Dr. P. Chris Fragile



Cosmos++ is a massively parallel, multi-dimensional, fully covariant, modern object-oriented (C++) magnetohydrodynamics code written to support structured and unstructured adaptively refined meshes, and for both Newtonian and general relativistic astrophysical applications. It includes numerous hydrodynamics solvers (conservative and non-conservative), magnetic fields (ideal and non-ideal), radiation multi-group flux-limited diffusion, a network of more than 30 chemical gas-phase reactions, relativistic scalar (inflaton) fields for the early universe, isotropic FRW cosmologies, radiative cooling, dark matter particles, self-gravity, geodesic transport, and generic tracer fields.

A number of validation tests of the physics packages within Cosmos and Cosmos++ are presented in the literature (Anninos & Fragile, 2003; Anninos et al., 2003, 2005). In Anninos et al. (2005) we demonstrate the robustness of the numerical algorithms and adaptive mesh framework of Cosmos++ over a wide spectrum of standard problems, boosts, and astrophysical applications, including relativistic shock tubes, shock collisions, magnetosonic shocks, Alfven wave propagation, blast waves, magnetized Bondi flow, and the magneto-rotational instability (MRI) in Kerr black-hole spacetimes.

At this point Cosmos++ is a mature and well-tested code. It has recently been released to the general scientific community, and has been ported successfully to more than a dozen computing platforms, including ASCI Blue, ASCI Frost, Berg, GPS, Thunder, MCR, and Zeus at Lawrence Livermore National Laboratory, plus the Teragrid at the National Center for Supercomputing Applications, the NASA Columbia and Cosmos machines, and the parallel Linux cluster at the College of Charleston. It is actively used by many scientists and researchers at more than a half-dozen universities to study such diverse problems as bar-mode instabilities in compact stars, magnetized black-hole accretion flows, supernova enrichment of the intergalactic medium, quark-hadron phase transitions in the early universe, jet-induced star formation, magneto-rotational effects in collapsing stars, and gamma-ray burst afterglows.


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updated: 29-Sep-12