Enhancing the Hydrodynamic Modeling of Spar-Type Floating Offshore Wind Turbines
Incorporating Vortex-Induced Vibrations in OpenFAST
Taeksang Kim (University of Michigan)
Jeongbin Park (University of Michigan)
Seymour M.J. Spence (University of Michigan)
Yulin Pan (University of Michigan)
Ayumi Fujisaki-Manome (University of Michigan)
Jeremy David Bricker (TU Delft - Hydraulic Structures and Flood Risk, University of Michigan)
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Abstract
Floating Offshore Wind Turbines (FOWTs) operate under complex environmental conditions, where unsteady hydrodynamic forces such as vortex-induced vibrations (VIV) can significantly influence structural response. However, conventional modeling approaches often neglect VIV effects, leading to underestimation of platform motion and hydrodynamic loading. This study incorporates a VIV-induced lift force model into the Morison equation framework within OpenFAST to assess its impact on the dynamic behavior of a spar-type FOWT under steady current conditions. Two simulation cases are compared: one assuming a stationary platform and the other allowing for platform motion through relative velocity coupling. Results show that VIV introduces multi-frequency oscillations in both hydrodynamic force and platform sway response, with amplitudes increasing with current speed. These findings focus on the importance of including VIV effects in hydrodynamic models for accurate prediction of FOWT behavior.