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Dynamic mooring simulation with Code(-)Aster with application to a floating wind turbine


Citation Antonutti, R., Peyrard, C., Incecik, A., Ingram, D.M., Johanning. L. Dynamic mooring simulation with Code(-)Aster with application to a floating wind turbine, Ocean Engineering, 151: 366-377, 2017. https://doi.org/10.1016/j.oceaneng.2017.11.018.
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Author(s) Antonutti, R., Peyrard, C., Incecik, A., Ingram, D.M., Johanning. L.
Project partner(s) Electricité de France, The University ofStrathclyde, University of Edinburgh, University of Exeter
Publisher Ocean Engineering, 151: 366-377
DOI https://doi.org/10.1016/j.oceaneng.2017.11.018
Abstract The design of reliable station-keeping systems for permanent floating structures such as offshore renewable energy devices is vital to their lifelong integrity. In highly dynamic and/or deep-water applications, including hydrodynamics and structural dynamics in the mooring analysis is paramount for the accurate prediction of the loading on the lines and hence their dimensioning. This article presents a new workflow based on EDF R&D’s open-source, finite-element analysis tool Code Aster, enabling the dynamic analysis of catenary mooring systems, with application to a floating wind turbine concept. The University of Maine DeepCwind-OC4 basin test campaign is used for validation, showing that Code Aster can satisfactorily predict the fairlead tensions in both regular and irregular waves. In the latter case, all of the three main spectral components of tension observed in the experiments are found numerically. Also, the dynamic line tension is systematically compared with that provided by the classic quasi-static approach, thereby confirming its limitations. Robust dynamic simulation of catenary moorings is shown to be possible using this generalist finite-element software, provided that the inputs be organised consistently with the physics of offshore hydromechanics

Highlights
  • Inclusion of dynamic effects is essential for reliable mooring system design for highly dynamic offshore structures.
  • Open-source finite-element software Code_Aster from EDF R&D is shown to handle mooring dynamics upon correct set-up.
  • Motions and fairlead tensions are validated using existing basin test data from the DeepCwind-OC4 floating wind campaign.
  • Regular and irregular wave cases are compared, showing good agreement between the dynamic numerical and physical model.
  • Mid-high frequency tension components from quasi-static approach are severely underestimated for the considered load cases.
>This work was partly funded via IDCORE, the Industrial Doctorate Centre for Offshore Renewable Energy, which trains research engineers whose work in conjunction with sponsoring companies aims to accelerate the deployment of offshore wind, wave and tidal-current technologies
Associated Project(s) ETI-MA2003: Industrial Doctorate Centre for Offshore Renewable Energy (IDCORE)
Associated Dataset(s) EDC0000134: Tidal Energy Site Environmental Conditions Measured During the ReDAPT Tidal Project 2011-2014
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