Numerical modelling and dynamic response analysis of dockside installation of a semi-submersible floating wind turbine considering multi-stage typhoon

With the increasing capacity of floating wind turbines (FWTs), the integrated dockside installation method has emerged as a practical installation method. The environmental conditions at the dockside become severe during typhoons and cause significant challenges for FWT installations. To ensure the safety of dockside installation, this study proposes a numerical model dedicated to capturing the wind field characteristics of multi-stage typhoons and performs analyses to predict the behavior of FWT installation under typhoon conditions. The multi-stage typhoon model was established for typhoon Doksuri. With the UMaine 15 MW turbine chosen as the example FWT; time-domain simulations were conducted to evaluate the coupled dynamic response of the dockside installation. The wind field simulation of typhoon Doksuri demonstrates the feasibility of the proposed numerical model for multi-stage typhoons. The results indicate different typhoon stages cause different aerodynamic loads onto FWTs, with the front eye wall stage (FEWS) being the most critical stage. The motion response of FWT during the installation is highly sensitive to wave conditions. Key findings indicate that adjusting the blade pitch and azimuth angle effectively mitigate aerodynamic loads and stabilize the platform motion dynamics. These findings offer valuable guidance for the integrated dockside installation of large-scale FWTs in typhoon-prone areas.