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Computational modelling and experimental tank testing of the multi float WaveSub under regular wave forcing

Author

Listed:
  • Faraggiana, E.
  • Whitlam, C.
  • Chapman, J.
  • Hillis, A.
  • Roesner, J.
  • Hann, M.
  • Greaves, D.
  • Yu, Y.-H.
  • Ruehl, K.
  • Masters, I.
  • Foster, G.
  • Stockman, G.

Abstract

A submerged wave device generates energy from the relative motion of floating bodies. In WaveSub, three floats are joined to a reactor; each connected to a spring and generator. Electricity generated damps the orbital movements of the floats. The forces are non-linear and each float interacts with the others. Tuning to the wave climate is achieved by changing the line lengths, so there is a need to understand the performance trade-offs for a large number of configurations. This requires an efficient, large displacement, multidirectional, multi-body numerical scheme. Results from a 1/25 scale wave basin experiment are described. Here, we show that a time domain linear potential flow formulation (Nemoh, WEC-Sim) can match the tank testing provided that suitably tuned drag coefficients are employed. Inviscid linear potential models can match some wave device experiments; however, additional viscous terms generally provide better accuracy. Scale experiments are also prone to mechanical friction, and we estimate friction terms to improve the correlation further. The resulting error in mean power between numerical and physical models is approximately 10%. Predicted device movement shows a good match. Overall, drag terms in time domain wave energy modelling will improve simulation accuracy in wave renewable energy device design.

Suggested Citation

  • Faraggiana, E. & Whitlam, C. & Chapman, J. & Hillis, A. & Roesner, J. & Hann, M. & Greaves, D. & Yu, Y.-H. & Ruehl, K. & Masters, I. & Foster, G. & Stockman, G., 2020. "Computational modelling and experimental tank testing of the multi float WaveSub under regular wave forcing," Renewable Energy, Elsevier, vol. 152(C), pages 892-909.
    • Handle: RePEc:eee:renene:v:152:y:2020:i:c:p:892-909
    DOI: 10.1016/j.renene.2019.12.146
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    Citations

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    Cited by:

    1. Hillis, A.J. & Whitlam, C. & Brask, A. & Chapman, J. & Plummer, A.R., 2020. "Active control for multi-degree-of-freedom wave energy converters with load limiting," Renewable Energy, Elsevier, vol. 159(C), pages 1177-1187.
    2. Faraggiana, E. & Chapman, J.C. & Williams, A.J. & Whitlam, C. & Masters, I., 2022. "Investigation of new layout design concepts of an array-on-device WaveSub device," Renewable Energy, Elsevier, vol. 190(C), pages 501-523.
    3. Zheng, Siming & Phillips, John Wilfrid & Hann, Martyn & Greaves, Deborah, 2023. "Mathematical modelling of a floating Clam-type wave energy converter," Renewable Energy, Elsevier, vol. 210(C), pages 280-294.
    4. Gradowski, M. & Gomes, R.P.F. & Alves, M., 2020. "Hydrodynamic optimisation of an axisymmetric floating Oscillating Water Column type wave energy converter with an enlarged inner tube," Renewable Energy, Elsevier, vol. 162(C), pages 1519-1532.
    5. Ermando Petracca & Emilio Faraggiana & Alberto Ghigo & Massimo Sirigu & Giovanni Bracco & Giuliana Mattiazzo, 2022. "Design and Techno-Economic Analysis of a Novel Hybrid Offshore Wind and Wave Energy System," Energies, MDPI, vol. 15(8), pages 1-28, April.

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