Ultimate load analysis of a 10 MW offshore monopile wind turbine incorporating fully nonlinear irregular wave kinematics

Loads from storm waves can in some cases be dimensioning for offshore wind turbine substructures. Accurate determination of nonlinear wave loads is therefore important a safe, yet economic design. In this paper, the fully waves, realized by potential solver OceanWave3D, are incorporated into coupled aero-servo-hydro-elastic simulations reduced set wave-sensitive design load cases, comparison with widely used linear and constrained waves. The aero-elastic performed DTU 10 MW reference on large monopile at 33 m water depth using code HAWC2. Effect nonlinearity investigated terms ultimate sectional moments tower bottom mudline. Higher moments, 5% 13% mudline as maximum, predicated when used. It could explained fact that extreme close to breaking limit, induce resonant ringing-type responses, hereby dominate responses. However, approach shows marginal difference compared standard approach. concluded least present configuration industry approaches (linear approach) underestimate responses turbines severe sea states.