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Article

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

1
Escola Politécnica, University of São Paulo, São Paulo 05508-030, Brazil
2
Technomar—Engenharia Oceânica, São Paulo 05419-905, Brazil
3
OSPL—Ocean Space Planning Laboratory, Department of Systems Innovation, The University of Tokyo, Tokyo 113-8656, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Raúl García
J. Mar. Sci. Eng. 2021, 9(2), 179; https://doi.org/10.3390/jmse9020179
Received: 4 January 2021 / Revised: 25 January 2021 / Accepted: 26 January 2021 / Published: 10 February 2021
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 Floating Offshore Wind Turbine (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 was performed for concomitant effects of not aligned wave and wind. The experimental measurements 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, a frequency domain numerical analysis was performed 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 in 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 optimization procedures for the design of the floater and mooring lines. View Full-Text
Keywords: FOWT dynamics; seakeeping model tests; dynamic coupling effects; pitch motion response FOWT dynamics; seakeeping model tests; dynamic coupling effects; pitch motion response
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MDPI and ACS Style

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. https://doi.org/10.3390/jmse9020179

AMA Style

Amaral GA, Mello PC, do Carmo LHS, Alberto IF, Malta EB, Simos AN, Franzini GR, Suzuki H, Gonçalves RT. 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. Journal of Marine Science and Engineering. 2021; 9(2):179. https://doi.org/10.3390/jmse9020179

Chicago/Turabian Style

Amaral, Giovanni A., Pedro C. Mello, Lucas H.S. do Carmo, Izabela F. Alberto, Edgard B. Malta, Alexandre N. Simos, Guilherme R. Franzini, Hideyuki Suzuki, and Rodolfo T. Gonçalves 2021. "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" Journal of Marine Science and Engineering 9, no. 2: 179. https://doi.org/10.3390/jmse9020179

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