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Forced Synthetic Turbulence Approach to Stimulate Resolved Turbulence Generation in Embedded LES

  • Daniela G. FrancoisEmail author
  • Rolf Radespiel
  • Axel Probst
Conference paper
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 130)

Abstract

A synthetic turbulence generator is implemented in the DLR TAU-Code, to reduce the grey area that is typical for embedded LES approaches. The selected synthetic turbulence generator builds up a velocity field of fluctuations that reproduces the anisotropy and non-homogeneity of the boundary layer taken as reference from the RANS solution. In addition, the generator is significantly improved in order to reduce the numerical divergence of the generated velocity field and also to provide convective motion of the synthetic eddies. The implementation was tested in a flat plate boundary layer and verified against experimental data for the HGR-01 airfoil. The results show that the implementation shortens the transition distance to fully developed turbulence. The obtained flow profiles for the HGR-01 airfoil compare nicely to available PIV data.

Keywords

Spanwise Direction Skin Friction Coefficient Detach Eddy Simulation Attached Boundary Layer Physical Time Step 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors gratefully thank the “Deutsche Forschungsgemeinschaft” (DFG) for funding this research within the DFG FOR1066 Research unit and the “NorddeutscheVerbundfür Hoch- und Höchstleistungsrechnen” (HLRN) for providing the computer resources that enabled the simulations presented here.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  • Daniela G. Francois
    • 1
    Email author
  • Rolf Radespiel
    • 1
  • Axel Probst
    • 2
  1. 1.Institute of Fluid MechanicsTechnische Universität BraunschweigBraunschweigGermany
  2. 2.Institute of Aerodynamics and Flow TechnologyDLRGöttingenGermany

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