Wind power generation is gradually expanding from land to sea. In floating offshore wind turbine, the position of floater is maintained by the mooring line, and it is difficult to predict the behavior by the combined action of wind and wave forces. To create optimal design conditions of floater and mooring line, a combined analysis of aerodynamics and hydrodynamics should be performed. Therefore, in this study, we have analyzed the behavior of the floater under wind and wave loads considering the aerodynamic damping effects of rotating blade. We used FAST provided by NREL for numerical simulations. Experiments were carried out in the Ocean Engineering Wide Tank, University of Ulsan, using the reduced OC3 Spar type platform model.
Since the Paris Conference of the Parties in 2015, interest in renewable energy around the world is higher than ever. Among them, wind power generation has achieved remarkable growth so that power generation cost can compete with the coal-fired power plant. Wind turbines on the land has a disadvantage of making noise caused by the blades, and it is difficult to secure a tract of land. On the other hand, offshore wind turbine is relatively easy to secure a large area, and it is free from noise even in the enlargement of the turbine. Also, it can obtain more persistent and stronger wind than on land. Therefore, wind power generation is gradually expanding from land to sea. In floating offshore wind turbine, to create optimal design conditions of floater and mooring line, a combined analysis of aerodynamics and hydrodynamics should be performed. Therefore, in this study, we have analyzed the behavior of the floater under wind and wave loads considering the aerodynamic damping effects of rotating blade. There are several papers (Salzmann and Temple, 2005; Myers and Valamanesh, 2014) that have already been studied. In this paper, presents the estimated results from the numerical simulations and the model scale experiments of the OC3-Hywind 5-MW Floating Offshore Wind Turbine. With a 1/128 scale ratio, model tests were carried out in the Ocean Engineering Wide Tank of University of Ulsan. Numerical simulations done by NREL-FAST v8. FAST v8 was performed according to following FAST User's Guide (Buhl and Jonkman, 2005). The objective is to analyze motion of floater considering aerodynamic damping effect at the combined wind/wave conditions.
