Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sf2a.conf..175s&link_type=abstract
SF2A-2009: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, held 29 June - 4 July 2009 in
Astronomy and Astrophysics
Astrophysics
Scientific paper
We perform numerical simulations of a toy model proposed by Foglizzo (2009) to explain the mechanism of the standing accretion shock instability (SASI), and confirm the results of the linear analysis. Three types of simulations have been performed, measuring (i) the acoustic feedback resulting from the advection of entropy/vorticity in a region of deceleration, (ii) the advected wave generated at a shock perturbed by an acoustic wave, and (iii) the growth rate and oscillation frequency of the dominant advective-acoustic cycle in the linear regime. The results of the simulations agree with the linear analysis within 5% when the mesh size is 1% of the distance between the shock and the deceleration region, with a numerical error dominated by the numerical treatment of the shock. This simple toy model can be used as a benchmark test for numerical codes dealing with SASI simulations.
Foglizzo Thierry
Fromang Sebastien
Sato Joe
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