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

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 t...

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Bibliographic Details
Published in:Physics of fluids (1994) 2009-10, Vol.21 (10), p.101705-101705-3
Main Authors: Perdikaris, Paris G., Kaiktsis, Lambros, Triantafyllou, George S.
Format: Article
Language:English
Subjects:
Chaos
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Physics
Rotational flow and vorticity
Separated flows
Solid mechanics
Structural and continuum mechanics
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
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Summary: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.
ISSN:1070-6631
1089-7666
DOI:10.1063/1.3258287