Effects of Second-Order Hydrodynamic Forces on Floating Offshore Wind Turbines

Jason Jonkman, Tiago Duarte, Antonio Sarmento

Research output: Contribution to conferencePaperpeer-review

27 Scopus Citations

Abstract

Relative to first-order, second-order wave-excitation loads are known to cause significant motions and additional loads in offshore oil and gas platforms. The design of floating offshore wind turbines was partially inherited from the offshore oil and gas industry. Floating offshore wind concepts have been studied with powerful aero-hydro-servo-elastic tools; however, most of the existing work on floating offshore wind turbines has neglected the contribution of second-order wave-excitation loads. As a result, this paper presents a computationally efficient methodology to consider these loads within FAST, a wind turbine computer-aided engineering tool developed by the National Renewable Energy Laboratory. The method implemented was verified against the commercial OrcaFlex tool, with good agreement, and low computational time. A reference floating offshore wind turbine was studied under several wind and wave load conditions, including the effects of second-order slow-drift and sum-frequency loads. Preliminary results revealed that these loads excite the turbine's natural frequencies, namely the surge and pitch natural frequencies.

Original languageAmerican English
Number of pages18
DOIs
StatePublished - 2014
Event32nd ASME Wind Energy Symposium - SciTech Forum and Exposition 2014 - National Harbor, MD, United States
Duration: 13 Jan 201417 Jan 2014

Conference

Conference32nd ASME Wind Energy Symposium - SciTech Forum and Exposition 2014
Country/TerritoryUnited States
CityNational Harbor, MD
Period13/01/1417/01/14

NREL Publication Number

  • NREL/CP-5000-60966

Keywords

  • computer aided engineering (CAE)
  • fast
  • NREL
  • offshore wind turbines

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