Computation of Wave Loads under Multidirectional Sea States for Floating Offshore Wind Turbines

AuthorsTiago Duarte (EDP Inovação), Sébastien Gueydon (MARIN), Jason Jonkman (National Renewable Energy Laboratory), António Sarmento (IST, University of Lisbon)
Conference/JournalOMAE ASME 33rd International Conference on Ocean, Offshore and Arctic Engineering, San Francisco, CA
DateJun 1, 2014

This paper focuses on the analysis of a floating windturbine under multidirectional wave loading. Special attentionis given to the different methods used to synthesize themultidirectional sea state. This analysis includes the doublesumand single-sum methods, as well as an equal-energydiscretization of the directional spectrum. These three methodsare compared in detail, including the ergodicity of the solutionobtained. From the analysis, the equal-energy method proved tobe the most computationally efficient while still retaining theergodicity of the solution. This method was chosen to beimplemented in the numerical code FAST. Preliminary resultson the influence of these wave loads on a floating wind turbineshowed significant additional roll and sway motion of theplatform.

stability, seakeeping and ocean engineeringrenewableseventsrenewable energyrent