OC6 Phase I : Investigating the underprediction of low-frequency hydrodynamic loads and responses of a floating wind turbine

A. N. Robertson (1) , S. Gueydon (2) , E. Bachynski (3) , L. Wang (1) , J. Jonkman (1) , D. Alarcón (4) , E. Amet (5) , A. Beardsell (6) , P. Bonnet (7) , B. Boudet (5) , C. Brun (5) , Z. Chen (8) , M. Feron (9) , D. Forbush (10) , C. Galinos (11) , J. Galvan (12) , P. Gilbert (13) , J. Gomez (14) , V. Harnois (14) , F. Haudin (15) , Z. Hu (16) , J. Le Dreff (17) , M. Leimeister (18) , F. Lemmer (19) , H. Li (3) , G. Mac Kinnon (20) , Iñigo Mendikoa (12) , A. Moghtadaei (21) , S. Netzband (22) , S. Oh (23) , A. Pegalajar-Jurado (11) , M. Q. Nguyen (15) , K. Ruehl (10) , P. Schunemann (24) , W. Shi (25) , H. Shin (26) , Y. Si (8) , F. Surmont (5) , P. Trubat (4) , J. Qwist (27) , S. Wohlfahrt-Laymann (19)

1 NREL - National Renewable Energy Laboratory
2 MARIN - Maritime Research Institute Netherlands
3 NTNU - Norwegian University of Science and Technology [Trondheim]
4 UPC - Universitat Politècnica de Catalunya [Barcelona]
5 VERITAS - BUREAU VERITAS Certification FRANCE
6 DNV GL
7 Siemens Digital Industries Software
8 Ocean College
9 DORIS Engineering
10 SNL - Sandia National Laboratories [Albuquerque]
11 DTU Wind Energy
12 Tecnalia [Derio]
13 IFPEN - IFP Energies nouvelles
14 Principia [La Ciotat]
15 Vulcain Ingénierie
16 School of Engineering [Newcastle]
17 EDF R&D - EDF R&D
18 Fraunhofer IWES - Fraunhofer Institute for Wind Energy Systems
19 Universität Stuttgart [Stuttgart]
20 Orcina
21 QUB - Queen's University [Belfast]
22 TUHH - Hamburg University of Technology
23 ClassNK
24 Universität Rostock
25 Dalian University of Technology
26 University of Ulsan
27 Subsea

Phase I of the OC6 project is focused on examining why offshore wind design tools underpredict the response (loads/motion) of the OC5-DeepCwind semisubmersible at its surge and pitch natural frequencies. Previous investigations showed that the underprediction was primarily related to nonlinear hydrodynamic loading, so two new validation campaigns were performed to separately examine the different hydrodynamic load components. In this paper, we validate a variety of tools against this new test data, focusing on the ability to accurately model the low-frequency loads on a semisubmersible floater when held fixed under wave excitation and when forced to oscillate in the surge direction. However, it is observed that models providing better load predictions in these two scenarios do not necessarily produce a more accurate motion response in a moored configuration.

Keywords: low-frequency hydrodynamic; floating wind turbine

Domains: Environmental Engineering

A. N. Robertson, S. Gueydon, E. Bachynski, L. Wang, J. Jonkman, et al.. OC6 Phase I : Investigating the underprediction of low-frequency hydrodynamic loads and responses of a floating wind turbine. Journal of Physics: Conference Series, 2020, 1618, pp.032033. ⟨10.1088/1742-6596/1618/3/032033⟩. ⟨hal-03007787⟩