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Diffusion in supersonic turbulent compressible flows.

Ralf S Klessen1, Douglas N C Lin

  • 1Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany. rklessen@aip.de

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 6, 2003
PubMed
Summary

Turbulent transport in supersonic flows shows superdiffusion due to bulk motion. However, in a comoving frame, diffusion is normal and explained by extended mixing-length theory.

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Area of Science:

  • Fluid dynamics
  • Plasma physics
  • Astrophysics

Background:

  • Supersonic turbulence is characterized by interacting shocks.
  • Understanding turbulent transport is crucial for various physical phenomena.

Purpose of the Study:

  • To investigate diffusion in supersonic turbulent compressible flows.
  • To analyze the behavior of turbulent transport under different conditions.

Main Methods:

  • Simulating supersonic turbulent compressible flows.
  • Varying root-mean-square Mach numbers.
  • Modifying energy insertion scales.

Main Results:

  • Turbulent transport exhibits superdiffusive behavior.
  • Superdiffusion is attributed to induced bulk motions.
  • Normal diffusion is observed in a comoving reference frame.

Conclusions:

  • Supersonic turbulent diffusion can be described by an extended mixing-length theory.
  • The study provides insights into the fundamental nature of supersonic turbulence.

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