Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh52a0475b&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SH52A-0475
Astronomy and Astrophysics
Astronomy
7524 Magnetic Fields, 7539 Stellar Astronomy, 7544 Stellar Interiors And Dynamo Theory
Scientific paper
The connection between the generation of magnetic field by dynamo processes in stellar interiors and the signatures of magnetic activity observed in stellar atmospheres is not well understood. This is especially true in fully convective stars such as M/L dwarfs and T Tauri stars, where the observed solid body rotation precludes the generation of field by velocity shear mechanisms common to many mean field dynamo theories. These stars show a high level of magnetic activity so that an alternate mechanism, such as a small scale turbulent dynamo, is responsible for the generation of the magnetic field in the stellar interior. To model the interaction between turbulent convection and magnetic field deep in the interior of stars, it is necessary to consider a gravitationally stratified atmosphere in a spherical geometry. It it not yet feasible with current computing resources to run fully compressible, global, spherical MHD simulations; however, it is possible to simulate models based on the anelastic approximation to the fully compressible MHD equations. The anelastic approximation only treats density perturbations in the buoyancy force, permitting larger simulation timesteps by filtering out acoustic waves. We report on the development of a 3-d spherical anelastic MHD code, ``SANMHD''. The design of SANMHD is to be portable across multiple architectures ranging from PC workstations to massively parallel supercomputers. The code is also highly modular to facilitate the investigation of a variety physical scenarios. The code spectrally decomposes physical variables in the polar and azimuthal directions while using finite differencing schemes in the radial direction; this allows stellar interior models to be used as a background reference state. SANMHD uses an ideal equation of state and includes rotation and a radiative heat flux.
Bercik David John
Fisher George H.
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