Preprints
https://doi.org/10.5194/wes-2021-101
https://doi.org/10.5194/wes-2021-101

  22 Sep 2021

22 Sep 2021

Review status: this preprint is currently under review for the journal WES.

Impact of the wind field at the complex terrain site Perdigão on the surface pressure fluctuations of a wind turbine

Florian Wenz1, Judith Langner2, Thorsten Lutz1, and Ewald Krämer1 Florian Wenz et al.
  • 1University of Stuttgart, Institute of Aerodynamics and Gas Dynamics (IAG), Pfaffenwaldring 21, 70569 Stuttgart, Germany
  • 2WRD Management Support GmbH, Customer Support, Teerhof 59, 28199 Bremen, Germany

Abstract. The influence of turbulent inflow, as it occurs in complex terrain, on the unsteady surface pressure distributions on a wind turbine is investigated numerically. A method is presented that enables an accurate reproduction of the inflow to the turbine in the complex terrain in Perdigao, Portugal. For this purpose, a precursor simulation with the steady-state atmospheric computational fluid dynamics (CFD) code E-Wind and a high-resolution Delayed Detached Eddy Simulation (DDES) with FLOWer is performed. The conservation of the flow field is validated by a comparison with measurements from the 2017 field campaign in Perdigao. Then, the resolved fluid-structure coupled generic wind turbine I82 is included in the FLOWer simulation to investigate the impact of the complex terrain inflow on the surface pressure fluctuations on tower and blades. A comparison with simulations of the same turbine in flat terrain with simpler inflows shows that the turbine in complex terrain has a significantly different vortex shedding at the tower, which dominates the periodic pressure fluctuations at the tower sides and back. However, the dominant source of periodic pressure fluctuations on the upper part of the tower, the blade-tower interaction, is hardly altered by the terrain flow. The pressure fluctuations on the blade have a rather broadband characteristic, caused by the interaction of the leading edge with the inflow turbulence. In general, it is shown that a sophisticated DDES of the complex terrain plays a decisive role in the unsteady aerodynamics of the turbine, due to its specific flow characteristic.

Florian Wenz et al.

Status: open (until 10 Nov 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Florian Wenz et al.

Florian Wenz et al.

Viewed

Total article views: 231 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
184 44 3 231 3 1
  • HTML: 184
  • PDF: 44
  • XML: 3
  • Total: 231
  • BibTeX: 3
  • EndNote: 1
Views and downloads (calculated since 22 Sep 2021)
Cumulative views and downloads (calculated since 22 Sep 2021)

Viewed (geographical distribution)

Total article views: 216 (including HTML, PDF, and XML) Thereof 216 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Latest update: 25 Oct 2021
Download
Short summary
To get a better understanding of the influence of the terrain flow on the unsteady pressure distributions on the wind turbine surface, a fully resolved turbine was simulated in the complex terrain of Perdigão, Portugal. It was found that the pressure fluctuations at the tower caused by vortex shedding are significantly hampered by the terrain flow, while the pressure fluctuations caused by the blade-tower interaction are hardly changed.