Preprints
https://doi.org/10.5194/wes-2021-131
https://doi.org/10.5194/wes-2021-131
 
04 Jan 2022
04 Jan 2022
Status: a revised version of this preprint was accepted for the journal WES and is expected to appear here in due course.

High-fidelity aeroelastic analyses of wind turbines in complex terrain: FSI and aerodynamic modelling

Giorgia Guma1, Philipp Bucher2, Patrick Letzgus1, Thorsten Lutz1, and Roland Wüchner3 Giorgia Guma et al.
  • 1Institute of Aerodynamics and Gas Dynamics, University of Stuttgart, Pfaffenwaldring 21, 70569 Stuttgart, Germany
  • 2Chair of Structural Analysis, Technical University of Munich, Arcisstr. 21, 80333 Munich, Germany
  • 3Institute of Structural Analysis, Technische Universität Braunschweig, Beethovenstr. 51, 38106 Braunschweig, Germany

Abstract. This paper shows high-fidelity Fluid Structure Interaction (FSI) studies applied on the research wind turbine of the WINSENT project. In this project, two research wind turbines are going to be erected in the South of Germany in the WindForS complex terrain test field. The FSI is obtained by coupling the CFD URANS/DES code FLOWer and the multiphysics FEM solver Kratos, in which both beam and shell structural elements can be chosen to model the turbine. The two codes are coupled in both an explicit and an implicit way. The different modelling approaches strongly differ with respect to computational resources and therefore the advantages of their higher accuracy must be correlated with the respective additional computational costs. The presented FSI coupling method has been applied firstly to a single blade model of the turbine under standard uniform inflow conditions. It could be concluded that for such a small turbine, in uniform conditions a beam model is sufficient to correctly build the blade deformations. Afterwards, the aerodynamic complexity has been increased considering the full turbine with turbulent inflow conditions generated from real field data, in both a flat and complex terrains. It is shown that in these cases a higher structural fidelity is necessary. The effects of aeroelasticity are then shown on the phase-averaged blade loads, showing that using the same inflow turbulence, a flat terrain is mostly influenced by the shear, while the complex terrain is mostly affected by low velocity structures generated by the forest. Finally, the impact of aeroelasticity and turbulence on the Damage Equivalent Loading (DEL) is discussed, showing that flexibility is reducing the DEL in case of turbulent inflow, acting as a damper breaking larger cycles into smaller ones.

Giorgia Guma et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2021-131', Christian Grinderslev, 26 Jan 2022
    • AC1: 'Reply on RC1', Giorgia Guma, 19 May 2022
  • RC2: 'Comment on wes-2021-131', Vasilis A. Riziotis, 11 Mar 2022
    • AC2: 'Reply on RC2', Giorgia Guma, 19 May 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2021-131', Christian Grinderslev, 26 Jan 2022
    • AC1: 'Reply on RC1', Giorgia Guma, 19 May 2022
  • RC2: 'Comment on wes-2021-131', Vasilis A. Riziotis, 11 Mar 2022
    • AC2: 'Reply on RC2', Giorgia Guma, 19 May 2022

Giorgia Guma et al.

Giorgia Guma et al.

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Short summary
Wind turbines aeroelasticity is becoming more and more important because turbine sizes are increasing leading to more slender blades. On the other side, complex terrains are of interest, because far away from urban areas. These regions are characterized by low velocities and high turbulence and are mostly influenced by the presence of the forest and that is why it is necessary to develop high fidelity tools to correctly simulate the wind turbine's response.