A Comparative Investigation of Prevalent Hydrodynamic Modelling Approaches for Floating OffshoreWind Turbine Foundations: A TetraSpar Case Study

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Abstract

Numerical models have been used extensively in the design process of the TetraSpar floating offshore wind turbine (FOWT) foundation to optimize and investigate the influence from a number of structural and environmental conditions. In traditional offshore design, either the Morison approach or a linear boundary element method (BEM) is applied to investigate the hydrodynamic loads on a structure. The present study investigated and compared these two methods and evaluated their applicability on the TetraSpar FOWT concept. Furthermore, a hybrid model containing load contributions from both approaches was evaluated. This study focuses on motion response. In the evaluation, hydrodynamic data from BEM codes are applied, while the commercial software package OrcaFlex is utilized for time series simulations of the coupled structure. The investigation highlights the difference between the modelling approaches and the importance of particularly drag and inertia contributions. By optimizing the input coefficients, reasonable agreement between the models can be achieved.
Original languageEnglish
Article number683
JournalJournal of Marine Science and Engineering
Volume9
Issue number7
Number of pages16
ISSN2077-1312
DOIs
Publication statusPublished - 22 Jun 2021

Bibliographical note

This article belongs to the Special Issue FOWT–Floating Offshore Wind Turbine: Experimental and Numerical Modelling of Motion Behaviour in Waves, Wind and Current.

Keywords

  • Floating offshore wind turbines
  • Hydrodynamics
  • OrcaFlex
  • Morison
  • Boundary element method
  • Numerical simulation
  • TetraSpar

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