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A numerical study of an inline oscillating cylinder in a free stream

Leontini, Justin S. and Lo Jacono, David and Thompson, Mark C. A numerical study of an inline oscillating cylinder in a free stream. (2011) Journal of Fluid Mechanics, vol. 688 . pp. 551-568. ISSN 0022-1120

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Official URL: http://dx.doi.org/doi:10.1017/jfm.2011.403

Abstract

Simulations of a cylinder undergoing externally controlled sinusoidal oscillations in the free stream direction have been performed. The frequency of oscillation was kept equal to the vortex shedding frequency from a fixed cylinder, while the amplitude of oscillation was varied, and the response of the flow measured. With varying amplitude, a rich series of dynamic responses was recorded. With increasing amplitude, these states included wakes similar to the Kármán vortex street, quasiperiodic oscillations interleaved with regions of synchronized periodicity (periodic on multiple oscillation cycles), a period-doubled state and chaotic oscillations. It is hypothesized that, for low to moderate amplitudes, the wake dynamics are controlled by vortex shedding at a global frequency, modified by the oscillation. This vortex shedding is frequency modulated by the driven oscillation and amplitude modulated by vortex interaction. Data are presented to support this hypothesis.

Item Type:Article
Additional Information:Thanks to Cambridge University Press editor. The definitive version of this article is available at :http://dx.doi.org/doi:10.1017/jfm.2011.403
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Monash University (AUSTRALIA)
Laboratory name:
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Deposited By: Catherine THURIOT

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