Hybrid LES-RANS: Inlet Boundary Conditions for Flows with Recirculation

  • Lars Davidson
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 97)


The paper evaluates a new method for prescribing synthesized turbulent inlet boundary conditions. When making LES, DES or hybrid LES-RANS, a precursor channel DNS is often used. The disadvantage of this method is that it is difficult to re-scale the DNS fluctuations to higher Reynolds numbers. In the present work, synthesized isotropic turbulent fluctuations are generated at the inlet plane with a prescribed turbulent length scale and energy spectrum. A large number of independent realizations are generated. A correlation in time between these realizations is introduced via an asymmetric, non-truncated time filter. In this way the turbulent time scale of the synthesized isotropic turbulent fluctuations is prescribed.


Large Eddy Simulation Resolve Shear Stress Spanwise Direction Inlet Boundary Condition Inlet Plane 
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© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • Lars Davidson
    • 1
  1. 1.Chalmers University of TechnologySweden

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