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The effect of free-stream turbulence on sectional lift forces on a circular cylinder

Published online by Cambridge University Press:  26 April 2006

H. M. Blackburn  and
W. H. Melbourne
H. M. Blackburn
Affiliation:
Department of Mechanical Engineering, Monash University, Clayton, Victoria 3168, Australia Current address: CSIRO, Division of Building, Construction and Engineering, PO Box 56, Highett, Victoria 3190, Australia.
W. H. Melbourne
Affiliation:
Department of Mechanical Engineering, Monash University, Clayton, Victoria 3168, Australia
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Abstract

Wind-tunnel experiments were conducted to examine the effect of grid-generated turbulence on lift forces at sections of a circular cylinder. Turbulence of longitudinal intensity between 0.6% and 18% was employed, with cylinder Reynolds numbers in the range 1 × 105 to 5 × 105. Addition of low-intensity turbulence had the primary effect of inducing the critical transition at Reynolds numbers below that for smooth flow; above transition there was little difference between the forces experienced by the cylinder in smooth or turbulent flow, with no sign of organized vortex shedding.

At higher turbulence intensities effects consistent with a return to organized vortex shedding were observed, particularly for the highest intensity and at the upper end of the Reynolds number range; lift coefficients were greater than in smooth supercritical flow, with a broad spectral peak centred near a Strouhal number of 0.23 accompanied by an increase in spanwise correlation lengths of lift force.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 306 , 10 January 1996 , pp. 267 - 292
Copyright
© 1996 Cambridge University Press

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