Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,
Tel (Office): (865) 574-6124 (FAX): (865) 574-1268
Stellar explosions come in a wide variety, powered by either by gravitational collapse or thermonuclear energy release. These are truly multi physics problems – modeling them requires the coordinate input of gravity solvers, reaction networks, transport, and hydrodynamics together with microphysics recipes to describe the physics of matter under extreme conditions. Furthermore, these models involve following a wide range of spatial and temporal scales, which puts tough demands on simulation codes. As a result, a variety of methods have been developed to model the different phases of these explosions. In this talk, I describe the suite of codes built around the BoxLib adaptive mesh refinement framework: Maestro, suited for modeling subsonic flows that precede the explosions, and Castro, which models the (radiation-driven) explosive phases.
I will show examples from both Maestro and Castro, including models of convection in X-ray bursts, the pre-explosion phase of both the Chandra and sub-Chandra model of Type Ia supernova, and ongoing work on merging white dwarfs. I will also discuss the current
computational challenges and future algorithmic directions of both codes.
Contact: Alfredo Galindo-Uribarri, (865) 574-6124