Simulation of Spar Type Floating Offshore Wind Turbine Subjected to Misaligned Wind-Wave Loading Using Conservation of Momentum Method

Floating wind turbines are subjected to stochastic wind and wave loadings. Wind and wave loadings are not essentially aligned. The misalignment between wind and wave loadings affects the dynamical response of the floating wind turbines which needs to be studied. For this purpose, the nonlinear equations of motion of the spar-type floating wind turbine is derived using the Newton’s second law and conservation of angular momentum theory. The aerodynamic, hydrodynamic, mooring and buoyancy forces are determined and coupled with the system. The dynamic responses of the system are calculated and compared for different wind-wave misalignment angles. The simulation results demonstrate the importance of consideration of wind-wave misalignment angle on the dynamic response for the floating offshore wind turbine.