A note on the validity of the diffusion approximation in fast-moving media

Details A note on the validity of the diffusion approximation in fast-moving media A note on the validity of the diffusion approximation in fast-moving media

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352l..53n&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 352, April 1, 1990, p. L53, L54.

Statistics

Computation

Computational Astrophysics, Diffusion, Mean Free Path, Radiative Transfer, Stellar Mass Accretion, Black Holes (Astronomy), Neutron Stars, Photons, Stellar Structure

Scientific paper

The problem of the range of validity of the diffusion approximation in
fast-moving media is reconsidered in the wake of some arguments which
have appeared in the literature. It is shown that the approximation is
satisfied once the photon mean free path is much shorter than the
characteristic length scale, independently of the inflow velocity.

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