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Noncommuting Filters and Dynamic Modelling for Les of Turbulent Compressible Flow in 3D Shear Layers

  • B. Geurts
  • B. Vreman
  • H. Kuerten
  • R. Van Buuren
Conference paper
Part of the ERCOFTAC Series book series (ERCO, volume 5)

Abstract

Large-eddy simulation of complex turbulent flows involves the filtering and modelling of small scale flow structures whose intensity shows large spatial variations in the flow domain. This suggests the use of filters with nonuniform filterwidth. Such filters fail to commute with spatial derivatives and give rise to additional ‘noncommutation’ terms in LES. We construct higher order filters and show that the subgrid terms and the new noncommutation terms are a priori of comparable magnitude. We apply these filters to DNS data of the temporal mixing layer. The magnitude of the noncommutation terms and their contribution to the kinetic energy dynamics is determined. Finally, we show that LES predictions significantly depend on the specific explicit filter used in dynamic subgrid modelling.

Keywords

Large Eddy Simulation Order Filter Direct Numerical Simulation Data High Order Filter Complex Turbulent Flow 
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.

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Copyright information

© Springer Science+Business Media Dordrecht 1997

Authors and Affiliations

  • B. Geurts
    • 1
  • B. Vreman
    • 1
  • H. Kuerten
    • 1
  • R. Van Buuren
    • 1
  1. 1.Department of Applied MathematicsUniversity of TwenteEnschedeThe Netherlands

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