Diffusion in supersonic, turbulent, compressible flows

Details Diffusion in supersonic, turbulent, compressible flows Diffusion in supersonic, turbulent, compressible flows

2003-02-25

arxiv.org/abs/astro-ph/0302527v1

Phys.Rev. E67 (2003) 046311

Astronomy and Astrophysics

Astrophysics

11 pages, incl. 5 figures, accepted for publication in Physical Review E (a high-resolution version is available at http://w

Scientific paper

10.1103/PhysRevE.67.046311

We investigate diffusion in supersonic, turbulent, compressible flows. Supersonic turbulence can be characterized as network of interacting shocks. We consider flows with different rms Mach numbers and where energy necessary to maintain dynamical equilibrium is inserted at different spatial scales. We find that turbulent transport exhibits super-diffusive behavior due to induced bulk motions. In a comoving reference frame, however, diffusion behaves normal and can be described by mixing length theory extended into the supersonic regime.

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