Ocean Systems Engineering

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Numerical investigation on hydrodynamic response of a SPAR platform for offshore wind energy

  • Arya Thomas (Department of Civil Engineering, Indian Institute of Technology Bombay) ;
  • V.K. Srineash (Department of Civil Engineering, Indian Institute of Technology Bombay) ;
  • Manasa Ranjan Behera (Department of Civil Engineering, Indian Institute of Technology Bombay)
  • Received : 2024.07.02
  • Accepted : 2024.09.10
  • Published : 2024.09.25
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Abstract

Th COP28 has emphasized the governments to speed up the transition away from fossil fuels to renewables such as wind and solar power in their next round of climate commitments. The steady and less turbulent wind over the ocean draws increased attention of governments, industries and researchers on exploring advanced technologies to extract energy from offshore wind. The present study numerically investigates the hydrodynamic behavior of a SPAR-type Floating Offshore Wind Turbine (FOWT) under various wave conditions and mooring line configurations. One of the major focuses of this study is investigating a freak wave's impact on a FOWT and determining its extreme responses. The study investigates the structural response under various wave impact for different configurations of mooring lines. The present study examines the wave-structure interaction under regular and freak wave conditions using numerical modelling approach. During the study, it is ensured that the natural frequency and wave induced motions of SPAR are inline with the experimental studies; thereby increasing the confidence in using the numerical model and domain for this investigation. The study considers the behaviour of slack and taut mooring arrangements under these wave conditions. The study observed that a taut mooring configuration can be efficient in restraining the FOWT motions, especially under a freak wave scenario. The Froude-Krylov force shows a non-linearity due to the non-uniform profile of the platform under all wave conditions. Overall, the study contributes to determining the performance of the mooring configurations under different wave conditions.

Keywords

Acknowledgement

Authors would like to thank and acknowledge the funding received from NIOT, MoES, Government of India through Project No. NIOT/F&A/DOM-V5-01. Also, we are grateful to Prof. Sverre Haver (University of Stavanger) for sharing the Draupner wave time series.

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