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OC7 phase I: Toward practical sea-state-dependent modeling of hydrodynamic viscous drag and damping

Journal Article · · Ocean Engineering
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  1. National Renewable Energy Laboratory (NREL), Golden, CO (United States)
  2. SINTEF Ocean AS, Trondheim (Norway)
  3. Norwegian Univ. of Science and Technology, Trondheim (Norway)
  4. PRINCIPIA, La Ciotat (France)
  5. Électricité de France, Chatou (France)
  6. Univ. College Cork (Ireland)
  7. Bureau Veritas, Saint-Herblain (France)
  8. Zhejiang Univ., Hangzhou (China)
  9. Dalian Univ. of Technology (China)
  10. Shanghai Jiao Tong Univ. (China)
  11. Norwegian Univ. of Science and Technology, Trondheim (Norway); Ocean Univ. of China (China)
  12. Ocean Univ. of China (China)
  13. Univ. of Central Florida, Orlando, FL (United States)
  14. Univ. Politecnica de Catalunya (Spain)
  15. Polytechnic Univ. of Turin (Italy)
  16. Univ. of Salerno (Italy); Uppsala Univ. (Sweden)
  17. Gavin & Doherty Geosolutions Ltd., Dublin (Ireland)
+ Show Author Affiliations

Here, this article presents a collaborative research campaign under the OC7 project on refining the engineering modeling approach for hydrodynamic viscous drag and damping on floating wind platforms, focusing on the adjustment of hydrodynamic drag and damping coefficients for different sea states. The participant simulation results show significant improvements over the previous OC6 project in predicting the low-frequency resonance motion under nonoperational conditions. The improvements are mainly due to enhanced modeling, including the adoption of wave stretching, and directly tuning the coefficients to measured platform motion in waves instead of free decay. For accurate predictions of mean- and slow-drift motion, the better performing models use a decreasing column splash zone drag coefficient and increasing surge damping/drag with increasing wave height. The model tuning for heave and pitch resonance shows less consistency. Generally, both quadratic drag and additional heave or pitch damping are needed for accurate predictions. Alternatively, a quadratic drag formulation with velocity filtering for the rectangular pontoons leads to improved predictions without additional damping. This model is also potentially more predictive, requiring minimal adjustment to its parameters for different conditions.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Wind Energy Technologies Office; USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AC36-08GO28308; AR0001187
OSTI ID:
2574684
Report Number(s):
NREL/JA--5000-93371
Journal Information:
Ocean Engineering, Journal Name: Ocean Engineering Vol. 336; ISSN 0029-8018
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (15)

OC5 Project Phase II: Validation of Global Loads of the DeepCwind Floating Semisubmersible Wind Turbine journal October 2017
Reproduction of slow-drift motions of a floating wind turbine using second-order hydrodynamics and Operational Modal Analysis journal July 2019
Validation and application of nonlinear hydrodynamics from CFD in an engineering model of a semi-submersible floating wind turbine journal September 2021
Wave hydrodynamic forces over mooring lines on floating offshore wind turbines journal January 2020
OC6 Phase Ib: Validation of the CFD predictions of difference-frequency wave excitation on a FOWT semisubmersible journal December 2021
Hydrodynamic analysis and validation of the floating DeepCwind semi-submersible under 3-h irregular wave with the HOS and CFD coupling method journal November 2023
Numerical simulation of a semi-submersible FOWT platform under calibrated extreme and irregular waves journal November 2024
Experimental and numerical investigation of nonlinear diffraction wave loads on a semi-submersible wind turbine journal June 2021
OC6 phase I: Improvements to the OpenFAST predictions of nonlinear, low-frequency responses of a floating offshore wind turbine platform journal March 2022
A formula for ‘wave damping’ in the drift of a floating body journal September 1994
Causality-Free Modeling and Validation of a Semisubmersible Floating Offshore Wind Turbine Platform With Tuned Mass Dampers journal October 2024
Low Frequency Wave Loads and Damping of Four MODUs in Severe Seastates With Current journal July 2020
A Wave Drift Force Model for Semi-Submersible Types of Floating Wind Turbines in Large Waves and Current journal August 2024
Iterative Frequency-Domain Response of Floating Offshore Wind Turbines with Parametric Drag journal October 2018
Quantifying the impact of modeling fidelity on different substructure concepts for floating offshore wind turbines – Part 1: Validation of the hydrodynamic module QBlade-Ocean journal March 2024

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Related Subjects

17 WIND ENERGY
OC7
WINDMOOR
drag
hydrodynamics
low frequency
resonance
sea state
validation
viscous