Vortex Induced Vibrations of Dynamic Power Cable for Floating Wind Turbines

Peter Elrick, Vengatesan Venugopal

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract / Description of output

Dynamic power cables are important structural components of floating renewable energy converters, such as floating wind turbines and other marine energy converters. Similar to marine risers, waves and currents are expected to produce Vortex Induced Vibrations (VIV) of these dynamic power cables. VIV of power cables can lead to a significantly shorter fatigue life if they are of large amplitude and frequency. In the past, numerous studies have been conducted investigating the vortex-induced vibrations of deep-sea risers and umbilicals but as of yet, only a very few studies have focused on dynamic power cables. This research work investigates the VIV of a dynamic power cable for a semi-submersible floating wind turbine based on the NREL offshore 5-MW baseline wind turbine. This study is conducted using the industry standard software tools, OrcaFlex and Shear7. The dynamic power cable has been modelled into a lazy wave configuration and the Milan Wake Oscillator and Iwan and Blevins oscillator models (both from OrcaFlex), and Shear7 are applied to predict the VIV behaviour under differing current conditions. Both uniform and shear currents are considered. In the numerical model simulations, the power cable is subjected to three different current propagation directions (i.e. 0o, 90o and 180o) and current speeds from 0-2.0 m/s. The results indicate that the behaviour of the cable vibrations is strongly dependent on the (i) submerged position of the cable along its length, (ii) structural and mechanical properties of the cable, (iii) current propagation direction and its magnitude, (iv) Strouhal number, and (v) choice of numerical model.

Original languageEnglish
Title of host publicationASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering
Subtitle of host publicationVolume 7: CFD & FSI
PublisherAmerican Society of Mechanical Engineers(ASME)
Number of pages11
ISBN (Electronic)9780791886892
DOIs
Publication statusPublished - 22 Sept 2023
EventASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2023 - Melbourne, Australia
Duration: 11 Jun 202316 Jun 2023

Publication series

NameProceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
Volume7

Conference

ConferenceASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2023
Country/TerritoryAustralia
CityMelbourne
Period11/06/2316/06/23

Keywords / Materials (for Non-textual outputs)

  • Dynamic power cable
  • RMS transverse vibration
  • Shear 7
  • Uniform and shear currents
  • Vortex induced vibrations

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