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Three-dimensional vortex formation from an oscillating, non-uniform cylinder

Published online by Cambridge University Press:  26 April 2006

F. Nuzzi ,
C. Magness  and
D. Rockwell
F. Nuzzi
Affiliation:
Department of Mechanical Engineering and Mechanics, 354 Packard Laboratory 19, Lehigh University, Bethlehem, PA 18015, USA
C. Magness
Affiliation:
Department of Mechanical Engineering and Mechanics, 354 Packard Laboratory 19, Lehigh University, Bethlehem, PA 18015, USA
D. Rockwell
Affiliation:
Department of Mechanical Engineering and Mechanics, 354 Packard Laboratory 19, Lehigh University, Bethlehem, PA 18015, USA
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Abstract

A cylinder having mild variations in diameter along its span is subjected to controlled excitation at frequencies above and below the inherent shedding frequency from the corresponding two-dimensional cylinder. The response of the near wake is characterized in terms of timeline visualization and velocity traces, spectra, and phase plane representations. It is possible to generate several types of vortex formation, depending upon the excitation frequency. Globally locked-in, three-dimensional vortex formation can occur along the entire span of the flow. Regions of locally locked-in and period-doubled vortex formation can exist along different portions of the span provided the excitation frequency is properly tuned. Unlike the classical subharmonic instability in free shear flows, the occurrence of period-doubled vortex formation does not involve vortex coalescence; instead, the flow structure alternates between two different states.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 238 , May 1992 , pp. 31 - 54
Copyright
© 1992 Cambridge University Press

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