AustralieFrV1, PascalFrancis, Corpus, bibRecord, 002F45

Unsteady flow around impacting bluff bodies

Identifieur interne : 002F45 ( PascalFrancis/Corpus ); précédent : 002F44; suivant : 002F46

Unsteady flow around impacting bluff bodies

Auteurs : T. Leweke ; L. Schouveiler ; M. C. Thompson ; K. Hourigan

Source :

Journal of fluids and structures [ 0889-9746 ] ; 2008.

RBID : Pascal:09-0137568

Descripteurs français

Pascal (Inist)
- Ecoulement instationnaire, Rebond, Incidence normale, Paire tourbillon, Effet paroi, Vorticité, Ecoulement tourbillonnaire, Nombre Reynolds, Etirement, Corps arête vive, Fluide visqueux, Cylindre circulaire, Sphère, Symétrie axiale, Longueur onde, Structure turbulence, Ecoulement bidimensionnel, Incidence oblique.

English descriptors

KwdEn :
- Axial symmetry, Bluff body, Circular cylinder, Normal incidence, Oblique incidence, Rebound, Reynolds number, Spheres, Stretching, Turbulence structure, Two dimensional flow, Unsteady flow, Viscous fluids, Vortex flow, Vortex pair, Vorticity, Wall effects, Wavelengths.

Abstract

The flow resulting from the collision without rebound of generic bluff bodies with a wall in a still viscous fluid is investigated both computationally and experimentally. Emphasis is on the case of a circular cylinder impact (two-dimensional geometry), but comparisons with the flow generated by the impact of a sphere (axisymmetric geometry) are included. For normal cylinder impacts, the two counter-rotating vortices forming behind the body during its motion continue their trajectory towards the wall after the collision, leading to the generation of opposite-signed secondary vorticity at the cylinder and wall surfaces. Secondary vortices forming from this vorticity at higher Reynolds numbers exhibit a short-wavelength three-dimensional instability. Comparison with the sphere impact reveals significant differences in the scales of the vortices after the collision, due to the additional vortex stretching acting in the axisymmetric geometry. This leads to a delay in the onset of three-dimensionality and to a different instability mechanism. Oblique cylinder impacts are also considered. For increasing impact angles, the wall effect is gradually reduced on one side of the cylinder, which favours the roll-up of the secondary vorticity and increases the rebound height of the vortex system.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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A11	`04`	`1`		`@1 HOURIGAN (K.)`
A12	`01`	`1`		`@1 BRAZA (Marianna) @9 ed.`
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A14	`02`			`@1 Fluids Laboratory for Aeronautical and Industrial Research, Department of Mechanical and Aerospace Engineering, Monash University @2 Victoria 3800 @3 AUS @Z 3 aut. @Z 4 aut.`
A14	`03`			`@1 Division of Biological Engineering, Monash University @2 Victoria 3800 @3 AUS @Z 4 aut.`
A15	`01`			`@1 Institut de Mécanique des Fluides, UMR-CNRS-No 5502, Allée du Prof. Camille Soula @2 31400 Toulouse @3 FRA @Z 1 aut.`
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C01	`01`		`ENG`	@0 The flow resulting from the collision without rebound of generic bluff bodies with a wall in a still viscous fluid is investigated both computationally and experimentally. Emphasis is on the case of a circular cylinder impact (two-dimensional geometry), but comparisons with the flow generated by the impact of a sphere (axisymmetric geometry) are included. For normal cylinder impacts, the two counter-rotating vortices forming behind the body during its motion continue their trajectory towards the wall after the collision, leading to the generation of opposite-signed secondary vorticity at the cylinder and wall surfaces. Secondary vortices forming from this vorticity at higher Reynolds numbers exhibit a short-wavelength three-dimensional instability. Comparison with the sphere impact reveals significant differences in the scales of the vortices after the collision, due to the additional vortex stretching acting in the axisymmetric geometry. This leads to a delay in the onset of three-dimensionality and to a different instability mechanism. Oblique cylinder impacts are also considered. For increasing impact angles, the wall effect is gradually reduced on one side of the cylinder, which favours the roll-up of the secondary vorticity and increases the rebound height of the vortex system.
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C03	`01`	`3`	`ENG`	`@0 Unsteady flow @5 06`
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C03	`02`	`X`	`ENG`	`@0 Rebound @5 07`
C03	`02`	`X`	`SPA`	`@0 Rebote @5 07`
C03	`03`	`X`	`FRE`	`@0 Incidence normale @5 08`
C03	`03`	`X`	`ENG`	`@0 Normal incidence @5 08`
C03	`03`	`X`	`SPA`	`@0 Incidencia normal @5 08`
C03	`04`	`X`	`FRE`	`@0 Paire tourbillon @5 09`
C03	`04`	`X`	`ENG`	`@0 Vortex pair @5 09`
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C03	`15`	`3`	`ENG`	`@0 Wavelengths @5 20`
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C03	`18`	`X`	`FRE`	`@0 Incidence oblique @5 41`
C03	`18`	`X`	`ENG`	`@0 Oblique incidence @5 41`
C03	`18`	`X`	`SPA`	`@0 Incidencia oblicua @5 41`
N21				`@1 096`
N44	`01`			`@1 OTO`
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A30	`01`	`1`	`ENG`	`@1 IUTAM symposium on Unsteady Separated Flows and their control @2 2 @3 Corfu GRC @4 2007-06-18`

Format Inist (serveur)

NO :	PASCAL 09-0137568 INIST
ET :	Unsteady flow around impacting bluff bodies
AU :	LEWEKE (T.); SCHOUVEILER (L.); THOMPSON (M. C.); HOURIGAN (K.); BRAZA (Marianna); HOURIGAN (Kerry)
AF :	Institut de Recherche sur les Phénomènes Hors Équilibre ¯ CNRS, École Centrale, Aix-Marseille Université, 49 rue Frédéric Joliot-Curie, B.P. 146/13384 Marseille/France (1 aut., 2 aut.); Fluids Laboratory for Aeronautical and Industrial Research, Department of Mechanical and Aerospace Engineering, Monash University/Victoria 3800/Australie (3 aut., 4 aut.); Division of Biological Engineering, Monash University/Victoria 3800/Australie (4 aut.); Institut de Mécanique des Fluides, UMR-CNRS-No 5502, Allée du Prof. Camille Soula/31400 Toulouse/France (1 aut.); FLAIR, Department of Mechanical and Aerospace Engineering, Division of Biological Engineering, Monash University, Clayton Campus/Victoria 3800/Australie (2 aut.)
DT :	Publication en série; Congrès; Niveau analytique
SO :	Journal of fluids and structures; ISSN 0889-9746; Coden JFSTEF; Royaume-Uni; Da. 2008; Vol. 24; No. 8; Pp. 1194-1203; Bibl. 1/2 p.
LA :	Anglais
EA :	The flow resulting from the collision without rebound of generic bluff bodies with a wall in a still viscous fluid is investigated both computationally and experimentally. Emphasis is on the case of a circular cylinder impact (two-dimensional geometry), but comparisons with the flow generated by the impact of a sphere (axisymmetric geometry) are included. For normal cylinder impacts, the two counter-rotating vortices forming behind the body during its motion continue their trajectory towards the wall after the collision, leading to the generation of opposite-signed secondary vorticity at the cylinder and wall surfaces. Secondary vortices forming from this vorticity at higher Reynolds numbers exhibit a short-wavelength three-dimensional instability. Comparison with the sphere impact reveals significant differences in the scales of the vortices after the collision, due to the additional vortex stretching acting in the axisymmetric geometry. This leads to a delay in the onset of three-dimensionality and to a different instability mechanism. Oblique cylinder impacts are also considered. For increasing impact angles, the wall effect is gradually reduced on one side of the cylinder, which favours the roll-up of the secondary vorticity and increases the rebound height of the vortex system.
CC :	001B40G32; 001B40G27
FD :	Ecoulement instationnaire; Rebond; Incidence normale; Paire tourbillon; Effet paroi; Vorticité; Ecoulement tourbillonnaire; Nombre Reynolds; Etirement; Corps arête vive; Fluide visqueux; Cylindre circulaire; Sphère; Symétrie axiale; Longueur onde; Structure turbulence; Ecoulement bidimensionnel; Incidence oblique
ED :	Unsteady flow; Rebound; Normal incidence; Vortex pair; Wall effects; Vorticity; Vortex flow; Reynolds number; Stretching; Bluff body; Viscous fluids; Circular cylinder; Spheres; Axial symmetry; Wavelengths; Turbulence structure; Two dimensional flow; Oblique incidence
SD :	Rebote; Incidencia normal; Par vorticial; Estiramiento; Cuerpo arista viva; Cilindro circular; Estructura turbulencia; Flujo bidimensional; Incidencia oblicua
LO :	INIST-21394.354000184587870050
ID :	09-0137568

Links to Exploration step

Pascal:09-0137568

Le document en format XML

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<front><div type="abstract" xml:lang="en">The flow resulting from the collision without rebound of generic bluff bodies with a wall in a still viscous fluid is investigated both computationally and experimentally. Emphasis is on the case of a circular cylinder impact (two-dimensional geometry), but comparisons with the flow generated by the impact of a sphere (axisymmetric geometry) are included. For normal cylinder impacts, the two counter-rotating vortices forming behind the body during its motion continue their trajectory towards the wall after the collision, leading to the generation of opposite-signed secondary vorticity at the cylinder and wall surfaces. Secondary vortices forming from this vorticity at higher Reynolds numbers exhibit a short-wavelength three-dimensional instability. Comparison with the sphere impact reveals significant differences in the scales of the vortices after the collision, due to the additional vortex stretching acting in the axisymmetric geometry. This leads to a delay in the onset of three-dimensionality and to a different instability mechanism. Oblique cylinder impacts are also considered. For increasing impact angles, the wall effect is gradually reduced on one side of the cylinder, which favours the roll-up of the secondary vorticity and increases the rebound height of the vortex system.</div>
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<fA61><s0>A</s0>
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<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 flow resulting from the collision without rebound of generic bluff bodies with a wall in a still viscous fluid is investigated both computationally and experimentally. Emphasis is on the case of a circular cylinder impact (two-dimensional geometry), but comparisons with the flow generated by the impact of a sphere (axisymmetric geometry) are included. For normal cylinder impacts, the two counter-rotating vortices forming behind the body during its motion continue their trajectory towards the wall after the collision, leading to the generation of opposite-signed secondary vorticity at the cylinder and wall surfaces. Secondary vortices forming from this vorticity at higher Reynolds numbers exhibit a short-wavelength three-dimensional instability. Comparison with the sphere impact reveals significant differences in the scales of the vortices after the collision, due to the additional vortex stretching acting in the axisymmetric geometry. This leads to a delay in the onset of three-dimensionality and to a different instability mechanism. Oblique cylinder impacts are also considered. For increasing impact angles, the wall effect is gradually reduced on one side of the cylinder, which favours the roll-up of the secondary vorticity and increases the rebound height of the vortex system.</s0>
</fC01>
<fC02 i1="01" i2="3"><s0>001B40G32</s0>
</fC02>
<fC02 i1="02" i2="3"><s0>001B40G27</s0>
</fC02>
<fC03 i1="01" i2="3" l="FRE"><s0>Ecoulement instationnaire</s0>
<s5>06</s5>
</fC03>
<fC03 i1="01" i2="3" l="ENG"><s0>Unsteady flow</s0>
<s5>06</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE"><s0>Rebond</s0>
<s5>07</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG"><s0>Rebound</s0>
<s5>07</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA"><s0>Rebote</s0>
<s5>07</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE"><s0>Incidence normale</s0>
<s5>08</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG"><s0>Normal incidence</s0>
<s5>08</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA"><s0>Incidencia normal</s0>
<s5>08</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE"><s0>Paire tourbillon</s0>
<s5>09</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG"><s0>Vortex pair</s0>
<s5>09</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA"><s0>Par vorticial</s0>
<s5>09</s5>
</fC03>
<fC03 i1="05" i2="3" l="FRE"><s0>Effet paroi</s0>
<s5>10</s5>
</fC03>
<fC03 i1="05" i2="3" l="ENG"><s0>Wall effects</s0>
<s5>10</s5>
</fC03>
<fC03 i1="06" i2="3" l="FRE"><s0>Vorticité</s0>
<s5>11</s5>
</fC03>
<fC03 i1="06" i2="3" l="ENG"><s0>Vorticity</s0>
<s5>11</s5>
</fC03>
<fC03 i1="07" i2="3" l="FRE"><s0>Ecoulement tourbillonnaire</s0>
<s5>12</s5>
</fC03>
<fC03 i1="07" i2="3" l="ENG"><s0>Vortex flow</s0>
<s5>12</s5>
</fC03>
<fC03 i1="08" i2="3" l="FRE"><s0>Nombre Reynolds</s0>
<s5>13</s5>
</fC03>
<fC03 i1="08" i2="3" l="ENG"><s0>Reynolds number</s0>
<s5>13</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE"><s0>Etirement</s0>
<s5>14</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG"><s0>Stretching</s0>
<s5>14</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA"><s0>Estiramiento</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="3" l="FRE"><s0>Fluide visqueux</s0>
<s5>16</s5>
</fC03>
<fC03 i1="11" i2="3" l="ENG"><s0>Viscous fluids</s0>
<s5>16</s5>
</fC03>
<fC03 i1="12" i2="X" l="FRE"><s0>Cylindre circulaire</s0>
<s5>17</s5>
</fC03>
<fC03 i1="12" i2="X" l="ENG"><s0>Circular cylinder</s0>
<s5>17</s5>
</fC03>
<fC03 i1="12" i2="X" l="SPA"><s0>Cilindro circular</s0>
<s5>17</s5>
</fC03>
<fC03 i1="13" i2="3" l="FRE"><s0>Sphère</s0>
<s5>18</s5>
</fC03>
<fC03 i1="13" i2="3" l="ENG"><s0>Spheres</s0>
<s5>18</s5>
</fC03>
<fC03 i1="14" i2="3" l="FRE"><s0>Symétrie axiale</s0>
<s5>19</s5>
</fC03>
<fC03 i1="14" i2="3" l="ENG"><s0>Axial symmetry</s0>
<s5>19</s5>
</fC03>
<fC03 i1="15" i2="3" l="FRE"><s0>Longueur onde</s0>
<s5>20</s5>
</fC03>
<fC03 i1="15" i2="3" l="ENG"><s0>Wavelengths</s0>
<s5>20</s5>
</fC03>
<fC03 i1="16" i2="X" l="FRE"><s0>Structure turbulence</s0>
<s5>21</s5>
</fC03>
<fC03 i1="16" i2="X" l="ENG"><s0>Turbulence structure</s0>
<s5>21</s5>
</fC03>
<fC03 i1="16" i2="X" l="SPA"><s0>Estructura turbulencia</s0>
<s5>21</s5>
</fC03>
<fC03 i1="17" i2="X" l="FRE"><s0>Ecoulement bidimensionnel</s0>
<s5>22</s5>
</fC03>
<fC03 i1="17" i2="X" l="ENG"><s0>Two dimensional flow</s0>
<s5>22</s5>
</fC03>
<fC03 i1="17" i2="X" l="SPA"><s0>Flujo bidimensional</s0>
<s5>22</s5>
</fC03>
<fC03 i1="18" i2="X" l="FRE"><s0>Incidence oblique</s0>
<s5>41</s5>
</fC03>
<fC03 i1="18" i2="X" l="ENG"><s0>Oblique incidence</s0>
<s5>41</s5>
</fC03>
<fC03 i1="18" i2="X" l="SPA"><s0>Incidencia oblicua</s0>
<s5>41</s5>
</fC03>
<fN21><s1>096</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
</fN82>
</pA>
<pR><fA30 i1="01" i2="1" l="ENG"><s1>IUTAM symposium on Unsteady Separated Flows and their control</s1>
<s2>2</s2>
<s3>Corfu GRC</s3>
<s4>2007-06-18</s4>
</fA30>
</pR>
</standard>
<server><NO>PASCAL 09-0137568 INIST</NO>
<ET>Unsteady flow around impacting bluff bodies</ET>
<AU>LEWEKE (T.); SCHOUVEILER (L.); THOMPSON (M. C.); HOURIGAN (K.); BRAZA (Marianna); HOURIGAN (Kerry)</AU>
<AF>Institut de Recherche sur les Phénomènes Hors Équilibre ¯ CNRS, École Centrale, Aix-Marseille Université, 49 rue Frédéric Joliot-Curie, B.P. 146/13384 Marseille/France (1 aut., 2 aut.); Fluids Laboratory for Aeronautical and Industrial Research, Department of Mechanical and Aerospace Engineering, Monash University/Victoria 3800/Australie (3 aut., 4 aut.); Division of Biological Engineering, Monash University/Victoria 3800/Australie (4 aut.); Institut de Mécanique des Fluides, UMR-CNRS-No 5502, Allée du Prof. Camille Soula/31400 Toulouse/France (1 aut.); FLAIR, Department of Mechanical and Aerospace Engineering, Division of Biological Engineering, Monash University, Clayton Campus/Victoria 3800/Australie (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. 2008; Vol. 24; No. 8; Pp. 1194-1203; Bibl. 1/2 p.</SO>
<LA>Anglais</LA>
<EA>The flow resulting from the collision without rebound of generic bluff bodies with a wall in a still viscous fluid is investigated both computationally and experimentally. Emphasis is on the case of a circular cylinder impact (two-dimensional geometry), but comparisons with the flow generated by the impact of a sphere (axisymmetric geometry) are included. For normal cylinder impacts, the two counter-rotating vortices forming behind the body during its motion continue their trajectory towards the wall after the collision, leading to the generation of opposite-signed secondary vorticity at the cylinder and wall surfaces. Secondary vortices forming from this vorticity at higher Reynolds numbers exhibit a short-wavelength three-dimensional instability. Comparison with the sphere impact reveals significant differences in the scales of the vortices after the collision, due to the additional vortex stretching acting in the axisymmetric geometry. This leads to a delay in the onset of three-dimensionality and to a different instability mechanism. Oblique cylinder impacts are also considered. For increasing impact angles, the wall effect is gradually reduced on one side of the cylinder, which favours the roll-up of the secondary vorticity and increases the rebound height of the vortex system.</EA>
<CC>001B40G32; 001B40G27</CC>
<FD>Ecoulement instationnaire; Rebond; Incidence normale; Paire tourbillon; Effet paroi; Vorticité; Ecoulement tourbillonnaire; Nombre Reynolds; Etirement; Corps arête vive; Fluide visqueux; Cylindre circulaire; Sphère; Symétrie axiale; Longueur onde; Structure turbulence; Ecoulement bidimensionnel; Incidence oblique</FD>
<ED>Unsteady flow; Rebound; Normal incidence; Vortex pair; Wall effects; Vorticity; Vortex flow; Reynolds number; Stretching; Bluff body; Viscous fluids; Circular cylinder; Spheres; Axial symmetry; Wavelengths; Turbulence structure; Two dimensional flow; Oblique incidence</ED>
<SD>Rebote; Incidencia normal; Par vorticial; Estiramiento; Cuerpo arista viva; Cilindro circular; Estructura turbulencia; Flujo bidimensional; Incidencia oblicua</SD>
<LO>INIST-21394.354000184587870050</LO>
<ID>09-0137568</ID>
</server>
</inist>
</record>

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Unsteady flow around impacting bluff bodies

Unsteady flow around impacting bluff bodies

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