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

在某些情况下，来自风暴波的负载可能会确定海上风力涡轮机子结构的尺寸。因此，准确确定非线性波负载对于安全但经济的设计很重要。与广泛使用的线性方法相比，本文将由完全非线性势波求解器OceanWave3D实现的完全非线性波合并到航空-气-水-弹性耦合模拟中，以减少一组波敏感设计载荷工况。和受约束的波浪。使用气弹代码HAWC2在水深33 m的大型单桩上对DTU 10 MW参考风力涡轮机进行了耦合的气弹模拟。根据塔底和单桩泥线的极限截面力矩研究了波浪非线性的影响。更高的极限时刻 当使用非线性波时，预计在塔底最大为5％，在单桩泥线上最大为13％。可以通过以下事实来解释：接近破坏极限的极端非线性波会引起共振振铃型响应，从而支配最终载荷响应。但是，与标准线性波方法相比，约束波方法显示出边际差异。至少对于当前配置可以得出结论，行业标准方法（线性和约束波方法）低估了严重海况下海上风力涡轮机的最终负荷响应。从而决定了最终的负载响应。但是，与标准线性波方法相比，约束波方法显示出边际差异。至少对于当前配置可以得出结论，行业标准方法（线性和约束波方法）低估了严重海况下海上风力涡轮机的最终负荷响应。从而决定了最终的负载响应。但是，与标准线性波方法相比，约束波方法显示出边际差异。至少对于当前配置可以得出结论，行业标准方法（线性和约束波方法）低估了严重海况下海上风力涡轮机的最终负荷响应。