DNS of Compressible Inert and Infinitely Fast Reacting Mixing Layers

  • Inga Mahle
  • Jörn Sesterhenn
  • Rainer Friedrich
Conference paper
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design (NNFM) book series (NNFM, volume 96)


This paper deals with the effects of heat release and compressibility on temporally evolving, turbulent mixing layers. Direct Numerical Simulations (DNS) of such layers at two different convective Mach numbers are performed with and without combustion which allows to study the effects of heat release and compressibility separately and combined. It is shown that both, compressibility and heat release, dampen the turbulence activity and lead to a reduced growth of the mixing layer. Alterations in pressure fluctuations are a main reason for the changes. The effects of compressibility are not as strong in the reacting mixing layer as in the inert one. A significant difference between the inert and the reacting mixing layers at high convective Mach number is that entropic density fluctuations prevail over the acoustic ones when reaction takes place while both contribute to nearly equal parts in the non-reacting compressible flow.


Heat Release Direct Numerical Simulation Mixture Fraction Reynolds Shear Stress Momentum Thickness 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2007

Authors and Affiliations

  • Inga Mahle
    • 1
  • Jörn Sesterhenn
    • 1
  • Rainer Friedrich
    • 1
  1. 1.Fachgebiet StrömungsmechanikTU MünchenGarchingGermany

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