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Vortex-induced vibrations of a low mass-damping rigid circular cylinder with forced periodic rotations

F. J. Huera-Huarte

  • Department of Mechanical Engineering, Universitat Rovira i Virgili (URV), 43007 Tarragona, Spain

Phys. Rev. Fluids 5, 124701 – Published 9 December, 2020

DOI: https://doi.org/10.1103/PhysRevFluids.5.124701

Abstract

The one-degree-of-freedom vortex-induced vibrations (VIVs) of a low mass-damping circular cylinder forced to vibrate periodically have been investigated experimentally. A specially designed cylinder model allowed us to generate rotational oscillations while the system was responding to VIVs. Variations in the amplitude and frequency response have been studied, together with the excitation on the system. For dimensionless frequencies smaller than those of the response, rotations had little effect on the dynamics of the system. Otherwise, the dynamic response of the cylinder was in general reduced if compared to the nonrotating case, especially when forcing frequencies were larger than the VIV responding frequency under locked-in conditions. The very minor changes observed in the wake structures indicated that the VIV motion dominated the vortex formation process instead of the periodic forcing.

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