The Existence of Two Stages in the Transition to Three-Dimensionality of a Cylinder Wake

Abstract

The transition to three-dimensionality in the near wake of a circular cylinder involves two successive transitions, each of which corresponds with a discontinuity in the Strouhal-Reynolds number relationship. The first discontinuity BETWEEN Reynolds numbers (Re) of 170 to 180 is associated with the inception of vortex loops, and it is hysteretic. The second discontinuity (between Re=230 to 260) corresponds with a change to a finer-scale streamwise vortex structure. At this discontinuity there is no hysteresis, and it is suggested that two modes of vortex shedding alternate in time.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1988
Accession Number
ADA205539

Entities

People

  • C. H. Williamson

Organizations

  • California Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Aeronautical Laboratories
  • Demographic Cohorts
  • Diameters
  • Discontinuities
  • Flow
  • Flow Visualization
  • Fluid Flow
  • Frequency
  • Hot Wire
  • Reynolds Number
  • Spectra
  • Strouhal Number
  • Three Dimensional
  • Transitions
  • Turbulent Mixing
  • Vortex Shedding
  • Vortices

Fields of Study

  • Physics

Readers

  • Control Systems Engineering.
  • Fluid Mechanics and Fluid Dynamics.