海上风机基础高阶水动力荷载数值模拟研究

Numerical investigation of higher-order hydrodynamic loads on offshore wind turbine foundation

在实际海洋环境下,海上风机结构常常承受非线性波浪和系泊系统的联合作用,探究海上浮式风机基础高阶水动力荷载及其运动响应非常重要。该文基于非线性势流理论和摄动展开技术,建立了海上浮式风机基础与波浪和系泊系统耦合作用的二阶时域高阶边界元数值分析模型,研究了OC4-DeepCwind半潜浮式风机基础在波浪作用下的动力响应特性。并通过与已发表数据进行对比,验证了模型准确性。分析计算得到的波浪力和平台运动响应随时间变化的演变特性及其与线性结果的区别,发现某些波频作用下非线性效应影响显著。该研究成果可为海上风电系统及海洋结构物设计提供一定参考。

In the real marine environment,the floating offshore wind turbine is often subjected to the combined action of nonlinear wave and mooring system,so it is significant to explore the high-order hydrodynamic loads and the motion response of the offshore floating wind turbine foundation.Based on the nonlinear potential flow theory and perturbation expansion technique,the time-domain higher-order boundary element method(HOBEM)for an offshore floating wind turbine foundation coupled with wave and mooring system is established.Also,the dynamic response characteristics of oc4-DeepCwind semi-submersible under wave action are studied.The accuracy of the proposed model is verified by comparing with the published data.It is found that the nonlinear effect is significant under some special wave frequencie s.This study can provide a reference for the design of the offshore wind turbine system and offshore structures.