Experimental and Numerical analysis of a Floating Offshore Wind Turbine in waves and wind

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Floating Offshore Wind technologies have gathered a significant amount of interest in recent years following the relative success of fixed offshore wind across Europe and the decrease in its LCOE. Several platform concepts inherited from the O&G industry have been proposed as floating substructure for offshore wind turbines. These include semi-submersible, spar and tension-legged (TLP) type platform, the former having inspired the most advanced concepts to date.Compared to semi-submersible which resist dynamic loading mostly through their buoyancy, TLPs are less compliant systems resisting dynamic forces through their pre-tensioned tendons. Whilst this reduces the weight of the platform hull, one of the most critical design component becomes the understanding of extreme loading conditions in the mooring system. Therefore, developing numerical models that accurately identify extreme design conditions is critical in the development and validation of TLP concepts. Recent research by Bachysnki [1], [2] has shown that including sum-frequency second order forces and third order ringing loads are important to capture extreme positive and negative (slacking) events critical in the design of the platform moorings.In light of this research, EDF has been working on improving its in-house hydro-aerodynamic simulation software, CHALYPSO, in order to evaluate technologies for possible development in the Mediterranean, North-East Atlantic and possibly North-Sea (UK).