Instability of a nonuniform compressible gas with self-gravity

Details Instability of a nonuniform compressible gas with self-gravity Instability of a nonuniform compressible gas with self-gravity

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1242..355s&link_type=abstract

PLASMAS IN THE LABORATORY AND THE UNIVERSE: Interactions, Patterns, and Turbulence. AIP Conference Proceedings, Volume 1242, pp

Other

Disperse Systems, Viscosity, Convection, Acoustic Wave Effects, Quantum Optical Phenomena In Absorbing, Dispersive And Conducting Media, Viscosity, Diffusion, And Thermal Conductivity, Natural Convection, Ray Acoustics

Scientific paper

For the case of nonuniform gas with viscosity and gravity, a dispersion relation was obtained for the perturbations whose wave vector is directed along the density gradient. The gravitational-convective perturbations were shown to be locally instable in a non-viscous isothermal gas over the entire spectrum of wave vectors. This leads to instability of the gas stationary distributions. Solving the initial-boundary value problems of non-stationary dynamics of isothermal gas requires regularization by, e.g., viscosity. Viscosity does not hinder the growth of the Jeans part of gravitational-convective instability. Numerical experiments based on a completely three-dimensional transient code demonstrated the development of collapse in isothermal cloud.

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