Computer Science – Sound
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21812707m&link_type=abstract
American Astronomical Society, AAS Meeting #218, #127.07; Bulletin of the American Astronomical Society, Vol. 43, 2011
Computer Science
Sound
Scientific paper
A critical component behind a supernova explosion is the spherical accretion shock instability, or SASI. Two theories describing this mechanism exist. An advective-acoustic mechanism says that entropy perturbations generated at the shock travel inward with the accretion flow at the free-fall velocity, which couple to an acoustic wave. If these perturbations amplify, the advective and acoustic waves lead to an instability. The acoustic theory states that the SASI is purely an acoustic phenomenon in which a sound wave travels around the circumference of the shock. This project attempts to resolve the debate between the two theories by observing the SASI in a regime where the timescales become disparate. Because the sound speed behind the shock is determined by the gravitational potential and the post shock flow speed is a strong function of the ratio of specific heats, gamma, the advective-acoustic mechanism has a much longer timescale for small values of gamma. We find that the timescales become highly disparate when gamma equals 1.2 and use two-dimensional simulations when gamma is 1.2 to quantify the growth rate of the instability. This will allow us to determine whether the SASI operates as an advective-acoustic or purely acoustic phenomenon.
Blondin John
Melton Cody
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