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Invariance of CDST in the Turbulent Wake of Bluff Bodies

[+] Author Affiliations
J. C. Hu, Y. Zhou, J. F. Huang

Hong Kong Polytechnic University, Kowloon, Hong Kong

Paper No. FEDSM2005-77046, pp. 447-453; 7 pages
  • ASME 2005 Fluids Engineering Division Summer Meeting
  • Volume 1: Symposia, Parts A and B
  • Houston, Texas, USA, June 19–23, 2005
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-4198-7 | eISBN: 0-7918-3760-2
  • Copyright © 2005 by ASME


The inter-relationship of drag coefficient Cd and Strouhal number St in a turbulent wake was experimentally investigated for ten cylinders of the same characteristic height d but of different cross-sections at Re = 2600 and 6000, based on the freestream velocity U∞ and d. It is found that, although Cd and St depend strongly on the geometric cross-section of the cylinder, the product of Cd St is invariant, about 0.25, under present experimental conditions. This invariance of Cd St is further confirmed with respect to Re and angle of attack of a square cylinder based on a collection of data in the literature. It is further found that Cd St is actually the ratio of the dimensionless work done upon the fluid by the cylinder to the dimensionless wavelength.

Copyright © 2005 by ASME
Topics: Wake turbulence



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