Analysis of Correction Factor Differences in Floating Offshore Wind Turbine Systems: Comparison Between Platform-Only and Fully Coupled Models

Floating offshore wind turbine systems are increasingly being used in deep-sea environments, where accurate predictions of platform motion responses are essential for safe and efficient design. This study evaluated the applicability of correction factors derived from simplified platform-only models when applied to more complex fully coupled models that include tower and turbine components. Computational fluid dynamics analysis was performed using STAR-CCM+ to quantify the viscous effects, and potential flow simulations were conducted using OrcaFlex for the platform-only and fully coupled conditions. One hundred and twenty-eight simulations were carried out by varying the combinations of drag coefficients in three motion modes: surge, heave, and pitch. The results showed that correction factors based on the fully coupled model provided the highest accuracy across all modes. On the other hand, those derived from platform-only models also showed acceptable performance in surge and heave motions, with less than 10 % deviations. The pitch response showed greater sensitivity to the drag coefficients, revealing limitations in using simplified models for fully coupled conditions. This study provides a quantitative basis for evaluating the transferability of correction factors between different modeling approaches, contributing to the practical application and generalization of correction factor use in floating platform motion analysis.