NDLI: Forced Oscillation Experiments for VIV of Circular Cylinders and Behaviors of VIV and Lock-In Phenomenon

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Masuda, Koichi Ikoma, Tomoki Kondo, Norio Maeda, Hisaaki
Copyright Year	2006
Abstract	This paper describes a model test to examine characteristics of vortex-induced vibrations (VIV) of tubing in water, e.g. a marine riser, and gives consideration of VIV characteristics from experimental results. Rigid circular cylinders are used for the model experiment because the authors assume that the model is a part of a marine riser. The test models are suspended into still water through a flat spring, and hence VIV can be found with hydroelasticity in spite of a rigid circular cylinder. This is a forced oscillation test in still water. The circular cylinders for the model test have drafts of 30cm, 60cm and 80cm, and diameter of 5cm and 8cm. The models are oscillated with periods of 0.5s to 4.6s and with about 7cm amplitude of the oscillation. In uniform flow, there is just one velocity of which flow causes the VIV lock-in. However, it is confirmed that there are several cases to experimental models, cases in which the VIV lock-in occurs in oscillatory flow. In addition, it is found that power spectra of VIV can be approximately classified into four patterns according to the number of spectral peaks and its property. Power spectra of VIV behavior from the model tests are compared with two-dimensional CFD computations.
Sponsorship	Ocean, Offshore, and Arctic Engineering Division
Starting Page	505
Ending Page	512
Page Count	8
File Format	PDF
ISBN	0791847497
DOI	10.1115/OMAE2006-92073
e-ISBN	0791837777
Volume Number	Volume 4: Terry Jones Pipeline Technology; Ocean Space Utilization; CFD and VIV Symposium
Conference Proceedings	25th International Conference on Offshore Mechanics and Arctic Engineering
Language	English
Publisher Date	2006-06-04
Publisher Place	Hamburg, Germany
Access Restriction	Subscribed
Subject Keyword	Water Spectra (spectroscopy) Computational fluid dynamics Tubing Computation Locks (waterways) Marine drilling risers Oscillations Flow (dynamics) Springs Circular cylinders Vortex-induced vibration
Content Type	Text
Resource Type	Article

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Wavelet Analysis of VIV Characteristics of Circular Cylinders Under Forced Oscillation

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Forced Oscillation Experiments for VIV of Circular Cylinders and Behaviors of VIV and Lock-In Phenomenon

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