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Theoretical and Computational Fluid Dynamics

, Volume 12, Issue 2, pp 73–90 | Cite as

Mach Wave Radiation by Mixing Layers. Part I: Analysis of the Sound Field

  • E.J. Avital
  • N.D. Sandham
  • K.H. Luo

Abstract:

In Part I a wave packet model is used to show that a time-developing mixing layer produces a Mach wave pattern similar to the one produced by a spatial-developing mixing layer. However, this kind of similarity does not exist for the sound emitted by subsonic sound sources. A method to analyse temporal direct numerical simulation (DNS) results for the Mach wave pattern is then developed and demonstrated using numerical results of the wave-packet model. The method is applied to the temporal DNS results of a supersonic mixing layer undergoing transition to turbulence. Two dominant Mach waves are revealed. The first wave originates from about the time of the Λ-vortex structure dominance in the layer. The second wave appears just prior to the final breakdown of the layer to a fine-scale turbulence structure. The second wave shows a higher level of a finite-amplitude wave behaviour and a smaller-scale source structure than the first wave. Directivity plots and frequency spectra are provided and discussed.

Keywords

Wave Packet Direct Numerical Simulation Sound Source Wave Radiation Turbulence Structure 
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-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • E.J. Avital
    • 1
  • N.D. Sandham
    • 1
  • K.H. Luo
    • 1
  1. 1.Queen Mary and Westfield College, Mile End Road, London E1 4NS, EnglandGB

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