Despite several potential advantages, relatively few studies and design support tools have been developed for floating VAWTs. Due to the substantial aerodynamics differences, the analyses of VAWT on floating structures cannot be easily extended from what have been already done for HAWTs. Therefore, the main aim of the present work is to compare the dynamic response of the FOWT system adopting two different mooring dynamics approaches. Two version of the in-house aero-hydro-mooring coupled model of dynamics for VAWT (FloVAWT) have been used, using: a mooring quasi-static model, which solves the equations using an energetic approach, and a modified version of FloVAWT, which instead couples with the lumped mass mooring line model MoorDyn. The results, in terms of mooring line tension, fatigue and response in frequency have been obtained and analysed, based on a 5MW Darrieus type rotor supported by the OC4-DeepCwind semisubmersible.
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