Experimental investigation of downstream cylinder vibrations caused by FIV in the presence of upstream stationary cylinder

Praveen B M, N and Avula, Venkata Ramana (2022) Experimental investigation of downstream cylinder vibrations caused by FIV in the presence of upstream stationary cylinder. Marine Structures, 82. pp. 1-17. ISSN 0951-8339

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The mechanism of flow induced vibrations (FIV) exists in many engineering applications and plays a significant role. In offshore engineering, the risers subjected to flow induced vibrations. In this study, two circular cylinders of different diameters are arranged in tandem manner. In cross-flow transverse direction, the upstream cylinder is fixed, while the downstream cylinder is subjected to vibrations. This study carries out experiments in wind tunnel, which focuses on significant vibration-galloping. Variable mass-damping ratio is used to achieve the critical velocity corresponding to onset galloping vibration. In the present study, the diameter ratio is 0.4 and the gap L is 1.5D, and 3.5D. In the wind tunnel experiments, by changing the mass of the vibrating cylinder, the corresponding values of damping ratio, results in variable mass damping ratio m*ζ. For each value of m*ζ, the amplitude, frequency at every reduced velocity will be obtained at first, the critical velocity and stability map will be summarized. At static area between lock-in and galloping (desynchronization branch), a uniform initial displacement was set to get the total damping ratio. This study also investigates the relationship among the total damping ratio, m*ζ and critical velocity. © 2021

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IITH Creators:
IITH CreatorsORCiD
Item Type: Article
Additional Information: The authors would like to thank Department of Mechanical Engineering, HIT and KLEF for providing experimental and computational facilities in carrying out this research work.
Uncontrolled Keywords: Amplitude response; Critical velocity; Flow-induced vibration; Galloping; Tandem cylinders
Subjects: Physics > Mechanical and aerospace
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 18 Jul 2022 12:14
Last Modified: 18 Jul 2022 12:14
URI: http://raiith.iith.ac.in/id/eprint/9616
Publisher URL: http://doi.org/10.1016/j.marstruc.2021.103137
OA policy: https://v2.sherpa.ac.uk/id/publication/16592
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