Turbulent diffusivity

Details Turbulent diffusivity Turbulent diffusivity

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...193..313c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 313-326.

Astronomy and Astrophysics

Astrophysics

16

Galactic Evolution, Gas Flow, Solar Corona, Turbulent Diffusion, Chemical Evolution, Equations Of Motion, Kolmogoroff Theory, Solar Neutrinos

Scientific paper

The authors treat two problems. First, given a passive scalar (e.g., a particle) embedded in an otherwise turbulent medium, and responding to it via frictional forces, they derive an expression for its turbulent velocity, as well as for the components of the turbulent diffusivity tensor Dij for an axisymmetric case. These formulae are relevant to the problem of grain sedimentation in the primitive solar nebula. Second, when the velocity of the contaminant coincides with that of the fluid, it is shown that the diffusivity tensor becomes diagonal, i.e., Dij = DTδij and an expression for DT is provided. This quantity is of interest, for example, to the astrophysical case of mixing in the interior of the sun.

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