1>
<s2>6</s2>
<s3>Capri Island ITA</s3>
<s4>2010-06-22</s4>
</fA30>
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