Zonal RANS-LES Computation for Near-Stall-Airfoil Flow

  • Benedikt RoidlEmail author
  • Koen J. Geurts
  • Wolfgang Schröder
Conference paper
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 131)


A fully coupled zonal Reynolds-averaged Navier-Stokes - large-eddy simulation method (zonal RANS-LES) is applied to subsonic flow over the HGR-01 airfoil at high angle of attack. Several zonal-boundary formulations such as forcing layers, a reformulated synthetic turbulent generation method, and a turbulent reconstruction approach are discussed. It is shown that the aerodynamic properties are satisfactorily predicted and the computational costs for a subsonic airfoil near stall compared to a pure LES are decreased by a factor of approximately four. Nevertheless, it has to be stated that the local RANS solution has a non-negligible impact on the susceptible flow phenomena such as the separation when the RANS-LES boundary is located in a non-zero pressure gradient flow regime. This RANS impact is even more pronounced when a pressure driven coupling between an LES-RANS and a RANS-LES boundary exists.


Turbulent Kinetic Energy Adverse Pressure Gradient Aerodynamic Property Laminar Separation Bubble RANS Simulation 
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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Benedikt Roidl
    • 1
    Email author
  • Koen J. Geurts
    • 1
  • Wolfgang Schröder
    • 1
  1. 1.Institute of AerodynamicsRWTH Aachen UniversityAachenGermany

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