Abstract
Floating offshore wind turbines (FOWTs) have been installed in Europe and Japan with relatively modern technology. The installation of floating wind farms in deep water is recommended because the wind speed is stronger and more stable. The design of the FOWT must ensure it is able to withstand complex environmental conditions including wind, wave, current, and performance of the wind turbine. It needs simulation tools with fully integrated hydrodynamic-servo-elastic modeling capabilities for the floating offshore wind turbines. Most of the numerical simulation approaches consider only first-order hydrodynamic loads; however, the second-order hydrodynamic loads have an effect on a floating platform which is moored by a catenary mooring system. At the difference-frequencies of the incident wave components, the drift motion of a FOWT system is able to have large oscillation around its natural frequency. This paper presents the effects of second-order wave loads to the drift motion of a semi-submersible type. This work also aimed to validate the hydrodynamic model of Ulsan University (UOU) in-house codes through numerical simulations and model tests. The NREL FAST code was used for the fully coupled simulation, and in-house codes of UOU generates hydrodynamic coefficients as the input for the FAST code. The model test was performed in the water tank of UOU.
Highlights
Offshore wind power has grown rapidly in recent decades
This paper presents the effects of second-order wave loads on the drift motion of the OC4 semi-submersible floating offshore wind turbines (FOWTs) [4] and validates the hydrodynamic model of UOU in-house codes
In a floating offshore wind turbine model test, the dominant forces are in hydrodynamic loads, including viscous force, gravity, inertia, and aerodynamic wind force
Summary
Offshore wind power has grown rapidly in recent decades. The trend of offshore wind power is inevitable in the future. Floating offshore wind turbine platforms can be provided using three concepts, which are spar, semi-submersible, and tension leg platform (TLP). In order to develop FOWTs, designers need a fully coupled numerical simulation tool that can combine stochastic wave, wind, and wind turbine performance. Kim et al investigated the second-order wave effects of the global performance of a semi-submersible 5 MW wind turbine by coupling FAST with CHARM3D [21], and the results were compared with a model test to validate the simulation modeling. This paper presents the effects of second-order wave loads on the drift motion of the OC4 semi-submersible FOWT [4] and validates the hydrodynamic model of UOU in-house codes. The investigation was conducted by numerical simulation and model tests for the FOWT
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