Dual-frequency vortex-induced vibrations of long flexible stepped cylinders
Name
075105_1_online.pdf
Description
Published version
Size
8.15 MB
Format
Adobe PDF
Checksum (MD5)
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Author(s)
Li, Ang
Mentzelopoulos, Andreas
Triantafyllou, Michael S.
Fan, Dixia
Date Issued
July 1, 2022
Journal
Physics of Fluids
Publisher
AIP Publishing
Citation
Ang Li, Andreas Mentzelopoulos, Michael S. Triantafyllou, Dixia Fan; Dual-frequency vortex-induced vibrations of long flexible stepped cylinders. Physics of Fluids 1 July 2022; 34 (7): 075105.
Version
Final published version
Abstract
Flexible structures within a non-uniform inflow may undergo complex vortex-induced vibrations (VIV) containing multiple frequencies and vibration modes. Therefore, the critical question arises on whether and how a flexible cylinder's structural response and fluid forces undergoing multi-frequency vibrations resemble or differ from mono-frequency vibrations. Therefore, we experimentally studied the problem of dual-frequency VIV of a stepped flexible cylinder, viz., a large-aspect ratio flexible cylinder consisting of two segments with different diameters and rigid cylinder forced vibration experiments. The results show that the maximum in-line (IL) and cross-flow (CF) displacements and the frequency ratio of the stepped cylinder separated by individual frequency resemble those of a uniform cylinder vibrating in the uniform flow at a single frequency. In addition, it is found that forced vibration results from rigid cylinders undergoing multi-frequency IL and CF motion can improve the prediction of the multi-frequency flexible cylinder VIV, provided the amplitudes and phases, as well as the true reduced velocity Vr for each of the dual frequencies match, especially when Vr∈[4,8].
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1063/5.0098391
