Author Tiago Duarte (EDP Inovação), Sébastien Gueydon (MARIN), Jason Jonkman (National Renewable Energy Laboratory), António Sarmento (IST, University of Lisbon)
Title Computation of Wave Loads under Multidirectional Sea States for Floating Offshore Wind Turbines
Conference/Journal OMAE ASME 33rd International Conference on Ocean, Offshore and Arctic Engineering, San Francisco, CA
Month June
Year 2014

Abstract
This paper focuses on the analysis of a floating wind turbine under multidirectional wave loading. Special attention is given to the different methods used to synthesize the multidirectional sea state. This analysis includes the doublesum and single-sum methods, as well as an equal-energy discretization of the directional spectrum. These three methods are compared in detail, including the ergodicity of the solution obtained. From the analysis, the equal-energy method proved to be the most computationally efficient while still retaining the ergodicity of the solution. This method was chosen to be implemented in the numerical code FAST. Preliminary results on the influence of these wave loads on a floating wind turbine showed significant additional roll and sway motion of the platform.

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