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

B. Stewart, J. Leontini, K. Hourigan, M. C. Thompson

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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DOI: http://dx.doi.org/10.21914/anziamj.v46i0.955



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ANZIAM Journal, ISSN 1446-8735, copyright Australian Mathematical Society.