2013/01/18 by Ann Almgren, John Bell, Mike Lijewski +2 · 1 citation
Physics and Astronomy · #astro-ph.CO #astro-ph.IM
paper · pdf · doi:10.1088/0004-637x/765/1/39
Accepted for publication in The Astrophysical Journal
arxiv created 2013/01/18 · arxiv updated 2015/06/12
We present a new N-body and gas dynamics code, called Nyx, for large-scale cosmological simulations. Nyx follows the temporal evolution of a system of discrete dark matter particles gravitationally coupled to an inviscid ideal fluid in an expanding universe. The gas is advanced in an Eulerian framework with block-structured adaptive mesh refinement (AMR); a particle-mesh (PM) scheme using the same grid hierarchy is used to solve for self-gravity and advance the particles. Computational results demonstrating the validation of Nyx on standard cosmological test problems, and the scaling behavior of Nyx to 50,000 cores, are presented.