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@article{nelson_effects_2019, title = {The effects of wind turbine wakes on the fatigue lives of the downwind turbines’ support structures}, abstract = {This study evaluated, by time-domain simulations, the fatigue lives of several jacket support structures for 4MW wind turbines distributed throughout an offshore wind farm off Taiwan’s west coast. An in-house RANS-based wind farm analysis tool, WiFa3D, has been developed to determine the effects of the wind turbine wake behaviour on the flow fields through wind farm clusters. To reduce computational cost, WiFa3D employs an actuator disk model to simulate the body forces imposed on the flow field by the target wind turbines. WiFa3D simulations were performed for a range of environmental conditions, which were then combined with preliminary site survey metocean data to produce a long-term statistical environment. The short-term wind loads on the wind turbine rotors were calculated by an unsteady blade element momentum (BEM) model of the target 4MW wind turbines. The fatigue assessment of the jacket support structure was then conducted by applying the Rainflow Counting scheme on the hot spot stresses variations, as read-out from Finite Element results, and by employing appropriate SN curves. The fatigue lives of the jacket support structures at various locations in the wind farm showed significant variations with the preliminary design condition that assumed a single wind turbine without wake disturbance from other units.}, language = {en}, author = {Nelson, Bryan and Xie, Meng-Jie and Hou, Jian-Lun and Lin, Tsung-Yueh and Section, D}, month = jul, year = {2019}, pages = {11}, }