Advertisement

Flow Around Thick Airfoils at Very High Reynolds Number. Stall and Dynamic Stall Applications

  • F. Barnaud Email author
  • P. Bénard
  • G. Lartigue
  • V. Moureau
  • P. Deglaire
Conference paper
Part of the ERCOFTAC Series book series (ERCO, volume 25)

Abstract

With the increase of the power and rotor diameter of modern wind turbines, blade loads must be predicted with high confidence in order to optimize accurately the complex blade internal structure. Unsteady aerodynamic loadings such as dynamic stall are the main challenges for state-of-the-art numerical tools (Leishman, Challenges in modeling the unsteady aerodynamics of wind turbines, 2002, [5]). Dynamic stall can appear on horizontal-axis wind turbines (HAWT) in several operating conditions: misalignment with the wind direction, free-stream turbulence, fast pitch maneuvers... Wind tunnel experiments and RANS or URANS simulations are the state-of-the-art tools to obtain estimations of aerodynamic forces, specifically in stall and dynamic stall cases. The present work aims at getting a better insight into the dynamics of the flow around thick wind turbines airfoils thanks to Large-Eddy Simulation (LES), which resolves a broader range of turbulent scales. These thick airfoils operate at very high Reynolds number because of the dimensions of the rotor. In order to perform LES with realistic CPU time, a Wall-Modeled LES (WMLES) strategy is considered. Several simulations are carried out at Reynolds number of \(1.6\cdot 10^6\) on the FFA-W3-241 profile, a \(24.1\%\) relative thickness profile. Attached flow is first investigated, then detached flow in steady and oscillating conditions are studied. The impact of spanwise length is considered, in particular for stalled cases.

Notes

Acknowledgements

This work was granted access to the HPC resources of IDRIS, CCRT and CRIANN, under the allocations GENCI/x20172b6186 and CRIANN/2008013, respectively. This study is part of the MOQUA project managed by IRT Jules Verne (French Institute in Research and Technology in Advanced Manufacturing Technologies for Composite, Metallic and Hybrid Structures). The authors wish to associate the industrial and academic partners of this project: IRT Jules Verne, Adwen, Loiretech, UBS, Nenuphar, ECN and CNRS.

References

  1. 1.
    Cook, A.W., Cabot, W.H.: A high-wavenumber viscosity for high-resolution numerical methods. J. Comput. Phys. 195(2), 594–601 (2004)CrossRefGoogle Scholar
  2. 2.
    Fuglsang, P.: Wind tunnel tests of the FFA-W3-241, FFA-W3-301 and NACA 63–430 airfoils, Risø-R-1041(EN). Risø National Laboratory, Roskilde (1998)Google Scholar
  3. 3.
    Fukumoto, H., Aono, H., Nonomura, T., Oyama, A., Fujii, K.: Significance of computational spanwise domain length on LES for the flowfield with large vortex structure. In: Proceedings of 54th AIAA Aerospace Sciences Meeting (2016)Google Scholar
  4. 4.
    Kim, Y., Xie, Z.-T.: Modelling the effect of freestream turbulence on dynamic stall of wind turbine blades. Comput. Fluids 129, 53–66 (2016)MathSciNetCrossRefGoogle Scholar
  5. 5.
    Leishman, J.G.: Challenges in modeling the unsteady aerodynamics of wind turbines. In: 21st ASME Wind Energy Symposium, Reno, NV, USA, pp. 85–132 (2002)Google Scholar
  6. 6.
    Maheu, N., Moureau, V., Domingo, P., Duchaine, F., Balarac, G.: Large-eddy simulations of flow and heat transfer around a low-Mach number turbine blade. In: Proceedings of the Summer Program 2012, Center for Turbulence Research (2012)Google Scholar
  7. 7.
    Moureau, V., Domingo, P., Vervisch, L.: Design of a massively parallel CFD code for complex geometries. Comptes Rendus Mécanique 339(2), 141–148 (2011)CrossRefGoogle Scholar
  8. 8.
    Nicoud, F., Ducros, F.: Subgrid-scale stress modelling based on the square of the velocity gradient tensor. Flow, Turbul. Combust. 62, 183–200 (1999)CrossRefGoogle Scholar
  9. 9.
    van Rooij, R.P.J.O.M.: Modification of the boundary layer calculation in RFOIL for improved airfoil stall prediction. In: Report IW-96087R TU-Delft, the Netherlands (1996)Google Scholar
  10. 10.
    You, D., Bromby, W.: Large-eddy simulation of unsteady separation over a pitching airfoil at high Reynolds number. In: Proceedings of ICCFD7, Big Island, Hawaiii (2012)Google Scholar

Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • F. Barnaud
    • 1
    Email author
  • P. Bénard
    • 1
  • G. Lartigue
    • 1
  • V. Moureau
    • 1
  • P. Deglaire
    • 2
  1. 1.CORIA, CNRS UMR 6614Normandie Université, INSA and University of RouenSaint-Étienne-du-RouvrayFrance
  2. 2.AdwenPuteauxFrance

Personalised recommendations