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Assessment of Local LES-Resolution Sensors for Hybrid RANS/LES Simulations

  • S. ReußEmail author
  • T. Knopp
  • A. Probst
  • M. Orlt
Conference paper
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 130)

Abstract

Different sensors that provide a measure for the resolution of the LES content in hybrid RANS/LES computations are proposed and investigated. In an a-priori test on isotropic turbulence a suitable sensor is identified. Based on that sensor an automatic local mesh refinement is performed for an IDDES of the flow over a backward facing step. The results obtained on locally adapted grids are compared to results on globally refined grids. It is shown, that the proposed sensors can detect underresolved LES regions and that the local mesh refinement can help to reduce resolution errors caused by a too coarse grid spacing.

Keywords

Turbulent Kinetic Energy Refined Grid RANS Model Filter Width Refined Region 
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 acknowledge the “Deutsche Forschungsgemeinschaft" (German Research Foundation) who funded this work in the scope of the Research Group DFG FOR 1066.

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Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.Institute of Aerodynamics and Flow Technology DLR (German Aerospace Center)GöttingenGermany

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