Hybrid RANS/LES Investigation of the Interaction of a Longitudinal Vortex with an Inclined Airfoil

  • S. ProbstEmail author
  • T. Landa
  • T. Knopp
  • R. Radespiel
Conference paper
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 143)


The interaction of a generic longitudinal wake vortex with an HGR-01 single-element airfoil is simulated with hybrid RANS/LES and compared with reference RANS results. The influence of different grid types in the vortex transport region, either structured hexahedral grid cells or unstructured tetrahedral cells, is shown to be insignificant. Moreover, two modeling approaches of the RANS and LES regions around the airfoil are compared: Firstly, the turbulence in the entire boundary layer is modeled with the RANS approach. Secondly, the turbulence in the boundary layer is partly resolved with the wall-modeled LES approach using synthetic turbulence at the RANS/LES interface. It is found that in the first setup the interaction of the vortex with the boundary layer is weaker than in the second setup with wall-modeled LES, however, the mean flow is comparable in both cases.


Hybrid RANS/LES Vortex-airfoil interaction Synthetic turbulence 



The authors gratefully acknowledge the German Research Foundation (DFG) for funding this research activity (grant numbers KN 888/2-1 and RA 595/25-1). Computer resources for this project have been provided by the Gauss Center for Supercomputing/Leibniz Supercomputing Center under grant: pn69mu.


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© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.German Aerospace Center (DLR)Institute of Aerodynamics and Flow TechnologyGöttingenGermany
  2. 2.Institute of Fluid MechanicsTechnische Universität BraunschweigBraunschweigGermany

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