Experimental and numerical investigation on the dynamic response of a 15 MW semisubmersible floating offshore wind turbine including 1-mooring line failure scenario

作者：Ikjae Lee, Da Li, Shenglei Fu, Cong Yi, Moo‐Hyun Kim, Alex Ran, Tuanjie Liu · 发表于：Ocean Engineering · 年份：2025 · DOI：10.1016/j.oceaneng.2025.122980 · 被引用次数：6 · 研究领域：Wave and Wind Energy Systems、Fluid Dynamics Simulations and Interactions、Fluid Dynamics and Vibration Analysis

A 1:64-scaled physical model test was conducted in a 3D wave tank for dynamic analysis of a 15 MW semisubmersible floating offshore wind turbine (FOWT) under combined wind/wave/current environmental excitations in a parked condition for intact and 1-mooring-line-failed scenarios. The semisubmersible is characterized by non-uniform columns and multiple heave plates, and it hosts the IEA 15 MW reference wind turbine and connected to a 3 × 2 chain-catenary mooring system at water depth of 51.2 m. Aero-hydro-servo-mooring-elastic coupled-dynamics mid-fidelity digital twin model was built in parallel. The static-offset and free-decay test results were compared with experiments to check coupled-system stiffness, damping and natural periods. Under intact conditions in extreme sea, several sensitivity studies were conducted and analyzed: (a) full quadratic transfer function (QTF) versus Newman's approximation, (b) viscous drag on heave plates, (c) linear and nonlinear hydrostatics, (d) turbulent and steady extreme wind models. It was found that the QTF method better estimates low-frequency platform and tension responses. Comparisons between intact and 1-line-failed conditions were also conducted. The line failure resulted in significant increase of platform's offset and neighboring mooring tensions, but transient response due to sudden disconnection did not show noticeable overshoots. Overall comparisons between experiment and simulation showed consistently good agreements. • 1:64-sc...