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A numerical study on the dynamic response of a floating spar platform in extreme waves

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Abstract

The investigation of the interaction of floating structures with very high waves, also known as freak or rogue waves, is of crucial importance for the analysis of their ultimate design conditions. The representation of such waves is usually achieved through computationally intensive numerical simulations. In this paper, a deterministic approach is proposed, to represent extreme wave groups in the space–time domain. The free surface profile for a Gaussian sea is obtained by means of the Quasi-Determinism theory, and the corresponding dynamic response of a spar-type support for floating offshore wind turbines in parked rotor conditions is analyzed. The Quasi-Determinism theory and the nonlinear equation of motion of the structure are coupled through an in-house time-domain numerical code. Wave forces and structure motions in surge, heave and pitch are obtained. A parametric analysis is carried out to investigate the effects of the criteria used for the definition of the extreme wave, its position of occurrence and the initial conditions in terms of body motions. The results obtained give a clear insight into the physics of the wave–structure interaction phenomenon for extremely high waves in Gaussian seas and allow to identify a few load combinations, corresponding to the severest wave conditions for the floating structure.

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Author information

Authors and Affiliations

  1. Natural Ocean Engineering Laboratory, DICEAM, Mediterranea University of Reggio Calabria, Reggio Calabria, Italy

    Carlo Ruzzo & Felice Arena

Authors
  1. Carlo Ruzzo
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  2. Felice Arena
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Corresponding author

Correspondence to Carlo Ruzzo.

Appendix

Appendix

Figure 13, 14, 15, 16 reports the complete time histories of wave surface elevation and structure motions, corresponding to one of the 1222 sea states, simulated during the analysis. In particular, the sea state corresponds to the occurrence of a zero-down-crossing group in correspondence to the structure.

Fig. 13
figure 13

Example of a complete sea state, including the realization of a zero-down-crossing extreme wave in correspondence to the structure (time in [s])

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Fig. 14
figure 14

Surge motions corresponding to the sea state reported in Fig. 13 (time in [s])

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Fig. 15
figure 15

Heave motions corresponding to the sea state reported in Fig. 13 (time in [s])

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Fig. 16
figure 16

Pitch corresponding to the sea state reported in Fig. 13 (time in [s])

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Ruzzo, C., Arena, F. A numerical study on the dynamic response of a floating spar platform in extreme waves. J Mar Sci Technol 24, 1135–1152 (2019). https://doi.org/10.1007/s00773-018-0612-9

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  • DOI: https://doi.org/10.1007/s00773-018-0612-9

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