Abstract
The development of Floating Offshore Wind Turbines (FOWT) has been progressing steadily. To utilize the moderate water depth of 50–100 m ocean space around Japan, a barge-type FOWT was installed in Kitakyushu as part of a demonstration project conducted by the New Energy and Industrial Technology Development Organization (NEDO) of Japan. The FOWT mounts a 3 MW two-bladed wind turbine with blade diameter of 100 m and hub height of 72 m. The barge-type floating support structure is equipped with a moonpool in the center and a skirt at its bottom and is moored with 9 lines of catenary chains. To investigate the dynamic behavior of the barge-type FOWT in extreme condition and the validity of the numerical simulation in modeling the effect of the complex flow around the floating structure to the FOWT’s motion response, the FOWT’s motion data during typhoon Tapah on 23 September 2019 were measured and compared with the simulation results. As the results, the simulation results showed a good agreement in general to the measurement data. However, some shifts in the peak frequency of the simulation’s motion spectrum and a disagreement in waves with shorter wave periods were also observed. The possible causes of these differences are discussed thoroughly in this paper.
Highlights
To realize a low-carbon society and promote the utilization of ocean space, the development of offshore wind turbine in the world has been progressing steadily
With aim to verify the feasibility of a low-cost floating offshore wind turbine (FOWT) suitable for moderate water depth of 50–100 m, a demonstration 3 MW barge-type FOWT was installed in Kitakyushu in 2018 by the New Energy and Industrial Technology Development Organization (NEDO) of Japan
As Boundary Element Method (BEM)-based numerical simulation can be calculated considerably quicker compared to a full Computational Fluid Dynamic (CFD) analysis, using BEM potential flow theory to evaluate the sheer number of cases in the design of a FOWT may be more favorable to CFD
Summary
To realize a low-carbon society and promote the utilization of ocean space, the development of offshore wind turbine in the world has been progressing steadily. In 2016, Vijay et al [8] investigated the motion responses of several moonpool configurations of barge-type FOWT using Boundary Element Method (BEM) potential flow theory to model the hydrodynamics of the floating structure and FAST codes to model the aerodynamics of the wind turbine. As BEM-based numerical simulation can be calculated considerably quicker compared to a full CFD analysis, using BEM potential flow theory to evaluate the sheer number of cases in the design of a FOWT may be more favorable to CFD Validation of such numerical simulation method is still needed, especially compared to the motion response of an actual FOWT. For this paper, the motion response of the actual NEDO 3 MW barge-type FOWT during typhoon Tapah on 23 September 2019 was investigated and compared with the time domain numerical simulation results based on the BEM potential flow theory coupled with the aerodynamics of the wind turbine. The validity of the numerical simulation and the possible causes of the differences between the measurement and the simulation results shall be discussed in this paper
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