Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Seakeeping Tests of a Fowt in Wind and Waves: An Analysis of Dynamic Coupling Effects and Their Impact on the Predictions of Pitch Motion Response

Version 1 : Received: 4 January 2021 / Approved: 5 January 2021 / Online: 5 January 2021 (10:22:20 CET)

A peer-reviewed article of this Preprint also exists.

Amaral, G.A.; Mello, P.C.; do Carmo, L.H.S.; Alberto, I.F.; Malta, E.B.; Simos, A.N.; Franzini, G.R.; Suzuki, H.; Gonçalves, R.T. Seakeeping Tests of a FOWT in Wind and Waves: An Analysis of Dynamic Coupling Effects and Their Impact on the Predictions of Pitch Motion Response. J. Mar. Sci. Eng. 2021, 9, 179. Amaral, G.A.; Mello, P.C.; do Carmo, L.H.S.; Alberto, I.F.; Malta, E.B.; Simos, A.N.; Franzini, G.R.; Suzuki, H.; Gonçalves, R.T. Seakeeping Tests of a FOWT in Wind and Waves: An Analysis of Dynamic Coupling Effects and Their Impact on the Predictions of Pitch Motion Response. J. Mar. Sci. Eng. 2021, 9, 179.

Journal reference: J. Mar. Sci. Eng. 2021, 9, 179
DOI: 10.3390/jmse9020179

Abstract

The present work highlights some of the dynamic couplings observed in a series of tests performed in a wave basin with a scaled-model of a FOWT with semi-submersible substructure. The model was moored by means of a conventional chain catenary system and an actively controlled fan was used for emulating the thrust loads during the tests. A set of wave tests comprising regular and irregular waves was done for different wave angles and wind velocities. The experimental records illustrate the main coupling effects involved and how they affect the FOWT motions in waves, especially when the floater presents a non-negligible tilt angle.. In addition, an analysis of the frequency-domain dynamic model was made in order to evaluate its ability to capture these effects properly. The influence of different modes of fan response, floater trim angles (changeable with ballast compensation) and variations of the mooring stiffness with the offsets were investigated in the analysis. Results attest that significant changes in the FOWT responses may indeed arise from coupling effects, thus indicating that caution must be taken when simplifying the hydrodynamic frequency-domain models often used as a basis for the simulation of FOWTs in waves and in in optimization procedures for the design of the floater and mooring lines.

Keywords

FOWT dynamics; seakeeping model tests; dynamic coupling effects; pitch motion response.

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