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