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Comparison of Nonlinear Wave-Loading Models on Rigid Cylinders in Regular Waves

Author

Listed:
  • Agota Mockutė

    (Department of Civil and Environmental Engineering, University of Florence, Via di S. Marta 3, 50139 Firenze, Italy
    Energy and Environment Institute, University of Hull, Cottingham Rd, Hull HU6 7RX, UK)

  • Enzo Marino

    (Department of Civil and Environmental Engineering, University of Florence, Via di S. Marta 3, 50139 Firenze, Italy)

  • Claudio Lugni

    (NTNU-AMOS & Center for Autonomous Marine Operation Systems, 7491 Trondheim, Norway
    Institute of Marine Hydrodynamics, Harbin Engineering University, Harbin 150001, China
    CNR-INM—Marine Technology Research Institute—National Research Council, Via di Vallerano 139, 00128 Rome, Italy)

  • Claudio Borri

    (Department of Civil and Environmental Engineering, University of Florence, Via di S. Marta 3, 50139 Firenze, Italy)

Abstract

Monopiles able to support very large offshore wind turbines are slender structures susceptible to nonlinear resonant phenomena. With the aim to better understand and model the wave-loading on these structures in very steep waves where ringing occurs and the numerical wave-loading models tend to lose validity, this study investigates the distinct influences of nonlinearities in the wave kinematics and in the hydrodynamic loading models. Six wave kinematics from linear to fully nonlinear are modelled in combination with four hydrodynamic loading models from three theories, assessing the effects of both types of nonlinearities and the wave conditions where each type has stronger influence. The main findings include that the nonlinearities in the wave kinematics have stronger influence in the intermediate water depth, while the choice of the hydrodynamic loading model has larger influence in deep water. Moreover, finite-depth FNV theory captures the loading in the widest range of wave and cylinder conditions. The areas of worst prediction by the numerical models were found to be the largest steepness and wave numbers for second harmonic, as well as the vicinity of the wave-breaking limit, especially for the third harmonic. The main cause is the non-monotonic growth of the experimental loading with increasing steepness due to flow separation, which leads to increasing numerical overpredictions since the numerical wave-loading models increase monotonically.

Suggested Citation

  • Agota Mockutė & Enzo Marino & Claudio Lugni & Claudio Borri, 2019. "Comparison of Nonlinear Wave-Loading Models on Rigid Cylinders in Regular Waves," Energies, MDPI, vol. 12(21), pages 1-22, October.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:21:p:4022-:d:279299
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    Citations

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    Cited by:

    1. Ferri, Giulio & Marino, Enzo, 2023. "Site-specific optimizations of a 10 MW floating offshore wind turbine for the Mediterranean Sea," Renewable Energy, Elsevier, vol. 202(C), pages 921-941.
    2. Giulio Ferri & Enzo Marino & Claudio Borri, 2020. "Optimal Dimensions of a Semisubmersible Floating Platform for a 10 MW Wind Turbine," Energies, MDPI, vol. 13(12), pages 1-20, June.
    3. Niccolo Bruschi & Giulio Ferri & Enzo Marino & Claudio Borri, 2020. "Influence of Clumps-Weighted Moorings on a Spar Buoy Offshore Wind Turbine," Energies, MDPI, vol. 13(23), pages 1-14, December.
    4. Ferri, Giulio & Marino, Enzo & Bruschi, Niccolò & Borri, Claudio, 2022. "Platform and mooring system optimization of a 10 MW semisubmersible offshore wind turbine," Renewable Energy, Elsevier, vol. 182(C), pages 1152-1170.

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