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Title: OC5 Project Phase II: Validation of Global Loads of the DeepCwind Floating Semisubmersible Wind Turbine

Journal Article · · Energy Procedia (Online)
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  1. National Renewable Energy Lab. (NREL), Golden, CO (United States)
  2. Fraunhofer Inst. for Wind Energy and Energy System Technology, Bremerhaven (Germany)
  3. Univ. of Maine, Orono, ME (United States)
  4. Maritime Research Inst., Wageningen (Netherlands)
  5. 4Subsea, Nesbru (Norway)
  6. National Renewable Energy Centre (CENER), Navarra (Spain)
  7. Centre for Marine Technology and Ocean Engineering (CENTEC), Lisbon (Portugal)
  8. DNV GL, Bristol (United Kingdom)
  9. Technical Univ. of Denmark, Lyngby (Denmark)
  10. European Centre of the Netherlands, Petten (Netherlands)
  11. Inst. for Energy Technology (IFE), Kjeller (Norway)
  12. IFP Energies nouvelles, Rueil-Malmaison (France)
  13. PRINCIPIA, Nantes (France)
  14. Politecnico di Milano (Italy)
  15. Siemens PLM, Barcelona (Spain)
  16. Tecnalia, San Sebastian (Spain)
  17. Univ. de Cantabria, Cantabria (Spain). IH Cantabria
  18. Univ. of Ulsan, Ulsan (South Korea)
  19. Univ. of Tokyo (Japan)
  20. Univ. Politecnica de Catalunya (Spain)
  21. WavEC Offshore Renewables, Lisbon (Portugal)
+ Show Author Affiliations

This paper summarizes the findings from Phase II of the Offshore Code Comparison, Collaboration, Continued, with Correlation project. The project is run under the International Energy Agency Wind Research Task 30, and is focused on validating the tools used for modeling offshore wind systems through the comparison of simulated responses of select system designs to physical test data. Validation activities such as these lead to improvement of offshore wind modeling tools, which will enable the development of more innovative and cost-effective offshore wind designs. For Phase II of the project, numerical models of the DeepCwind floating semisubmersible wind system were validated using measurement data from a 1/50th-scale validation campaign performed at the Maritime Research Institute Netherlands offshore wave basin. Validation of the models was performed by comparing the calculated ultimate and fatigue loads for eight different wave-only and combined wind/wave test cases against the measured data, after calibration was performed using free-decay, wind-only, and wave-only tests. The results show a decent estimation of both the ultimate and fatigue loads for the simulated results, but with a fairly consistent underestimation in the tower and upwind mooring line loads that can be attributed to an underestimation of wave-excitation forces outside the linear wave-excitation region, and the presence of broadband frequency excitation in the experimental measurements from wind. Participant results showed varied agreement with the experimental measurements based on the modeling approach used. Modeling attributes that enabled better agreement included: the use of a dynamic mooring model; wave stretching, or some other hydrodynamic modeling approach that excites frequencies outside the linear wave region; nonlinear wave kinematics models; and unsteady aerodynamics models. Also, it was observed that a Morison-only hydrodynamic modeling approach could create excessive pitch excitation and resulting tower loads in some frequency bands.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1416253
Report Number(s):
NREL/JA-5000-68050
Journal Information:
Energy Procedia (Online), Vol. 137, Issue C; ISSN 1876-6102
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 145 works
Citation information provided by
Web of Science

References (5)

Offshore Code Comparison Collaboration Continuation Within IEA Wind Task 30: Phase II Results Regarding a Floating Semisubmersible Wind System
  • Robertson, Amy; Jonkman, Jason; Vorpahl, Fabian
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering, Volume 9B: Ocean Renewable Energy https://doi.org/10.1115/OMAE2014-24040
conference October 2014
Definition of a 5-MW Reference Wind Turbine for Offshore System Development report February 2009
Additional Wind/Wave Basin Testing of the DeepCwind Semi-Submersible With a Performance-Matched Wind Turbine
  • Goupee, Andrew J.; Fowler, Matthew J.; Kimball, Richard W.
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering, Volume 9B: Ocean Renewable Energy https://doi.org/10.1115/OMAE2014-24172
conference October 2014
Development of a Scaled-Down Floating Wind Turbine for Offshore Basin Testing
  • de Ridder, Erik-Jan; Otto, William; Zondervan, Gert-Jan
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering, Volume 9A: Ocean Renewable Energy https://doi.org/10.1115/OMAE2014-23441
conference October 2014
Wind/Wave Basin Verification of a Performance-Matched Scale-Model Wind Turbine on a Floating Offshore Wind Turbine Platform
  • Kimball, Richard; Goupee, Andrew J.; Fowler, Matthew J.
  • ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering, Volume 9B: Ocean Renewable Energy https://doi.org/10.1115/OMAE2014-24166
conference October 2014

Cited By (8)

Elastic response of a light-weight floating support structure of FOWT with guywire supported tower journal December 2018
A CFD study of coupled aerodynamic-hydrodynamic loads on a semisubmersible floating offshore wind turbine journal November 2017
Robust gain scheduling baseline controller for floating offshore wind turbines journal September 2019
A Fully Coupled Computational Fluid Dynamics Method for Analysis of Semi-Submersible Floating Offshore Wind Turbines Under Wind-Wave Excitation Conditions Based on OC5 Data journal November 2018
Modeling of a Semisubmersible Floating Offshore Wind Platform in Severe Waves journal June 2019
Analysis of long‐term loading characterization for stress‐cycle fatigue design journal July 2019
Iterative Frequency-Domain Response of Floating Offshore Wind Turbines with Parametric Drag journal October 2018
Impact of aerodynamic modeling on seakeeping performance of a floating horizontal axis wind turbine journal April 2019

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Related Subjects

17 WIND ENERGY
42 ENGINEERING
floating offshore wind turbine
DeepCwind semisubmersible
numerical modeling
verifcation
validation
IEA Wind