Abstract
The present work revolves around the numerical simulation of floating offshore wind turbines, a promising technology for energy harnessing in deep water conditions. A reference 10MW wind turbine is studied, mounted on a commercial enhanced spar buoy, referred to as the WIND-bos platform. The focus is put on the hydrodynamic modeling. In particular, the Morison equation is used, accounting for a fixed set of coefficients. Those coefficients are initially estimated based on the literature, and subsequently calibrated through the comparison with experimental results on a scaled geometry. This allows to assess the modeling capabilities of the Morison approach, together with its challenges and limitations. Larger discrepancies between the numerical model and the experiments were assumed to be related to the geometrical particularities of the floating platform. In particular, the studied structure accounts for both large and slender members, potentially limiting the applicability of the method. It is shown that the deviations could be attributed to the frequency-variation of parameters such as the added mass, the radiation damping and viscous damping. Therefore, it is concluded that the agreement between the numerical model and the experiments could be improved by re-calibrating the coefficients for each of the studied sea states.
Highlights
The need for the deployment of a sustainable grid for energy production has become evident for most of the concerned organizations
It is concluded that the agreement between the numerical model and the experiments could be improved by re-calibrating the coefficients for each of the studied sea states
Decay Test The natural frequencies were computed based on the free decay tests, performed in the numerical model by an impulse load induced motion
Summary
The need for the deployment of a sustainable grid for energy production has become evident for most of the concerned organizations. The European Union has committed to climate-neutrality by 2050 [1] and has identified offshore wind energy as a pillar technology. Of particular relevance to the present work is the ensemble of technologies relying on wind turbines mounted on floating substructures, which are often referred to as floating wind. Scaled experiments are often used to dimension the floating substructure, taking into account the presence of the wind turbine [3, 4]. The main objective of such tests is the hydrodynamic characterization of the system. This is usually achieved through the computation of the response amplitude operators (RAOs) of the assembly, a series of the so-called decay tests, or both [5, 6]. It is possible to model the aerodynamic coupling by scaling the wind
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