Hybrid RANS/LES Capabilities of the Flow Solver FLOWer—Application to Flow Around Wind Turbines

  • Pascal WeihingEmail author
  • Johannes Letzgus
  • Galih Bangga
  • Thorsten Lutz
  • Ewald Krämer
Conference paper
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 137)


The compressible block-structured flow solver FLOWer of the German Aerospace Center (DLR) has been extended towards state of the art detached-eddy simulation (DES) methods in order to conduct hybrid RANS/LES simulations of flow around rotary wings. The large-eddy simulation (LES) capabilities of the code are demonstrated for decaying isotropic turbulence. Excessive numerical dissipation is avoided by using the fifth-order WENO scheme and an appropriate low-Mach number correction. The DES implementations are validated first for the well documented test cases backward facing step and NACA0021 airfoil at \(60^\circ \) incidence, before increasing the complexity by simulating the flow around the MEXICO model wind turbine operating in stalled conditions and comparing with experimental data. From the latter, recommendations on the numerical settings are derived to successfully set up eddy resolving simulations for wind turbine or helicopter applications.



The authors acknowledge the German Federal Ministry for Economic Affairs and Energy for funding this studies in the framework of the German joint research project Assist and the High Performance Computing Center Stuttgart for providing computational resources.


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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  • Pascal Weihing
    • 1
    Email author
  • Johannes Letzgus
    • 1
  • Galih Bangga
    • 1
  • Thorsten Lutz
    • 1
  • Ewald Krämer
    • 1
  1. 1.Institute of Aerodynamics and Gas DynamicsStuttgartGermany

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