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Characteristics of the near wake of a cylinder at low Reynolds numbers

Identifieur interne : 00D430 ( Main/Merge ); précédent : 00D429; suivant : 00D431

Characteristics of the near wake of a cylinder at low Reynolds numbers

Auteurs : P. Paranthoën [France] ; L. W. B. Browne [Australie] ; S. Le Masson [France] ; F. Dumouchel [France] ; J. C. Lecordier [France]

Source :

European Journal of Mechanics / B Fluids [ 0997-7546 ] ; 1999.

RBID : ISTEX:709493AF454A757761F5240A1DCF7F4448D51CBB

English descriptors

Abstract

Abstract: An experimental study has been made of the near wake of two two-dimensional bluff bodies, a circular cylinder and a flat ribbon in the regimes corresponding to the 2-D steady and 2-D periodic wake. Velocity measurements from both hot-wire and laser Doppler anemometry are compared. Detailed measurements of the velocity field in air in the near wake, in isothermal conditions, are presented. The evolutions of the mean longitudinal velocity and the rms transverse velocity fluctuation on the center line can be plotted in a universal form whatever the value of the Reynolds number. These measurements show also that the onset of the instability is related to a critical value of an interaction term characteristic of the strength of the shear layers and the shear layer spacing at the end of the recirculation zone.

Url:

https://api.istex.fr/document/709493AF454A757761F5240A1DCF7F4448D51CBB/fulltext/pdf

DOI: 10.1016/S0997-7546(99)00105-3

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ISTEX:709493AF454A757761F5240A1DCF7F4448D51CBB

Le document en format XML

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<term>Circular cylinders</term>
<term>Critical length</term>
<term>Critical reynolds number</term>
<term>Cylinder wake</term>
<term>Dimensionless</term>
<term>Dimensionless evolution</term>
<term>Dimensionless form</term>
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<term>Exponent</term>
<term>Fluid mech</term>
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<term>Kovasznay</term>
<term>Longitudinal</term>
<term>Longitudinal evolution</term>
<term>Longitudinal velocities</term>
<term>Longitudinal velocity</term>
<term>Maximum value</term>
<term>Mech</term>
<term>Periodic wake</term>
<term>Recirculation</term>
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<term>Reynolds number</term>
<term>Reynolds numbers</term>
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<term>Transverse velocity</term>
<term>Velocity distributions</term>
<term>Velocity gradient</term>
<term>Velocity measurements</term>
<term>Vortex</term>
<term>Wave length</term>
<term>Xmax</term>
<term>Xmax decreases</term>
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<term>Dimensionless form</term>
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<term>Fluid mech</term>
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<front><div type="abstract" xml:lang="en">Abstract: An experimental study has been made of the near wake of two two-dimensional bluff bodies, a circular cylinder and a flat ribbon in the regimes corresponding to the 2-D steady and 2-D periodic wake. Velocity measurements from both hot-wire and laser Doppler anemometry are compared. Detailed measurements of the velocity field in air in the near wake, in isothermal conditions, are presented. The evolutions of the mean longitudinal velocity and the rms transverse velocity fluctuation on the center line can be plotted in a universal form whatever the value of the Reynolds number. These measurements show also that the onset of the instability is related to a critical value of an interaction term characteristic of the strength of the shear layers and the shear layer spacing at the end of the recirculation zone.</div>
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Characteristics of the near wake of a cylinder at low Reynolds numbers

Characteristics of the near wake of a cylinder at low Reynolds numbers

Source :

English descriptors

Abstract

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