A comparison of two fully coupled codes for integrated dynamic analysis of floating vertical axis wind turbines

Boy Koppenol, Zhengshun Cheng, Zhen Gao, Carlos Ferreira, T Moan

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This paper presents a comparison of two state-of-the-art codes that are capable of modelling floating vertical axis wind turbines (VAWTs) in fully coupled time-domain simulations, being the HAWC2 by DTU and the SIMO-RIFLEX-AC code by NTNU/MARINTEK. The comparative study focusses on the way aerodynamics, hydrodynamics and structural dynamics are treated for DeepWind’s 5MW Darrieus rotor mounted on a modified OC3 spar platform. The relevant modelling differences are described, followed by an introduction to the spar VAWT concept and selected load cases. Isolation of the aerodynamic model is achieved using an equivalent rigid land-based VAWT in steady wind-only environments. The added complexity in SIMO-RIFLEX-AC’s aerodynamic model has shown to increase aerodynamic torque at tip-speed ratios above 2.5. Differences in the hydrodynamic and structural models were brought forward through fully coupled analyses in turbulent wind and irregular wave climates. It is found that the simplified mooring system in HAWC2 introduces a 2P yaw response (1P in SIMO-RIFLEX-AC), stronger motion coupling in surge-heave and a largely reduced mooring line tension since the dynamics of mooring lines are not considered. Indications are given that a higher tower mode is excited by 4P aerodynamic loading; an effect that is significantly stronger in HAWC2.
Original languageEnglish
Title of host publication14th Deep Sea Offshore Wind R&D Conference, EERA DeepWind'2017
EditorsJohn Olav Giæver Tande, Trond Kvamsdal, Michael Muskulus
Publication statusPublished - 2017
Event14th Deep Sea Offshore Wind R&D Conference - Trondheim, Norway
Duration: 18 Jan 201720 Jan 2017
Conference number: 14

Publication series

NameEnergy Procedia
ISSN (Electronic)1876-6102


Conference14th Deep Sea Offshore Wind R&D Conference
Abbreviated titleEERA DeepWind'2017


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