The offshore industry is moving to ever-increasing water depths, producing presently oil in depths of up to 2,500m, requiring detailed fatigue calculations for the risers and tendons used in the floating structures, see [1, 2]. Currents in the ocean are invariably highly sheared, hence the modes that can potentially be excited are many, see . The calculation of how many and which modes are excited, can affect fatigue life very significantly, but there are no guidelines presently available for conducting this calculation.
Vortex-Induced Vibrations of Long Marine Risers in Sheared Flows: DNS Studies
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Lucor, D, Ma, X, Triantafyllou, MS, & Karniadakis, GE. "Vortex-Induced Vibrations of Long Marine Risers in Sheared Flows: DNS Studies." Proceedings of the ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. Volume 1: Fora, Parts A, B, C, and D. Honolulu, Hawaii, USA. July 6–10, 2003. pp. 2745-2750. ASME. https://doi.org/10.1115/FEDSM2003-45241
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