AustralieFrV1, PascalFrancis, Corpus, bibRecord, 005B62

Self-sustained oscillations in flows around long blunt plates

Identifieur interne : 005B62 ( PascalFrancis/Corpus ); précédent : 005B61; suivant : 005B63

Self-sustained oscillations in flows around long blunt plates

Auteurs : K. Hourigan ; M. C. Thompson ; B. T. Tan

Source :

Journal of fluids and structures [ 0889-9746 ] ; 2001.

RBID : Pascal:01-0326679

Descripteurs français

Pascal (Inist)
- Décollement écoulement, Formation motif, Plaque rectangulaire, Ecoulement tourbillonnaire, Résonance, Cylindre circulaire, Conduite, Ecoulement laminaire, Aérodynamique, Plaque plane, Détachement tourbillonnaire, Structure sandwich, Couche limite, Sillage, Nombre Strouhal, Autooscillation, Modèle 3 dimensions, Bord attaque, Bord fuite, Corps arête vive, Tourbillon extrémité, 4785G.

English descriptors

KwdEn :
- Aerodynamics, Bluff body, Boundary layers, Circular cylinder, Ducts, End vortex, Flat plate, Flow separation, Laminar flow, Leading edge, Patterning, Rectangular plate, Resonance, Sandwich structures, Selfoscillation, Strouhal number, Three dimensional model, Trailing edge, Vortex flow, Vortex shedding, Wakes.

Abstract

The presence of flow separation from both leading and trailing edges of elongated bluff bodies leads to vortex interactions and resonances not observed in shorter bodies such as circular and square cylinders. Stepwise behaviour in the Strouhal number with increasing plate chord-to-thickness ratio has been observed for long bodies in a number of different situations: natural shedding, under transverse forcing, and with excited duct modes. In the present study, an investigation is made of the predicted unforced laminar flow around long plates (up to chord, c, to thickness, t, ratio c/t = 16). The two main types of plate geometry considered are rectangular plates and plates with an aerodynamic leading edge. The rectangular plate represents a geometrical extension of the normal flat and square plates. The aerodynamic leading-edge plate is a natural precursor to the rectangular plate because the vortex shedding is only from the trailing edge. The natural flow around rectangular plates is of greater complexity due to the interaction between the leading- and trailing-edge shedding. The previously neglected influence of the trailing-edge vortex shedding is found to play an important role in the stepwise progression of the Strouhal number with chord-to-thickness ratio. In addition, the formation of three-dimensional patterns in the boundary layer along the plate and in the trailing-edge wake is predicted. The predicted boundary layer hairpin vortices are compared with previous observations and the predicted streamwise modes in the wake are compared with those found in the case of circular cylinders.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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A02	`01`			`@0 JFSTEF`
A03		`1`		`@0 J. fluids struct.`
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A06				`@2 3-4`
A08	`01`	`1`	`ENG`	`@1 Self-sustained oscillations in flows around long blunt plates`
A09	`01`	`1`	`ENG`	`@1 Bluff Body Wakes and Vortex - Induced Vibrations`
A11	`01`	`1`		`@1 HOURIGAN (K.)`
A11	`02`	`1`		`@1 THOMPSON (M. C.)`
A11	`03`	`1`		`@1 TAN (B. T.)`
A12	`01`	`1`		`@1 LEWEKE (Thomas) @9 ed.`
A12	`02`	`1`		`@1 BEARMAN (Peter W.) @9 ed.`
A12	`03`	`1`		`@1 WILLIAMSON (Charles H. K.) @9 ed.`
A14	`01`			`@1 Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical Engineering, Monash University @2 Clayton, 3800 @3 AUS @Z 1 aut. @Z 2 aut. @Z 3 aut.`
A15	`01`			`@1 IRPHE/CNRS @3 FRA @Z 1 aut.`
A15	`02`			`@1 Department of Aeronautics, Imperial College of Science, Technology and Medicine, Prince Consort Road @2 London SW7 2BY @3 GBR @Z 2 aut.`
A15	`03`			`@1 Sibley School of Mechanical & Aerospace Engineering, Upson Hall, Cornell University @2 Ithaca NY 14853-7501 @3 USA @Z 3 aut.`
A18	`01`	`1`		`@1 International Union of Theoretical and Applied Mechanics (IUTAM) @3 INT @9 patr.`
A20				`@1 387-398 @3 1 pl. h. t.`
A21				`@1 2001`
A23	`01`			`@0 ENG`
A43	`01`			`@1 INIST @2 21394 @5 354000095616070010`
A44				`@0 0000 @1 © 2001 INIST-CNRS. All rights reserved.`
A45				`@0 23 ref.`
A47	`01`	`1`		`@0 01-0326679`
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C01	`01`		`ENG`	@0 The presence of flow separation from both leading and trailing edges of elongated bluff bodies leads to vortex interactions and resonances not observed in shorter bodies such as circular and square cylinders. Stepwise behaviour in the Strouhal number with increasing plate chord-to-thickness ratio has been observed for long bodies in a number of different situations: natural shedding, under transverse forcing, and with excited duct modes. In the present study, an investigation is made of the predicted unforced laminar flow around long plates (up to chord, c, to thickness, t, ratio c/t = 16). The two main types of plate geometry considered are rectangular plates and plates with an aerodynamic leading edge. The rectangular plate represents a geometrical extension of the normal flat and square plates. The aerodynamic leading-edge plate is a natural precursor to the rectangular plate because the vortex shedding is only from the trailing edge. The natural flow around rectangular plates is of greater complexity due to the interaction between the leading- and trailing-edge shedding. The previously neglected influence of the trailing-edge vortex shedding is found to play an important role in the stepwise progression of the Strouhal number with chord-to-thickness ratio. In addition, the formation of three-dimensional patterns in the boundary layer along the plate and in the trailing-edge wake is predicted. The predicted boundary layer hairpin vortices are compared with previous observations and the predicted streamwise modes in the wake are compared with those found in the case of circular cylinders.
C02	`01`	`3`		`@0 001B40G85B`
C03	`01`	`3`	`FRE`	`@0 Décollement écoulement @5 01`
C03	`01`	`3`	`ENG`	`@0 Flow separation @5 01`
C03	`02`	`X`	`FRE`	`@0 Formation motif @5 03`
C03	`02`	`X`	`ENG`	`@0 Patterning @5 03`
C03	`02`	`X`	`SPA`	`@0 Formacíon motivo @5 03`
C03	`03`	`X`	`FRE`	`@0 Plaque rectangulaire @5 04`
C03	`03`	`X`	`ENG`	`@0 Rectangular plate @5 04`
C03	`03`	`X`	`SPA`	`@0 Placa rectangular @5 04`
C03	`04`	`3`	`FRE`	`@0 Ecoulement tourbillonnaire @5 05`
C03	`04`	`3`	`ENG`	`@0 Vortex flow @5 05`
C03	`05`	`3`	`FRE`	`@0 Résonance @5 06`
C03	`05`	`3`	`ENG`	`@0 Resonance @5 06`
C03	`06`	`X`	`FRE`	`@0 Cylindre circulaire @5 07`
C03	`06`	`X`	`ENG`	`@0 Circular cylinder @5 07`
C03	`06`	`X`	`SPA`	`@0 Cilindro circular @5 07`
C03	`07`	`3`	`FRE`	`@0 Conduite @5 08`
C03	`07`	`3`	`ENG`	`@0 Ducts @5 08`
C03	`08`	`3`	`FRE`	`@0 Ecoulement laminaire @5 09`
C03	`08`	`3`	`ENG`	`@0 Laminar flow @5 09`
C03	`09`	`3`	`FRE`	`@0 Aérodynamique @5 10`
C03	`09`	`3`	`ENG`	`@0 Aerodynamics @5 10`
C03	`10`	`X`	`FRE`	`@0 Plaque plane @5 11`
C03	`10`	`X`	`ENG`	`@0 Flat plate @5 11`
C03	`10`	`X`	`SPA`	`@0 Placa plana @5 11`
C03	`11`	`X`	`FRE`	`@0 Détachement tourbillonnaire @5 12`
C03	`11`	`X`	`ENG`	`@0 Vortex shedding @5 12`
C03	`11`	`X`	`SPA`	`@0 Desprendimiento vorticial @5 12`
C03	`12`	`3`	`FRE`	`@0 Structure sandwich @5 13`
C03	`12`	`3`	`ENG`	`@0 Sandwich structures @5 13`
C03	`13`	`3`	`FRE`	`@0 Couche limite @5 14`
C03	`13`	`3`	`ENG`	`@0 Boundary layers @5 14`
C03	`14`	`3`	`FRE`	`@0 Sillage @5 15`
C03	`14`	`3`	`ENG`	`@0 Wakes @5 15`
C03	`15`	`3`	`FRE`	`@0 Nombre Strouhal @5 16`
C03	`15`	`3`	`ENG`	`@0 Strouhal number @5 16`
C03	`16`	`X`	`FRE`	`@0 Autooscillation @5 17`
C03	`16`	`X`	`ENG`	`@0 Selfoscillation @5 17`
C03	`16`	`X`	`SPA`	`@0 Autooscilación @5 17`
C03	`17`	`X`	`FRE`	`@0 Modèle 3 dimensions @5 18`
C03	`17`	`X`	`ENG`	`@0 Three dimensional model @5 18`
C03	`17`	`X`	`SPA`	`@0 Modelo 3 dimensiones @5 18`
C03	`18`	`X`	`FRE`	`@0 Bord attaque @5 19`
C03	`18`	`X`	`ENG`	`@0 Leading edge @5 19`
C03	`18`	`X`	`SPA`	`@0 Borde ataque @5 19`
C03	`19`	`X`	`FRE`	`@0 Bord fuite @5 20`
C03	`19`	`X`	`ENG`	`@0 Trailing edge @5 20`
C03	`19`	`X`	`SPA`	`@0 Borde salida @5 20`
C03	`20`	`X`	`FRE`	`@0 Corps arête vive @5 21`
C03	`20`	`X`	`ENG`	`@0 Bluff body @5 21`
C03	`20`	`X`	`SPA`	`@0 Cuerpo arista viva @5 21`
C03	`21`	`X`	`FRE`	`@0 Tourbillon extrémité @5 23`
C03	`21`	`X`	`ENG`	`@0 End vortex @5 23`
C03	`21`	`X`	`SPA`	`@0 Torbellino extremidad @5 23`
C03	`22`	`3`	`FRE`	`@0 4785G @2 PAC @4 INC @5 56`
N21				`@1 225`

A30	`01`	`1`	`ENG`	`@1 BBVIV IUTAM Symposium on Bluff Body Wakes and Vortex-Induced Vibrations @2 2 @3 Carry-Le-Rouet FRA @4 2000-06-13`

Format Inist (serveur)

NO :	PASCAL 01-0326679 INIST
ET :	Self-sustained oscillations in flows around long blunt plates
AU :	HOURIGAN (K.); THOMPSON (M. C.); TAN (B. T.); LEWEKE (Thomas); BEARMAN (Peter W.); WILLIAMSON (Charles H. K.)
AF :	Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical Engineering, Monash University/Clayton, 3800/Australie (1 aut., 2 aut., 3 aut.); IRPHE/CNRS/France (1 aut.); Department of Aeronautics, Imperial College of Science, Technology and Medicine, Prince Consort Road/London SW7 2BY/Royaume-Uni (2 aut.); Sibley School of Mechanical & Aerospace Engineering, Upson Hall, Cornell University/Ithaca NY 14853-7501/Etats-Unis (3 aut.)
DT :	Publication en série; Congrès; Niveau analytique
SO :	Journal of fluids and structures; ISSN 0889-9746; Coden JFSTEF; Royaume-Uni; Da. 2001; Vol. 15; No. 3-4; Pp. 387-398; Bibl. 23 ref.; 1 pl. h. t.
LA :	Anglais
EA :	The presence of flow separation from both leading and trailing edges of elongated bluff bodies leads to vortex interactions and resonances not observed in shorter bodies such as circular and square cylinders. Stepwise behaviour in the Strouhal number with increasing plate chord-to-thickness ratio has been observed for long bodies in a number of different situations: natural shedding, under transverse forcing, and with excited duct modes. In the present study, an investigation is made of the predicted unforced laminar flow around long plates (up to chord, c, to thickness, t, ratio c/t = 16). The two main types of plate geometry considered are rectangular plates and plates with an aerodynamic leading edge. The rectangular plate represents a geometrical extension of the normal flat and square plates. The aerodynamic leading-edge plate is a natural precursor to the rectangular plate because the vortex shedding is only from the trailing edge. The natural flow around rectangular plates is of greater complexity due to the interaction between the leading- and trailing-edge shedding. The previously neglected influence of the trailing-edge vortex shedding is found to play an important role in the stepwise progression of the Strouhal number with chord-to-thickness ratio. In addition, the formation of three-dimensional patterns in the boundary layer along the plate and in the trailing-edge wake is predicted. The predicted boundary layer hairpin vortices are compared with previous observations and the predicted streamwise modes in the wake are compared with those found in the case of circular cylinders.
CC :	001B40G85B
FD :	Décollement écoulement; Formation motif; Plaque rectangulaire; Ecoulement tourbillonnaire; Résonance; Cylindre circulaire; Conduite; Ecoulement laminaire; Aérodynamique; Plaque plane; Détachement tourbillonnaire; Structure sandwich; Couche limite; Sillage; Nombre Strouhal; Autooscillation; Modèle 3 dimensions; Bord attaque; Bord fuite; Corps arête vive; Tourbillon extrémité; 4785G
ED :	Flow separation; Patterning; Rectangular plate; Vortex flow; Resonance; Circular cylinder; Ducts; Laminar flow; Aerodynamics; Flat plate; Vortex shedding; Sandwich structures; Boundary layers; Wakes; Strouhal number; Selfoscillation; Three dimensional model; Leading edge; Trailing edge; Bluff body; End vortex
SD :	Formacíon motivo; Placa rectangular; Cilindro circular; Placa plana; Desprendimiento vorticial; Autooscilación; Modelo 3 dimensiones; Borde ataque; Borde salida; Cuerpo arista viva; Torbellino extremidad
LO :	INIST-21394.354000095616070010
ID :	01-0326679

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Pascal:01-0326679

Le document en format XML

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<front><div type="abstract" xml:lang="en">The presence of flow separation from both leading and trailing edges of elongated bluff bodies leads to vortex interactions and resonances not observed in shorter bodies such as circular and square cylinders. Stepwise behaviour in the Strouhal number with increasing plate chord-to-thickness ratio has been observed for long bodies in a number of different situations: natural shedding, under transverse forcing, and with excited duct modes. In the present study, an investigation is made of the predicted unforced laminar flow around long plates (up to chord, c, to thickness, t, ratio c/t = 16). The two main types of plate geometry considered are rectangular plates and plates with an aerodynamic leading edge. The rectangular plate represents a geometrical extension of the normal flat and square plates. The aerodynamic leading-edge plate is a natural precursor to the rectangular plate because the vortex shedding is only from the trailing edge. The natural flow around rectangular plates is of greater complexity due to the interaction between the leading- and trailing-edge shedding. The previously neglected influence of the trailing-edge vortex shedding is found to play an important role in the stepwise progression of the Strouhal number with chord-to-thickness ratio. In addition, the formation of three-dimensional patterns in the boundary layer along the plate and in the trailing-edge wake is predicted. The predicted boundary layer hairpin vortices are compared with previous observations and the predicted streamwise modes in the wake are compared with those found in the case of circular cylinders.</div>
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<fA66 i1="01"><s0>GBR</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>The presence of flow separation from both leading and trailing edges of elongated bluff bodies leads to vortex interactions and resonances not observed in shorter bodies such as circular and square cylinders. Stepwise behaviour in the Strouhal number with increasing plate chord-to-thickness ratio has been observed for long bodies in a number of different situations: natural shedding, under transverse forcing, and with excited duct modes. In the present study, an investigation is made of the predicted unforced laminar flow around long plates (up to chord, c, to thickness, t, ratio c/t = 16). The two main types of plate geometry considered are rectangular plates and plates with an aerodynamic leading edge. The rectangular plate represents a geometrical extension of the normal flat and square plates. The aerodynamic leading-edge plate is a natural precursor to the rectangular plate because the vortex shedding is only from the trailing edge. The natural flow around rectangular plates is of greater complexity due to the interaction between the leading- and trailing-edge shedding. The previously neglected influence of the trailing-edge vortex shedding is found to play an important role in the stepwise progression of the Strouhal number with chord-to-thickness ratio. In addition, the formation of three-dimensional patterns in the boundary layer along the plate and in the trailing-edge wake is predicted. The predicted boundary layer hairpin vortices are compared with previous observations and the predicted streamwise modes in the wake are compared with those found in the case of circular cylinders.</s0>
</fC01>
<fC02 i1="01" i2="3"><s0>001B40G85B</s0>
</fC02>
<fC03 i1="01" i2="3" l="FRE"><s0>Décollement écoulement</s0>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="3" l="ENG"><s0>Flow separation</s0>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE"><s0>Formation motif</s0>
<s5>03</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG"><s0>Patterning</s0>
<s5>03</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA"><s0>Formacíon motivo</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE"><s0>Plaque rectangulaire</s0>
<s5>04</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG"><s0>Rectangular plate</s0>
<s5>04</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA"><s0>Placa rectangular</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="3" l="FRE"><s0>Ecoulement tourbillonnaire</s0>
<s5>05</s5>
</fC03>
<fC03 i1="04" i2="3" l="ENG"><s0>Vortex flow</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="3" l="FRE"><s0>Résonance</s0>
<s5>06</s5>
</fC03>
<fC03 i1="05" i2="3" l="ENG"><s0>Resonance</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE"><s0>Cylindre circulaire</s0>
<s5>07</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG"><s0>Circular cylinder</s0>
<s5>07</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA"><s0>Cilindro circular</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="3" l="FRE"><s0>Conduite</s0>
<s5>08</s5>
</fC03>
<fC03 i1="07" i2="3" l="ENG"><s0>Ducts</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="3" l="FRE"><s0>Ecoulement laminaire</s0>
<s5>09</s5>
</fC03>
<fC03 i1="08" i2="3" l="ENG"><s0>Laminar flow</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="3" l="FRE"><s0>Aérodynamique</s0>
<s5>10</s5>
</fC03>
<fC03 i1="09" i2="3" l="ENG"><s0>Aerodynamics</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Plaque plane</s0>
<s5>11</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Flat plate</s0>
<s5>11</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Placa plana</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE"><s0>Détachement tourbillonnaire</s0>
<s5>12</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG"><s0>Vortex shedding</s0>
<s5>12</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA"><s0>Desprendimiento vorticial</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="3" l="FRE"><s0>Structure sandwich</s0>
<s5>13</s5>
</fC03>
<fC03 i1="12" i2="3" l="ENG"><s0>Sandwich structures</s0>
<s5>13</s5>
</fC03>
<fC03 i1="13" i2="3" l="FRE"><s0>Couche limite</s0>
<s5>14</s5>
</fC03>
<fC03 i1="13" i2="3" l="ENG"><s0>Boundary layers</s0>
<s5>14</s5>
</fC03>
<fC03 i1="14" i2="3" l="FRE"><s0>Sillage</s0>
<s5>15</s5>
</fC03>
<fC03 i1="14" i2="3" l="ENG"><s0>Wakes</s0>
<s5>15</s5>
</fC03>
<fC03 i1="15" i2="3" l="FRE"><s0>Nombre Strouhal</s0>
<s5>16</s5>
</fC03>
<fC03 i1="15" i2="3" l="ENG"><s0>Strouhal number</s0>
<s5>16</s5>
</fC03>
<fC03 i1="16" i2="X" l="FRE"><s0>Autooscillation</s0>
<s5>17</s5>
</fC03>
<fC03 i1="16" i2="X" l="ENG"><s0>Selfoscillation</s0>
<s5>17</s5>
</fC03>
<fC03 i1="16" i2="X" l="SPA"><s0>Autooscilación</s0>
<s5>17</s5>
</fC03>
<fC03 i1="17" i2="X" l="FRE"><s0>Modèle 3 dimensions</s0>
<s5>18</s5>
</fC03>
<fC03 i1="17" i2="X" l="ENG"><s0>Three dimensional model</s0>
<s5>18</s5>
</fC03>
<fC03 i1="17" i2="X" l="SPA"><s0>Modelo 3 dimensiones</s0>
<s5>18</s5>
</fC03>
<fC03 i1="18" i2="X" l="FRE"><s0>Bord attaque</s0>
<s5>19</s5>
</fC03>
<fC03 i1="18" i2="X" l="ENG"><s0>Leading edge</s0>
<s5>19</s5>
</fC03>
<fC03 i1="18" i2="X" l="SPA"><s0>Borde ataque</s0>
<s5>19</s5>
</fC03>
<fC03 i1="19" i2="X" l="FRE"><s0>Bord fuite</s0>
<s5>20</s5>
</fC03>
<fC03 i1="19" i2="X" l="ENG"><s0>Trailing edge</s0>
<s5>20</s5>
</fC03>
<fC03 i1="19" i2="X" l="SPA"><s0>Borde salida</s0>
<s5>20</s5>
</fC03>
<fC03 i1="20" i2="X" l="FRE"><s0>Corps arête vive</s0>
<s5>21</s5>
</fC03>
<fC03 i1="20" i2="X" l="ENG"><s0>Bluff body</s0>
<s5>21</s5>
</fC03>
<fC03 i1="20" i2="X" l="SPA"><s0>Cuerpo arista viva</s0>
<s5>21</s5>
</fC03>
<fC03 i1="21" i2="X" l="FRE"><s0>Tourbillon extrémité</s0>
<s5>23</s5>
</fC03>
<fC03 i1="21" i2="X" l="ENG"><s0>End vortex</s0>
<s5>23</s5>
</fC03>
<fC03 i1="21" i2="X" l="SPA"><s0>Torbellino extremidad</s0>
<s5>23</s5>
</fC03>
<fC03 i1="22" i2="3" l="FRE"><s0>4785G</s0>
<s2>PAC</s2>
<s4>INC</s4>
<s5>56</s5>
</fC03>
<fN21><s1>225</s1>
</fN21>
</pA>
<pR><fA30 i1="01" i2="1" l="ENG"><s1>BBVIV IUTAM Symposium on Bluff Body Wakes and Vortex-Induced Vibrations</s1>
<s2>2</s2>
<s3>Carry-Le-Rouet FRA</s3>
<s4>2000-06-13</s4>
</fA30>
</pR>
</standard>
<server><NO>PASCAL 01-0326679 INIST</NO>
<ET>Self-sustained oscillations in flows around long blunt plates</ET>
<AU>HOURIGAN (K.); THOMPSON (M. C.); TAN (B. T.); LEWEKE (Thomas); BEARMAN (Peter W.); WILLIAMSON (Charles H. K.)</AU>
<AF>Fluids Laboratory for Aeronautical and Industrial Research (FLAIR), Department of Mechanical Engineering, Monash University/Clayton, 3800/Australie (1 aut., 2 aut., 3 aut.); IRPHE/CNRS/France (1 aut.); Department of Aeronautics, Imperial College of Science, Technology and Medicine, Prince Consort Road/London SW7 2BY/Royaume-Uni (2 aut.); Sibley School of Mechanical & Aerospace Engineering, Upson Hall, Cornell University/Ithaca NY 14853-7501/Etats-Unis (3 aut.)</AF>
<DT>Publication en série; Congrès; Niveau analytique</DT>
<SO>Journal of fluids and structures; ISSN 0889-9746; Coden JFSTEF; Royaume-Uni; Da. 2001; Vol. 15; No. 3-4; Pp. 387-398; Bibl. 23 ref.; 1 pl. h. t.</SO>
<LA>Anglais</LA>
<EA>The presence of flow separation from both leading and trailing edges of elongated bluff bodies leads to vortex interactions and resonances not observed in shorter bodies such as circular and square cylinders. Stepwise behaviour in the Strouhal number with increasing plate chord-to-thickness ratio has been observed for long bodies in a number of different situations: natural shedding, under transverse forcing, and with excited duct modes. In the present study, an investigation is made of the predicted unforced laminar flow around long plates (up to chord, c, to thickness, t, ratio c/t = 16). The two main types of plate geometry considered are rectangular plates and plates with an aerodynamic leading edge. The rectangular plate represents a geometrical extension of the normal flat and square plates. The aerodynamic leading-edge plate is a natural precursor to the rectangular plate because the vortex shedding is only from the trailing edge. The natural flow around rectangular plates is of greater complexity due to the interaction between the leading- and trailing-edge shedding. The previously neglected influence of the trailing-edge vortex shedding is found to play an important role in the stepwise progression of the Strouhal number with chord-to-thickness ratio. In addition, the formation of three-dimensional patterns in the boundary layer along the plate and in the trailing-edge wake is predicted. The predicted boundary layer hairpin vortices are compared with previous observations and the predicted streamwise modes in the wake are compared with those found in the case of circular cylinders.</EA>
<CC>001B40G85B</CC>
<FD>Décollement écoulement; Formation motif; Plaque rectangulaire; Ecoulement tourbillonnaire; Résonance; Cylindre circulaire; Conduite; Ecoulement laminaire; Aérodynamique; Plaque plane; Détachement tourbillonnaire; Structure sandwich; Couche limite; Sillage; Nombre Strouhal; Autooscillation; Modèle 3 dimensions; Bord attaque; Bord fuite; Corps arête vive; Tourbillon extrémité; 4785G</FD>
<ED>Flow separation; Patterning; Rectangular plate; Vortex flow; Resonance; Circular cylinder; Ducts; Laminar flow; Aerodynamics; Flat plate; Vortex shedding; Sandwich structures; Boundary layers; Wakes; Strouhal number; Selfoscillation; Three dimensional model; Leading edge; Trailing edge; Bluff body; End vortex</ED>
<SD>Formacíon motivo; Placa rectangular; Cilindro circular; Placa plana; Desprendimiento vorticial; Autooscilación; Modelo 3 dimensiones; Borde ataque; Borde salida; Cuerpo arista viva; Torbellino extremidad</SD>
<LO>INIST-21394.354000095616070010</LO>
<ID>01-0326679</ID>
</server>
</inist>
</record>

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Self-sustained oscillations in flows around long blunt plates

Self-sustained oscillations in flows around long blunt plates

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