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ANZIAM J. 46(E) ppC181--C195, 2005.

Vortex wake and energy transitions of an oscillating cylinder at low Reynolds number

B. Stewart

J. Leontini

K. Hourigan

M. C. Thompson

(Received 25 October 2004, revised 15 February 2005)

Abstract

To better understand vortex-induced vibration at low Reynolds number, a two-dimensional numerical study of the forced oscillation of a cylinder in cross-flow was undertaken. The Karman vortex shedding mode (2S) of the forced oscillation of a cylinder in cross-flow incorporated a gradual change from positive to negative energy transfer with increasing amplitude of motion. As amplitude was increased, the 2S shedding mode evolved into an asymmetric mode of shedding in which a pair and a single vortex (P+S) were shed each motion cycle. Energy contours were established in the region of primary lock-in and the boundary of zero energy transfer was defined. The observed P+S mode only occurred in the region of negative energy transfer.

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Authors

B. Stewart

J. Leontini

K. Hourigan

M. C. Thompson

Fluids Laboratory for Aeronautical and Industrial Research, Dept. Mechanical Engineering, Monash University, Melbourne, Australia. mailto:kerry.hourigan@eng.monash.edu.au

Published April 22, 2005. ISSN 1446-8735

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