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

Text
Marine_Structures.pdf - Published Version
Restricted to Registered users only
Download (4MB) | Request a copy

Abstract

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

[error in script]

IITH Creators:

IITH Creators	ORCiD

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