Active control of flow-induced vibration from bluff-body wakes: The response of an elastically-mounted cylinder to rotational forcing

J. S. Leontini, M. C. Thompson

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This paper investigates the flow past an elastically-mounted cylinder, constrained to oscillate in the cross-stream direction, which is then externally forced to perform rotational oscillations. The motivation for this study is the enhancement of crossstream oscillations of the body. These oscillations can be used to drive a generator, and therefore used as a renewable energy technology. More generally, this forcing is treated as an openloop control strategy of the wake and the resulting cylinder oscillations. The system tested is such that its natural structural frequency, fn, is close to the vortex shedding frequency from a stationary cylinder. This means that with no forcing, the cylinder oscillations, and the periodic vortex shedding that characterizes the wake, are synchronized. Numerical simulations have been conducted for a range of forcing frequencies fn/2leqslant fd ≤ 2 fn, and the effect of the forcing on this base, synchronized case determined. It is shown that the forcing can significantly increase the peak oscillation amplitude, and that the wake and cylinder cross-stream oscillation remains synchronized to the rotational driving over a significant range of driving frequencies. Outside of this synchronized range, the flow is shown to be typically quasiperiodic, with modulated oscillations around the system natural structural frequency.

Original languageEnglish
Title of host publicationProceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012
Subtitle of host publicationLaunceston, Australia, 3-7 December, 2012
Editors P.A. Brandner, B.W. Pearce
PublisherAustralasian Fluid Mechanics Society
Number of pages4
ISBN (Electronic)9780646583730
Publication statusPublished - 2012
EventAustralasian Fluid Mechanics Conference 2012 - University of Tasmania (Newnham Campus), Launceston, Australia
Duration: 3 Dec 20127 Dec 2012
Conference number: 18th


ConferenceAustralasian Fluid Mechanics Conference 2012
Abbreviated titleAFMC 2012
OtherThe 18th AFMC is to be the 1st of a series which will be held every 2 years by The Australasian Fluid Mechanics Society.
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