The wake dynamics behind a compliant floating offshore wind turbine (FOWT) with two alternative supporting platforms of spar buoy and barge platform are studied numerically. The computational model is based on the large eddy simulation and the use of the actuator disk model of the FOWT rotor in which the circular actuator disk is discretized with an unstructured two‐dimensional triangular mesh in a structured three‐dimensional Cartesian grid of the fluid domain. The wake dynamics and platform motions are calculated for laminar and turbulent inflow conditions. The flow solver is verified through a series of experimental wake measurements done behind a porous disk model and is also cross‐validated against previously published results. The dynamics of the floating spar and barge structures are calculated from wave–structure interaction for three distinctive sea states. The time history of power extraction and wind force for the floating offshore wind turbine are recorded and compared against a fixed horizontal axis wind turbine. The motion of the barge platform is found to induce low‐frequency modulation of the wake, whereas the spar buoy primarily displays similar wake dynamics to the fixed turbine. It is discussed how a single turbine utilizing the spar concept can be more energy efficient under the wave‐induced motion. Moreover, for both laminar and turbulent inflow conditions, due to the large axial oscillation experienced by the barge concept, the turbine wake recovers more rapidly. This suggests that for a tighter spacing of the turbines in a farm, the barge platform concept can be leveraged to obtain higher energy‐capturing efficiency over a fixed area.

中文翻译：

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不同海况下驳船和翼梁式浮式海上风力发电机的空气动力学特性

数值研究了柔性浮式海上风力涡轮机（FOWT）的尾流动力学，该风力涡轮机具有两个浮标浮标和驳船平台替代支撑平台。该计算模型基于大型涡流仿真，并且使用了FOWT转子的致动器盘模型，其中圆形致动器盘通过非结构化二维三角网格离散化为流体域的结构化三维笛卡尔网格。 。针对层流和湍流入流条件计算了尾流动力学和平台运动。流量求解器通过在多孔圆盘模型后面进行的一系列实验尾流测量进行了验证，并且还针对先前发布的结果进行了交叉验证。浮动的翼梁和驳船结构的动力学是根据三种独特海状态的波结构相互作用来计算的。记录浮动海上风力涡轮机的功率提取和风力的时间历史，并与固定水平轴风力涡轮机进行比较。人们发现，驳船平台的运动会引起尾流的低频调制，而翼梁浮标主要表现出与固定涡轮相似的尾流动力学。讨论了利用翼梁概念的单个涡轮机在波浪引起的运动下如何更节能。而且，对于层流和湍流入流条件，由于驳船概念经历了较大的轴向振荡，因此涡轮机尾流恢复得更快。这表明在农场中更紧密的涡轮机间距时，