| Type |
Conference Paper |
| Names |
Benjamin Brown, G. M. Vasil, D. Lecoanet, E. G. Zweibel |
| Proceedings Title |
Bulletin of the American Astronomical Society |
| Conference Name |
American Astronomical Society, AAS Meeting #220, #328.02 |
| Volume |
220 |
| Date |
May 1, 2012 |
| URL |
http://adsabs.harvard.edu/abs/2012AAS...22032802B |
| Library Catalog |
NASA ADS |
| Abstract |
In the deep stellar interiors, flows are typically much slower than the
local speed of sound. Owing to this, simulations of stellar convection
and dynamo action typically employ various "sound-proof" equations,
which filter the fast sound waves but can follow the subsonic convective
flows. These sound-proof equations include the anelastic equations,
which typically are derived in adiabatically-stratified stellar
convection zones, and the pseudo-incompressible equations. In stars like
the Sun, the radiative zone underlying the convection zone is a region
of stable subadiabatic stratification, where motions remain highly
subsonic and gravity waves dominate the dynamics. We study the
application of sound-proof equations to dynamics in stellar radiative
zones. We find that some formulations fail to conserve energy in regions
of stable stratification and consequently do not correctly capture the
dynamics of gravity waves. We provide a mapping to equations that do
conserve energy. We discuss gravity wave dynamics in stably-stratified
stellar regions in the context of simulations of stars like the Sun, and
also consider more massive stars, where the radiative envelope lies
above a convective core. |