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Uncertainty Assessment of CFD Investigation of the Nonlinear Difference-Frequency Wave Loads on a Semisubmersible FOWT Platform

Author

Listed:
  • Lu Wang

    (National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA)

  • Amy Robertson

    (National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA)

  • Jason Jonkman

    (National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA)

  • Yi-Hsiang Yu

    (National Renewable Energy Laboratory (NREL), Golden, CO 80401, USA)

Abstract

Current mid-fidelity modeling approaches for floating offshore wind turbines (FOWTs) have been found to underpredict the nonlinear, low-frequency wave excitation and the response of semisubmersible FOWTs. To examine the cause of this underprediction, the OC6 project is using computational fluid dynamics (CFD) tools to investigate the wave loads on the OC5-DeepCwind semisubmersible, with a focus on the nonlinear difference-frequency excitation. This paper focuses on assessing the uncertainty of the CFD predictions from simulations of the semisubmersible in a fixed condition under bichromatic wave loading and on establishing confidence in the results for use in improving mid-fidelity models. The uncertainty for the nonlinear wave excitation is found to be acceptable but larger than that for the wave-frequency excitation, with the spatial discretization error being the dominant contributor. Further, unwanted free waves at the difference frequency have been identified in the CFD solution. A wave-splitting and wave load-correction procedure are presented to remove the contamination from the free waves in the results. A preliminary comparison to second-order potential-flow theory shows that the CFD model predicted significantly higher difference-frequency wave excitations, especially in surge, suggesting that the CFD results can be used to better calibrate the mid-fidelity tools.

Suggested Citation

  • Lu Wang & Amy Robertson & Jason Jonkman & Yi-Hsiang Yu, 2020. "Uncertainty Assessment of CFD Investigation of the Nonlinear Difference-Frequency Wave Loads on a Semisubmersible FOWT Platform," Sustainability, MDPI, vol. 13(1), pages 1-25, December.
    • Handle: RePEc:gam:jsusta:v:13:y:2020:i:1:p:64-:d:467016
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    References listed on IDEAS

    as
    1. Simos, Alexandre N. & Ruggeri, Felipe & Watai, Rafael A. & Souto-Iglesias, Antonio & Lopez-Pavon, Carlos, 2018. "Slow-drift of a floating wind turbine: An assessment of frequency-domain methods based on model tests," Renewable Energy, Elsevier, vol. 116(PA), pages 133-154.
    2. Tran, Thanh Toan & Kim, Dong-Hyun, 2016. "Fully coupled aero-hydrodynamic analysis of a semi-submersible FOWT using a dynamic fluid body interaction approach," Renewable Energy, Elsevier, vol. 92(C), pages 244-261.
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