One degree-of-freedom vortex-induced vibrations at constant Reynolds number and mass-damping

Free vibration experiments of a circular cylinder undergoing vortex-induced vibrations are performed using a cyber–physical system. Amplitude, force and frequency response measurements for four cases of constant mass-damping ( m ∗ ζ ) at a constant Reynolds number ( R e = U ∞ D / ν ) of 4000 are pre...

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Bibliographic Details
Published inExperiments in fluids Vol. 59; no. 10; pp. 1 - 16
Main Authors Riches, Graham, Morton, Chris
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.10.2018
Springer Nature B.V
Subjects
Amplitudes
Circular cylinders
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Fluid flow
Fluid- and Aerodynamics
Free vibration
Frequency response
Heat and Mass Transfer
Mathematical analysis
Research Article
Reynolds number
Vibration damping
Vortex-induced vibrations
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Summary:Free vibration experiments of a circular cylinder undergoing vortex-induced vibrations are performed using a cyber–physical system. Amplitude, force and frequency response measurements for four cases of constant mass-damping ( m ∗ ζ ) at a constant Reynolds number ( R e = U ∞ D / ν ) of 4000 are presented and compared to the literature values. The results show that mass ratio ( m ∗ ) is the dominant parameter governing the response in the initial branch, while m ∗ ζ governs the amplitude response in the lower branch and desynchronization regions. In the upper branch, the Reynolds number and m ∗ ζ both strongly affect the amplitude response. Following a decomposition of the total hydrodynamic force into added mass and circulatory components, it is shown that the circulatory force is strongly related to m ∗ in the initial branch, and m ∗ ζ in the upper and lower branches. The total force is found to be insensitive to changes in m ∗ and m ∗ ζ in the lower branch and desynchronization regions. An analysis of the extent of amplitude modulations is performed by comparing the amplitude response calculated by the highest 10 % of peaks method and the mean of all peaks method. The results indicate that lower structural damping values lead to larger modulations in the initial and upper branch regions regardless of m ∗ . Graphical abstract
ISSN:0723-4864
1432-1114
DOI:10.1007/s00348-018-2603-3