Unveiling the dynamics of a novel floating wind-wave system in typhoon conditions through AHSS-CFD analysis

With the expansion of wind energy development toward deeper offshore waters, semi-submersible floating offshore wind turbines (FOWTs) may experience pronounced low-frequency sway responses under extreme typhoon conditions, posing challenges to their safe operation. To address the limitations of existing optimization strategies in sway control and multifunctional integration, this study investigates a novel platform (NP) integrated with tangential-radial wave energy converters (TRWECs). An Aero-Hydro-Servo-Structural (AHSS)-CFD numerical framework is employed to compare the dynamic responses and local flow characteristics of the NP and the original platform (OP) under typhoon-wave-current conditions. The results show that the NP substantially reduces the sway response and mooring-tension fluctuations. The TRWECs reorganize the local flow around the platform and enhance local energy dissipation, thereby contributing to additional hydrodynamic damping. Further analysis of different Connector configurations indicates that the spring constraints and damping characteristics affect the mechanical-energy transfer and dissipation between the platform and TRWECs. Meanwhile, the TRWECs retain favorable wave-energy conversion performance under extreme typhoon conditions. These results provide useful insights into the motion-mitigation mechanism of hybrid FOWT-WEC systems under extreme environmental conditions.