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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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This paper introduces the numerical models of two 15MW Floating Offshore Wind Turbines (FOWTs) WindCrete and Activefloat. WindCrete is a spar floating platform designed by Universitat Politècnica de Catalunya, while the Activefloat is a semi-submersible platform designed by Esteyco. The floaters are designed within the Horizon 2020 project COREWIND. Afterwards, the responses of both models to wind and second order waves are analyzed with an emphasis on the effect of second order waves.
Preprints
https://doi.org/10.5194/wes-2021-11
https://doi.org/10.5194/wes-2021-11

  18 Feb 2021

18 Feb 2021

Review status: a revised version of this preprint was accepted for the journal WES and is expected to appear here in due course.

Response of the IEA Wind 15 MW – WindCrete and Activefloat floating wind turbines to wind and second-order waves

Mohammad Youssef Mahfouz1, Climent Molins2, Pau Trubat2, Sergio Hernández3, Fernando Vigara3, Antonio Pegalajar-Jurado4, Henrik Bredmose4, and Mohammad Salari1 Mohammad Youssef Mahfouz et al.
  • 1Stuttgart Wind Energy (SWE), University of Stuttgart, Allmandring 5B, 70569 Stuttgart, Germany
  • 2UPC-Barcelona-Tech, Campus Nord, Carrer de Jordi Girona, 1, 3, 08034, Barcelona, Catalunya
  • 3Esteyco, SA, Menéndez Pidal, 17, 28036 Madrid, Spain
  • 4Department of Wind Energy, Technical University of Denmark, Nils Koppels Allé 403, 2800 Kongens Lyngby, Denmark

Abstract. The EU Horizon 2020 project COREWIND has developed two floating platforms for the new International Energy Agency (IEA) Wind 15 MW reference model. One design – WindCrete – is a spar floater, and the other – Activefloat – is a semi-submersible floater. In this work the design of the floaters is introduced with their aero-hydro-servo-elastic numerical models, and the responses of both floaters in both static and dynamic simulations are verified against the operational and survival design limits. The static displacements and natural frequencies are simulated and discussed. Additionally, the effects of the mean wave drift forces, and difference second order wave forces on the systems' responses are presented. The increase in the turbine's power capacity to 15MW in IEA Wind model, leads to an increase in inertial forces and aerodynamic thrust force when compared to similar floating platforms coupled to the Danish Technical University (DTU) 10MW reference model. The goal of this work is to investigate the floaters responses at different load cases. The results in this paper suggest that at mild wave loads the motion responses of the 15MW Floating Offshore Wind Turbines (FOWT) are dominated by low frequency forces. Therefore, motions are dominated by the wind forces, and second order wave forces rather than the first order wave forces. After verifying and understanding the models' responses, the two 15MW FOWT reference numerical models are publicly available to be used in the research and development of floating wind energy.

Mohammad Youssef Mahfouz et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2021-11', Anonymous Referee #1, 15 Mar 2021
    • AC1: 'Reply on RC1', Mohammad Mahfouz, 23 Apr 2021
  • RC2: 'Comment on wes-2021-11', Joseph Saverin, 23 Mar 2021
    • AC2: 'Reply on RC2', Mohammad Mahfouz, 23 Apr 2021
  • RC3: 'Comment on wes-2021-11', Anonymous Referee #3, 31 Mar 2021
    • AC3: 'Reply on RC3', Mohammad Mahfouz, 23 Apr 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2021-11', Anonymous Referee #1, 15 Mar 2021
    • AC1: 'Reply on RC1', Mohammad Mahfouz, 23 Apr 2021
  • RC2: 'Comment on wes-2021-11', Joseph Saverin, 23 Mar 2021
    • AC2: 'Reply on RC2', Mohammad Mahfouz, 23 Apr 2021
  • RC3: 'Comment on wes-2021-11', Anonymous Referee #3, 31 Mar 2021
    • AC3: 'Reply on RC3', Mohammad Mahfouz, 23 Apr 2021

Mohammad Youssef Mahfouz et al.

Model code and software

UPC - WINDCRETE OpenFAST model 15MW FOWT - Grand Canary Island Climent Molins; Pau Trubat; M. Youssef Mahfouz https://doi.org/10.5281/zenodo.4322446

COREWIND - ACTIVEFLOAT OpenFAST model 15 MW FOWT Grand Canary Island site Ruben Duran; Sergio Hernandez; Fernando Vigara; M. Youssef Mahfouz https://doi.org/10.5281/zenodo.4322585

Mohammad Youssef Mahfouz et al.

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Short summary
This paper introduces the numerical models of two 15MW Floating Offshore Wind Turbines (FOWTs) WindCrete and Activefloat. WindCrete is a spar floating platform designed by Universitat Politècnica de Catalunya, while the Activefloat is a semi-submersible platform designed by Esteyco. The floaters are designed within the Horizon 2020 project COREWIND. Afterwards, the responses of both models to wind and second order waves are analyzed with an emphasis on the effect of second order waves.
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