Re-Evaluation of VIV Riser Fatigue Damage

• Published in: 29th International Conference on Ocean, Offshore and Arctic Engineering: Volume 6
• Main Authors: Tognarelli, Michael, Beynet, Pierre, Modarres-Sadeghi, Yahya, Bourguet, Remi, Triantafyllou, Michael S
• Other Authors: Massachusetts Institute of Technology. Department of Mechanical Engineering
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: ASME International 2019
• Subjects: Arctic
• Online Access: http://hdl.handle.net/1721.1/120730

The paper describes a new characterization of the properties of the vortex-induced vibrations (VIV) of marine risers, which emerges from processing field and experimental data. We show that two currently employed assumptions: (a) that VIV is a statistically steady-state response containing one or several frequencies, and (b) that VIV consists of alternating dominant modes (mode-sharing), are inadequate. Instead, we find that the response either contains strong traveling wave components accompanied by high force harmonics; or consists of a chaotic wandering among several traveling and standing waves, associated with a wide-band spectrum; both types of response require careful consideration for correct fatigue evaluation. Topics: Fatigue damage, Pipeline risers, Vortex-induced vibration BP-MIT Major Projects Program