1. The ASCI/Alliances Center for Astrophysical Thermonuclear Flashes The University of Chicago Type Ia Supernovae and Cosmology  M ~ 0.3,   ~ 0.7 Smoldering 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

2. The ASCI/Alliances Center for Astrophysical Thermonuclear Flashes The 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 Model Numerous Nuclear Reaction Networks Monte Carlo 3-D Radiation Transfer

3. The ASCI/Alliances Center for Astrophysical Thermonuclear Flashes The 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