Advertisement

Scrutinizing Velocity and Pressure Coupling Conditions for LES with Downstream RANS Calculations

  • Dominic von Terzi
  • Wolfgang Rodi
  • Jochen Fröhlich
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 97)

Abstract

A RANS calculation is connected to an upstream LES via explicit coupling conditions at a pre-defined interface. The role of the interface is to allow for mean flow information to propagate upstream and for fluctuations to leave the LES domain without reflections. To this end, the mean velocity is directly coupled across the domain boundaries whereas the fluctuations at the downstream end of the LES zone are treated using either the so-called enrichment strategy (Quéméré & Sagaut, 2002) or a parameter-free generalization of this method based on a convective condition (von Terzi, Fröhlich & Mary, 2006). For incompressible flows, both techniques require a complementary coupling condition for the pressure or an equivalent variable enforcing continuity. Two distinct techniques are investigated: (i) The instantaneous pressure is computed in a coupled fashion for the union of the LES and RANS domains and (ii) the pressure is completely decoupled and mass conservation across the interface is ensured by an adjustment of the velocities on both sides. The performance of the different methods is scrutinized for turbulent channel flow and the flow over periodic hills. It was found that the convective condition with decoupled pressure fields and an explicit mass flux correction was the most robust technique delivering results of equal or increased quality in comparison to other combinations considered.

Keywords

Streamwise Velocity Turbulent Channel Flow Pressure Coupling RANS Calculation Periodic Hill 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Breuer, M., Jaffrézic, B.: New reference data for the hill flow test case (2005), http://www.hy.bv.tum.de/DFG-CNRS/
  2. Fröhlich, J., et al.: Highly resolved large-eddy simulation of separated flow in a channel with streamwise periodic constrictions. J. Fluid Mech. 526, 19–66 (2005)zbMATHCrossRefMathSciNetGoogle Scholar
  3. Hinterberger, C.: Dreidimensionale und tiefengemittelte Large-Eddy-Simulation von Flachwasserströmungen. PhD thesis, University of Karlsruhe (2004) Google Scholar
  4. Mellen, C.P., Fröhlich, J., Rodi, W.: Large eddy simulation of the flow over periodic hills. In: Proceedings of 16th IMACS World Congress, Lausanne, Switzerland (2000)Google Scholar
  5. Moser, R.D., Kim, J., Mansour, N.N.: Direct numerical simulation of turbulent channel flow up to Reτ=590. Phys. Fluids 11, 943–945 (1999)CrossRefGoogle Scholar
  6. Pierce, C.D., Moin, P.: Large Eddy Simulation of a confined coaxial jet with swirl and heat release. AIAA paper 98-2892 (1998)Google Scholar
  7. Quéméré, P., Sagaut, P.: Zonal multi-domain RANS/LES simulations of turbulent flows. Int. J. Num. Meth. Fluids 40, 903–925 (2002)zbMATHCrossRefGoogle Scholar
  8. Tannehill, J.C., Anderson, D.A., Pletcher, R.H. (eds.): Computational Fluid Mechanics and Heat Transfer, ch. 4.2.5, 2nd edn. Taylor & Francis, Abington (1997)Google Scholar
  9. von Terzi, D.A., Fröhlich, J.: Coupling conditions for LES with downstream RANS for the prediction of incompressible turbulent flows. In: Proceedings of Turbulence and Shear Flow Phenomena 5 Conference, Munich, Germany (2007)Google Scholar
  10. von Terzi, D.A., Fröhlich, J., Mary, I.: Zonal coupling of LES with downstream RANS calculations. Theoret. Comput. Fluid Dynamics (submitted, 2006)Google Scholar
  11. von Terzi, D.A., et al.: LES with downstream RANS for flow over periodic hills and a model combustor flow. In: EUROMECH Colloquium 469, Large-Eddy Simulation of Complex Flows, October 6–8, 2005, TU Dresden, Germany (2005)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • Dominic von Terzi
    • 1
  • Wolfgang Rodi
    • 1
  • Jochen Fröhlich
    • 2
  1. 1.University of KarlsruheGermany
  2. 2.Technical University of DresdenGermany

Personalised recommendations