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Chaos in a cylinder wake due to forcing at the Strouhal frequency

Phys. Fluids 21, 101705 (2009); doi:10.1063/1.3258287

Published 29 October 2009

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Paris G. Perdikaris, Lambros Kaiktsis, and George S. Triantafyllou
Department of Naval Architecture and Marine Engineering, National Technical University of Athens, Athens 15773, Greece
In this letter we show that a cylinder oscillating harmonically in line with an incoming flow at a frequency equal to the natural frequency of vortex shedding induces for certain amplitudes of oscillation a chaotic state in the flow, characterized by an aperiodic lift force. The result is obtained through numerical simulation of the Navier–Stokes equations for two-dimensional flow. The chaos is attributed to the competition between two modes: the natural mode of the wake and the mode forced by the moving cylinder, which have entirely different spatial structures. ©2009 American Institute of Physics
History: Received 23 July 2009; accepted 7 October 2009; published 29 October 2009
Permalink: http://link.aip.org/link/?PHFLE6/21/101705/1
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ISSN:
1070-6631 (print)   1089-7666 (online)
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REFERENCES (8)
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