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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  11 Aug 2020

11 Aug 2020

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This preprint is currently under review for the journal WES.

Characterization of the unsteady aerodynamic response of a floating offshore wind turbine

Simone Mancini1, Koen Boorsma2, Marco Caboni2, Marion Cormier3, Thorsten Lutz3, Paolo Schito1, and Alberto Zasso1 Simone Mancini et al.
  • 1Politecnico di Milano, Department of Mechanical Engineering, Milano, Italy
  • 2ECN part of TNO, Petten, Netherlands
  • 3University of Stuttgart, Institute of Aerodynamics and Gas Dynamics, Stuttgart, Germany

Abstract. The disruptive potential of floating wind turbines has attracted the interest of both industry and scientific community. Lacking a rigid foundation, such machines are subject to large displacements whose impact on the aerodynamic performance is not yet fully acknowledged. In this work, the unsteady aerodynamic response to an harmonic surge motion of a scaled version of the DTU10MW turbine is investigated in detail. The imposed displacements have been chosen representative of typical platform motions. The results of different numerical models are validated against high fidelity wind tunnel tests specifically focused on the aerodynamics. Also a linear analytical model, relying on the quasi-steady assumption, is presented as a theoretical reference. The unsteady responses are shown to be dominated by the first surge harmonic and a frequency domain characterization, mostly focused on the thrust oscillation, is conducted involving aerodynamic damping and mass parameters. A very good agreement among codes, experiments and quasi-steady theory has been found clarifying some literature doubts. A convenient way to describe the unsteady results in non-dimensional form is proposed, hopefully serving as reference for future work.

Simone Mancini et al.

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Simone Mancini et al.

Simone Mancini et al.


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Latest update: 21 Sep 2020
Publications Copernicus
Short summary
This work aims at characterizing the aerodynamic response of a scaled version of a 10 MW floating wind turbine subject to an imposed wave induced motion. The focus has been put on the simple, yet significant, motion along the wind's direction (surge). For the purpose, different state of art aerodynamic codes have been used validating the outcomes with detailed wind tunnel experiments. This paper sheds light on floating turbines' unsteady performances for a more conscious controller design.
This work aims at characterizing the aerodynamic response of a scaled version of a 10 MW...