Abstract
In this study, advanced hydrodynamic models are proposed to predict dynamic response of a floating offshore wind turbine (FOWT) in combined wave and current conditions and validated by laboratory and full-scale semi-submersible platforms. Firstly, hydrodynamic coefficient models are introduced to evaluate the added mass and drag coefficients in a wide range of Reynolds numbers. An advanced hydrodynamic model is then proposed to calculate the drag force of cylinder in combined wave and current conditions. The proposed model is validated by the water tank tests in the current-only, wave-only and current-wave conditions and is used to investigate the effect of current on the dynamic response of FOWT. Finally, the full-scale semi-submersible platform used in the Fukushima demonstration project is investigated. It is found that the predicted dynamic responses of platform by the proposed hydrodynamic models are improved by the directional spreading function of the sea wave spectrum and show favorable agreement with the field measurement.
Highlights
The aim of this study is to propose advanced hydrodynamic models and predict dynamic response of a floating wind turbine in the combined wave-current conditions for laboratory and full-scale semi-submersible platforms
The conclusions are obtained as follows: The global hydrodynamic coefficient models considering the effects of Reynolds and KC
Reynolds and KC numbers were proposedcoefficient for the firstmodels time to considering evaluate the added massofand drag coefficients for werethe proposed for and the first time platforms
Summary
The added mass and drag coefficients significantly affect the motion of FOWT and associate with the Keulegan-Carpenter number, KC, Reynolds number, Re, and surface roughness [5]. Sarpkaya [6,7] conducted a series of experiments and investigated the hydrodynamic coefficients of the two-dimensional cylinders in the oscillatory and steady flows with a wide range of Reynolds numbers. It was found that added mass and drag coefficients of the cylinders approached a constant value as Reynolds number increased. Zhang and Ishihara [8] examined the effects of KC number, thickness and diameter of heave plate on the hydrodynamic coefficients by the numerically forced oscillation tests. Liu and Ishihara [10] proposed a hydrodynamic coefficient model to estimate the hydrodynamic coefficients for different components in a semi-submersible FOWT to take the influences of Reynolds and KC numbers into account
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