The possibility of negative diffusion in a compressible turbulent medium

Details The possibility of negative diffusion in a compressible turbulent medium The possibility of negative diffusion in a compressible turbulent medium

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pazh...16..854s&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 16, Sept. 1990, p. 854-862. In Russian. In Russian.

Statistics

Computation

1

Celestial Bodies, Celestial Mechanics, Compressible Fluids, Turbulent Diffusion, Computational Astrophysics, Diffusion Coefficient, Interstellar Magnetic Fields, Temperature Distribution

Scientific paper

An investigation is conducted of the diffusion of an admixed scalar field in a compressible medium with isotropic, homogenous, and stationary turbulence. The velocity field of turbulent motion u (r,t) is assumed to be known, while the reciprocal influence of the admixed field on u (r,t) is neglected. It is shown that the compressibility of the medium may give rise to negative values of the turbulent diffusivity. It is suggested that the negative-diffusion phenomenon can be used for to explain the speckled distribution of concentration, temperature, and magnetic field in various celestial bodies.

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