Linear transport in fully stratified discs

Details Linear transport in fully stratified discs Linear transport in fully stratified discs

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mnras.406..551v&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 406, Issue 1, pp. 551-557.

Astronomy and Astrophysics

Astronomy

1

Accretion, Accretion Discs, Convection, Hydrodynamics, Instabilities

Scientific paper

We consider the evolution of linear non-axisymmetric perturbations in discs with radially and vertically stratified equilibria. We work in the shearing sheet and Boussinesq approximations. We choose density and pressure equilibrium fields compatible with a background flow depending only on the radial pseudo-Cartesian coordinate x. We find that, for unstable vertical and radial stratifications, trailing waves can transport angular momentum outwardly. This occurs when entropy gradients with respect to x and z coordinates have the same sign and the wavenumbers ratio kz/ky is less than a critical value, which depends on the radial Richardson number and the shear parameter.

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