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Vortex-induced vibration of a transversely rotating sphere

Sareen, Anchal and Zhao, Jisheng and Lo Jacono, David and Sheridan, John and Hourigan, Kerry and Thompson, Mark C. Vortex-induced vibration of a transversely rotating sphere. (2016) In: 20th Australasian Fluid Mechanics Conference, 5 December 2016 - 8 December 2016 (Perth, Australia). (Unpublished)

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Abstract

Vortex-induced vibration (VIV) of a sphere is one of the most basic fluid-structure interaction problems. Since such vibrations can lead to fatal structural failures, numerous studies have focused on suppressing such flow-induced vibrations. In this study, for the first time, the effect of an imposed transverse rotation on the dynamics of the VIV of an elastically mounted sphere has been investigated. It was observed that the non-dimensional vibration amplitude for a rotating sphere (A∗ = √2yrms/D, where yrms is the root mean square of the displacement in the transverse direction and D = sphere diameter) exhibits a bell-shaped evolution as a function of reduced velocity, similar to the classic VIV response of a non-rotating sphere. The sphere is found to oscillate freely up to a rotation ratio α (ratio of the equatorial velocity of the sphere to the free-stream velocity) close to 0.5. For lower rotation ratios (α ≤ 0.3), the response looks similar to the non-rotating case but with slightly smaller vibration amplitude. For higher α values, the amplitude was found to decrease significantly with the rotation up to α = 0.5. The amplitude dropped drastically after it reached the peak amplitude. This is unlike the VIV response of a rotating circular cylinder where the vibration amplitude increases up to three times the maximum vibration amplitude in the non- rotating case due to a novel asymmetric wake pattern (see [1])

Item Type:Conference or Workshop Item (Paper)
Audience (journal):International peer-reviewed journal
Audience (conference):International conference without published proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Monash University (AUSTRALIA)
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Deposited On:14 Mar 2018 14:09

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