Numerical Prototype of the EDF Blyth Floating Wind Farm

该项目旨在开发一个内部数字原型，其中包括与波浪和海流载荷相结合的水气动弹性载荷分析，并考虑到二阶非线性效应。该模型将使用动态分析来评估使用半潜式基础和15 MW涡轮机的浮动海上风力项目的稳定性和疲劳。将对后测数据库ANEMOC3提供的真实的现场特定海况进行整体结构分析。将包括二阶波浪效应，因为它们可能至关重要，正如文献中使用二次传递函数所证明的那样。该工具的开发（以下称为“数值原型”）将使用完整的方向谱并计算载荷和自由度响应。在其25年的使用寿命中，每3小时海况的涡轮机响应。这种计算成本高的方法，总结了73000模拟的海况，旨在研究的不准确性，是固有的方法箱，是最常用的工业。正如文献中已经讨论过的，箱的方法具有关于箱的表示点、从总体计算中排除的海况和箱大小的疲劳计算不确定性。此外，数值方法避免了对谱方向性的进一步假设，其中仅考虑一个或两个主要方向，以及对风切变和湍流计算的进一步假设，其中由于缺乏表面粗糙度长度和表面摩擦速度的信息而做出假设。

This project aims to develop an in-house numerical prototype that will include hydro-aero-elastic loads analysis coupled with both wave and current loads, taking into account second-order nonlinear effects. This model will use dynamic analysis for estimating the stability and fatigue of a floating offshore wind project utilising a semi-submersible foundation and a 15 MW turbine. The overall structure analysis will be carried out for real site-specific sea states provided by the hind cast database ANEMOC3. Second order wave effects will be included as they can be crucial, as already proved in literature using Quadratic Transfer Functions.The development of this tool, from hereafter named 'Numerical Prototype', will use complete directional spectra and calculate loads and DoF responses of the turbine for every 3-hour sea state over its 25-year lifetime. This computationally costly method, summing up to 73000 simulations of sea states, aims to study the inaccuracies that are inherent to the method of bins that is most used in industry. As already discussed in literature, the method of bins has fatigue calculation uncertainties concerning the point of representation of bins, the excluded sea states from the overall calculation and the bin size. In addition, the Numerical Method avoids further assumptions on spectra directionality, where only one or two main directions are considered, and on wind shear and turbulence calculations, where assumptions are made due to lack of information of surface roughness length and surface friction velocity.