Abstract
Both numerical calculation and model test are important techniques to study and forecast the dynamic responses of the floating offshore wind turbine (FOWT). However, both the methods have their own limitations at present. In this study, the dynamic responses of a 5 MW OC3 spar-type floating wind turbine designed for a water depth of 200 m are numerically investigated and validated by a 1:50 scaled model test. Moreover, the discrepancies between the numerical calculations and model tests are obtained and discussed. According to the discussions, it is found that the surge and pitch are coupled with the mooring tensions, but the heave is independent of them. Surge and pitch are mainly induced by wave under wind wave conditions. Wind and current will induce the low-frequency average responses, while wave will induce the fluctuation ranges of the responses. In addition, wave will induce the wavefrequency responses but wind and current will restrain the ranges of the responses.
Highlights
With the traditional energy is increasingly exhausted over the past decade, clean and environmental friendly renewable energy, especially offshore wind energy, has attracted more attention than ever before
Dynamic response of a 5 MW OC3 spar-type floating wind turbine in different conditions is analyzed in both time domain and frequency domain by FAST code and a 1:50 scaled model test
On the basis of the comparisons of numerical calculation and model test, it can be found that the results of FAST are credible in general
Summary
With the traditional energy is increasingly exhausted over the past decade, clean and environmental friendly renewable energy, especially offshore wind energy, has attracted more attention than ever before. In phase IV of the Offshore Code Comparison Collaboration (OC3), a spar floating platform which is called OC3-Hywind was designed for the 5MW baseline wind turbine (Jonkman, 2010). 1: 50 scaled model tests of spar, semi and TLP floating platforms to verify the dynamic responses of these three floating wind turbine concepts (Martin et al, 2012; Koo et al, 2012; Goupee et al, 2012; Kimball et al, 2012). In 2016, a 1:50 scaled model test of a 5 MW OC3 spar-type floating wind turbine which is designed for a water depth of 200 m was carried out at Shanghai Jiao Tong University. This work studies the dynamic responses of the 5 MW OC3 spar-type floating wind turbine in different sea conditions through numerical calculations using fully coupled time domain FAST code (Jonkman and Jr, 2005). It is expected that this study can bring valuable information for engineering application in the future
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