Characteristics of the near wake of a cylinder at low Reynolds numbers
Identifieur interne : 00D430 ( Main/Merge ); précédent : 00D429; suivant : 00D431Characteristics 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.
English descriptors
- KwdEn :
- Bluff bodies, Bluff body, Center line, Circular cylinder, Circular cylinders, Critical length, Critical reynolds number, Cylinder wake, Dimensionless, Dimensionless evolution, Dimensionless form, European journal, Exponent, Fluid mech, Gure, Interaction term, Kovasznay, Longitudinal, Longitudinal evolution, Longitudinal velocities, Longitudinal velocity, Maximum value, Mech, Periodic wake, Recirculation, Recirculation zone, Reynolds, Reynolds number, Reynolds numbers, Shear layer, Shear layer spacing, Shear layer thickness, Shear layers, Threshold difference, Transverse velocities, Transverse velocity, Velocity distributions, Velocity gradient, Velocity measurements, Vortex, Wave length, Xmax, Xmax decreases.
- Teeft :
- Bluff bodies, Bluff body, Center line, Circular cylinder, Circular cylinders, Critical length, Critical reynolds number, Cylinder wake, Dimensionless, Dimensionless evolution, Dimensionless form, European journal, Exponent, Fluid mech, Gure, Interaction term, Kovasznay, Longitudinal, Longitudinal evolution, Longitudinal velocities, Longitudinal velocity, Maximum value, Mech, Periodic wake, Recirculation, Recirculation zone, Reynolds, Reynolds number, Reynolds numbers, Shear layer, Shear layer spacing, Shear layer thickness, Shear layers, Threshold difference, Transverse velocities, Transverse velocity, Velocity distributions, Velocity gradient, Velocity measurements, Vortex, Wave length, Xmax, Xmax decreases.
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:
DOI: 10.1016/S0997-7546(99)00105-3
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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>Fluid mech</term>
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<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>
<term>Recirculation zone</term>
<term>Reynolds</term>
<term>Reynolds number</term>
<term>Reynolds numbers</term>
<term>Shear layer</term>
<term>Shear layer spacing</term>
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<term>Threshold difference</term>
<term>Transverse velocities</term>
<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 evolution</term>
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<term>Gure</term>
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<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>
<term>Recirculation zone</term>
<term>Reynolds</term>
<term>Reynolds number</term>
<term>Reynolds numbers</term>
<term>Shear layer</term>
<term>Shear layer spacing</term>
<term>Shear layer thickness</term>
<term>Shear layers</term>
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<term>Transverse velocities</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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