The ASCI/Alliances Center for Astrophysical Thermonuclear FlashesThe University of Chicago

Type Ia Supernovae and Cosmology

M ~ 0.3, ~ 0.7Smoldering

• Subsonic convection in core of white dwarf• Anelastic module or limited study with compressible flash• Conductive heat transport

Lightcurve• Free expansion of envelope• Multi-group (non-LTE) radiation transport

Flame• Initially compressible deflagration• DDT or expansion/recollapse• Flash (compressible module) with appropriate sub-grid model and front-tracking• Conductive heat transport

~1000 yr

Ignition

~seconds

The ASCI/Alliances Center for Astrophysical Thermonuclear FlashesThe University of Chicago

Flash Capabilities for Type Ia Supernovae

Compressible Hydrodynamics Adaptive Mesh Refinement (AMR) Numerous Equations of State Self-Gravity (multipole, multigrid) Cartesian, Cylindrical, and Spherical Geometries

Advection-Diffusion Flame ModelNumerous Nuclear Reaction Networks

Monte Carlo 3-D Radiation Transfer

The ASCI/Alliances Center for Astrophysical Thermonuclear FlashesThe University of Chicago

Computational Needs for Type Ia Supernova Simulations

500 Teraflop hours per simulation x 20 simulations = 10 Petaflop hours

1 Terabyte of memory

100 Gigabyte check point files

2.5 Terabyte movie files