As more floating farms are being developed, the wake interaction between multiple floating wind turbines (FWTs) is becoming increasingly relevant. FWTs have long natural periods in certain degrees of freedom, and the large‐scale movement of the wake, known as wake meandering, occurs at very low frequencies. In this study, we use FAST.Farm to simulate a two‐turbine case with three different FWT concepts: a semisubmersible (semi), a spar, and a tension leg platform (TLP), separated by eight rotor diameters in the wind direction. Since wake meandering varies depending on the environmental conditions, three different wind speeds (for all three concepts) as well as two different turbulence levels (for the semi) are considered. For the below‐rated wind speed, when wake meandering was most extreme, yaw motion standard deviations for the downstream semi were approximately 40% greater in high turbulence and over 100% greater in low turbulence when compared with the upstream semi. The low yaw natural frequency (0.01 Hz) of the semi was excited by meandering, while quasi‐static responses resulted in approximately 20% increases in yaw motion standard deviations for the spar and TLP. Differences in fatigue loading between the upstream and downstream turbines for the mooring line tension and tower base fore‐aft bending moment mostly depended on the velocity deficit and were not directly affected by meandering. However, wake meandering did affect fatigue loading related to the tower top yaw moment and the blade root out‐of‐plane moment.

中文翻译：

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对浮动风力涡轮机的尾迹曲折影响

随着越来越多的浮动农场的发展，多个浮动风力涡轮机（FWT）之间的尾流相互作用变得越来越重要。FWT在一定的自由度上具有较长的自然周期，并且尾波的大规模运动（称为尾波曲折）在非常低的频率下发生。在本研究中，我们使用FAST.Farm模拟具有三种不同FWT概念的两涡轮机情况：半潜式（semi），翼梁和张紧腿平台（TLP），它们在风向上由八个转子直径分隔开。由于尾流曲折会根据环境条件而变化，因此考虑了三种不同的风速（针对所有三个概念）以及两种不同的湍流水平（针对半湍流）。对于低于额定的风速，当蜿蜒曲折最严重时，与上游半部分相比，下游半部分的偏航运动标准偏差在高湍流中大约大40％，在低湍流中大于100％。半曲的低偏航固有频率（0.01 Hz）通过弯曲而被激发，而准静态响应导致翼梁和TLP偏航运动标准偏差增加了约20％。系泊缆线张力和塔基前后弯矩时，上游和下游涡轮机之间的疲劳载荷差异主要取决于速度赤字，而不受弯曲的直接影响。但是，尾流弯曲确实会影响与塔顶偏航力矩和叶片根部平面外力矩有关的疲劳载荷。