The Effect of Free Stream Turbulence on a Circular Cylinder for Various Aspect Ratios

  • S. Szepessy
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)

Abstract

Experiments have been carried to investigate the effect of free stream turbulence on fluctuating lift forces and spanwise vortex shedding correlation of a circular cylinder at Reynolds numbers between 6x103<Re<4.6x104, and aspect ratio 0.25<L/d<11. Turbulence generating grids were used that produced a maximum turbulence intensity of 6.7% and a longitudinal length scale ranging 0.6<Λx/d<1.1. Attention is focused on the difference between small and large cylinder aspect ratio. The effect of oncoming turbulence was found to be larger at small L/d.

Keywords

Vortex Cross Correlation Ozono 

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Bearman P.W., Morel T.: Effect of free stream turbulence on the flow around bluff bodies. Prog Aero Sci., 20, (1983), 97–123CrossRefGoogle Scholar
  2. 2.
    Bruun H.H, Davies P.O.A.L.: An experimental investigation of the unsteady pressure forces on a circular cylinder in a turbulent cross flow. J. Sound Vibr., 40 (4), (1975), 535–559ADSCrossRefGoogle Scholar
  3. 3.
    Cheung J.C.K., Melbourne W.H.: Turbulence effects on some aerodynamic parameters of a circular cylinder at supercritical Reynolds numbers, J Wind Engng Ind. Aero, 14, (1983), 399–410CrossRefGoogle Scholar
  4. 4.
    Leehey P., Hanson C.E.: Aeolian tones associated with resonant vibration, J. Sound Vibr., 13 (4), (1971), 465–483ADSCrossRefGoogle Scholar
  5. 5.
    Nakamura Y., Ohya Y., Ozono S.: The effects of turbulence on bluff body mean flow. J Wind Engng Ind. Aero, 28, (1988), 251–259CrossRefGoogle Scholar
  6. 6.
    Norberg C.: Reynolds number and free stream turbulence effects on the flow and fluid forces for a circular cylinder in cross flow, PhD Thesis, Dept. Thermo-Fluid Dyn., Chalmers University of Technology, Gothenburg, Sweden, 1987Google Scholar
  7. 7.
    Sonneville P.: Étude de la structure tridemensionelle des écoulements autour dun cylindre circulaire. Bulletin de la direction des etudes et recherches, serie A (3), (1976), (in french). Study of the three-dimensional structure of flow round a circular cylinderGoogle Scholar
  8. 8.
    Surry D.: Some effects of intense turbulence on the aerodynamics of a circular cylinder at subcritical Reynolds number. J. Fluid Mech., 52 (3), (1972), 543–563ADSCrossRefGoogle Scholar
  9. 9.
    Szepessy S., Bearman P.W., Aspect ratio and end plate effects on vortex shedding from a circular cylinder, J. Fluid Mech., 234, (1992), 191–217ADSCrossRefGoogle Scholar
  10. 10.
    Szepessy S., Bearman P.W.: Analysis of a pressure averaging device for measuring aerodynamic forces on a bluff body, to be submitted to Exp Fluids, 1992Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1993

Authors and Affiliations

  • S. Szepessy
    • 1
  1. 1.Department of HydromechanicsUniversity of KarlsruheKarlsruheGermany

Personalised recommendations