On the formation and suppression of vortex 'shedding' at low Reynolds numbers.

P. J. Strykowski, K. R. Sreenivasan

Research output: Contribution to journalArticle

Abstract

Discusses the suppression or control of vortex shedding behind circular cylinders over a limited range of Reynolds numbers by proper placement of a second, smaller, cylinder in the near wake of the main cylinder. Results of experimental wind tunnel investigations, flow visualization tests and numerical simulation are outlined. Temporal growth rate measurements of velocity fluctuations reveal the smaller cylinder reduces the growth rate of the disturbance leading to vortex shedding. It is argued that the secondary cylinder has the effect of altering the local stability of the flow by smearing and diffusing concentrated vorticity in the shear layers behind the body. A unified explanation of this phenomenon is attempted, and it is suggested that the vortex shedding is associated with temporally unstable eigenmodes which are heavily weighted in the near field. It is also shown that the absolute instability is relevant in explaining vortex shedding whose suppression can similarly be associated with altering the instability in the near wake region from absolute to convective. (from authors' abstract)

Original languageEnglish (US)
Journal[No source information available]
StatePublished - Jan 1 1990

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vortex shedding
Vortex shedding
low Reynolds number
Reynolds number
retarding
near wakes
flow visualization
shear layers
wind tunnels
circular cylinders
Flow visualization
Circular cylinders
Vorticity
vorticity
Wind tunnels
near fields
disturbances
Computer simulation
simulation

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

On the formation and suppression of vortex 'shedding' at low Reynolds numbers. / Strykowski, P. J.; Sreenivasan, K. R.

In: [No source information available], 01.01.1990.

Research output: Contribution to journalArticle

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