Unsteady Pulsing of Cylinder Wakes

  • D. R. Williams
  • C. W. Amato
Part of the Lecture Notes in Engineering book series (LNENG, volume 46)

Abstract

An overview of recent progress in modelling the behavior of low Reynolds number cylinder wakes is presented. The discussion examines ways in which unsteady forcing has been used to test hypotheses and to control the behavior of the wake. hi addition to the review a new method of reducing the wake momentum defect using pulsating jets is demonstrated for flow around a circular cylinder at a Reynolds number of 370. The line of pulsating jets is embedded in the trailing generator of the cylinder. There is no net mass added by the pulsating jets on an average over the cycle, but there is net momentum addition to the flow by the second-order streaming effect. The jets are most effective in modifying the wake when pulsating at twice the Karman shedding frequency. The streaming flow generated by the pulsation suppresses the Karman vortex street and reduces the momentum defect.

Keywords

Vortex Dust Torque Attenuation Vorticity 

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Copyright information

© Springer-Verlag Berlin, Heidelberg 1989

Authors and Affiliations

  • D. R. Williams
    • 1
  • C. W. Amato
    • 1
  1. 1.Fluid Dynamics Research CenterIllinois Institute of TechnologyChicagoUSA

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