The Effect of Second-Order Hydrodynamics on Floating Offshore Wind Turbines: Preprint

Research output: Contribution to conferencePaper


Offshore winds are generally stronger and more consistent than winds on land, making the offshore environment attractive for wind energy development. A large part of the offshore wind resource is however located in deep water, where floating turbines are the only economical way of harvesting the energy. The design of offshore floating wind turbines relies on the use of modeling tools that cansimulate the entire coupled system behavior. At present, most of these tools include only first-order hydrodynamic theory. However, observations of supposed second-order hydrodynamic responses in wave-tank tests performed by the DeepCwind consortium suggest that second-order effects might be critical. In this paper, the methodology used by the oil and gas industry has been modified to apply tothe analysis of floating wind turbines, and is used to assess the effect of second-order hydrodynamics on floating offshore wind turbines. The method relies on combined use of the frequency-domain tool WAMIT and the time-domain tool FAST. The proposed assessment method has been applied to two different floating wind concepts, a spar and a tension-leg-platform (TLP), both supporting the NREL 5-MWbaseline wind turbine. Results showing the hydrodynamic forces and motion response for these systems are presented and analysed, and compared to aerodynamic effects.
Original languageAmerican English
Number of pages13
StatePublished - 2013
EventDeepWind?2013 - 10th Deep Sea Offshore Wind R&D Conference - Trondheim, Norway
Duration: 24 Jan 201325 Jan 2013


ConferenceDeepWind?2013 - 10th Deep Sea Offshore Wind R&D Conference
CityTrondheim, Norway

NREL Publication Number

  • NREL/CP-5000-58718


  • offshore floating wind turbine
  • second-order hydrodynamics
  • spar buoy
  • tension leg platform
  • wave loads


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