Instabilities of protostellar cores. The influence of adaptive grids on instabilities of first protostellar cores

Details Instabilities of protostellar cores. The influence of adaptive grids on instabilities of first protostellar cores Instabilities of protostellar cores. The influence of adaptive grids on instabilities of first protostellar cores

Publishing date

May 1994

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...285..897k&link_type=abstract

Journals

Astronomy and Astrophysics 285, 897-902 (1994)

Science

Astronomy and Astrophysics

Field

Astrophysics

Additional info 2

5

Additional info 3

Numerical Methods, Stars: Formation, Hydrodynamics, Instabilities

Type

Scientific paper

Abstract

It is shown that the destructive instabilities of first protostellar cores as described by Balluch (Bal 91c) are numerical artefacts. The instabilities are caused by the implicit adaptive grid causing strong grid motion inside the core to resolve dust destruction fronts and thereby introducing advection errors. Test calculations using the numerical method of Balluch were carried out with simplified constitutive relations which avoid the κ-mechanism that was made responsible for the instabilities. In these test calculations the grid motion is introduced artificially to demonstrate its influence. Thereby it was possible to reproduce the core explosions. It is also shown that using realistic material functions the destructive instabilities vanish if the opacity is removed from the grid equation. But luminosity variations upstream from the shock as predicted by the linear stability analysis by Balluch (Bal 91b) are still present.

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