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Chaotic rotation of a towed elliptical cylinder

Published online by Cambridge University Press:  06 March 2014

G. D. Weymouth
G. D. Weymouth*
Affiliation:
Southampton Marine and Maritime Institute, University of Southampton, Southampton SO17 1BJ, UK
*
†Email address for correspondence: G.D.Weymouth@soton.ac.uk
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Abstract

In this paper I consider the self-excited rotation of an elliptical cylinder towed in a viscous fluid as a canonical model of nonlinear fluid–structure interactions with possible applications in the design of sensors and energy extraction devices. First, the self-excited ellipse system is shown to be analogous to the forced bistable oscillators studied in classic chaos theory. A single variable, the distance between the pivot and the centroid, governs the system bifurcation into bistability. Next, fully coupled computational fluid dynamics simulations of the motion of the cylinder demonstrate limit cycle, period doubling, intermittently chaotic and fully chaotic dynamics as the distance is further adjusted. The viscous wake behind the cylinder is presented for the limit-cycle cases and new types of stable wakes are characterized for each. In contrast, a chaotic case demonstrates an independence of the wake and structural states. The rotational kinetic energy is quantified and correlated to the vortex shedding and the trajectory periodicity. Chaotic and high-period system responses are found to persist when structural damping is applied and for Reynolds numbers as low as 200.

JFM classification

Aerodynamics: Flow-structure interactions Nonlinear Dynamical Systems: Nonlinear Dynamical Systems Vortex Flows: Vortex shedding
Type
Papers
Information
Journal of Fluid Mechanics , Volume 743 , 25 March 2014 , pp. 385 - 398
Copyright
© 2014 Cambridge University Press 

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Weymouth supplementary movie

Limit cycle rotation of a towed elliptical cylinder

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Weymouth supplementary movie

Chaotic rotation of a towed elliptical cylinder

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Video 3.8 MB