Objective The complex multi-physics coupling characteristics of floating offshore wind turbines (FOWTs) make research into associated numerical calculation methods and tools a key technical aspect in the field of floating wind power. The paper aims to establish a multi-level dynamical model that accommodates the varying requirements for simulation accuracy and efficiency at different design stages. Based on this model, a corresponding multi-physics coupling numerical simulation tool for FOWTs has been developed.

Method Newton-Euler equations and Kane's equations were employed to construct the multi-level dynamical model of a FOWT. The Blade Element Momentum (BEM) method with corrections was used to calculate rotor aerodynamic loads, while potential flow theory combined with the Morrison formula was applied to calculate the hydrodynamic loads on the floating platform. Various numerical mooring models and advanced controller models were developed, including torque control, pitch angle control, yaw control, independent pitch control, gyrostabilizer control and active mooring control.

Result The results demonstrate that the multi-physics coupling numerical simulation tool for FOWTs, developed based on the aforementioned theoretical approaches, agrees with experimental results and effectively predicts the dynamic response of FOWTs under both normal and fault conditions. The developed controller significantly enhances the turbine power stability and mitigates platform motion. Furthermore, integrating artificial intelligence algorithms improves the accuracy of numerical predictions. The program's external functions enable flexible expansion of its numerical calculation and analytical capabilities.

Conclusion This study provides an effective numerical tool for predicting and analyzing the dynamic response of FOWTs, contributing to the development of softwares in the offshore wind power industry.