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Streamwise forced oscillations of circular and square cylinders

Tudball-Smith, Daniel and Leontini, Justin S. and Sheridan, John and Lo Jacono, David Streamwise forced oscillations of circular and square cylinders. (2012) Physics of Fluids (n° 111703). ISSN 1070-6631

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Official URL: http://dx.doi.org/10.1063/1.4758286

Abstract

The modification of a cylinder wake by streamwise oscillation of the cylinder at the vortex shedding frequency of the unperturbed cylinder is reported. Recent numerical simulations [J. S. Leontini, D. Lo Jacono, and M. C. Thompson, “A numerical study of an inline oscillating cylinder in a free stream,” J. Fluid Mech. 688, 551–568 (2011)] showed that this forcing results in the primary frequency decreasing proportionally to the square of the forcing amplitude, before locking to a subharmonic at higher amplitudes. The experimental results presented here show that this behavior continues at higher Reynolds numbers, although the flow is three-dimensional. In addition, it is shown that this behavior persists when the body is a square cross section, and when the frequency of forcing is detuned from the unperturbed cylinder shedding frequency. The similarity of the results across Reynolds number, geometry, and frequency suggests that the physical mechanism is applicable to periodic forcing of the classic von Ka ́rma ́n vortex street, regardless of the details of the body which forms the street.

Item Type:Article
Additional Information:Thanks to American Institute of Physics editor. The definitive version is available at http://dx.doi.org/10.1063/1.4758286
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: David LO JACONO

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