SNSPH: A parallel three-dimensional smoothed particle radiation hydrodynamics code

We provide a description of the SNSPH code-a parallel three-dimensional radiation hydrodynamics code implementing tree code gravity, smooth particle hydrodynamics, and flux-limited diffusion transport schemes. We provide descriptions of the physics and parallelization techniques for this code. We present performance results on a suite of code tests ( both standard and new), showing the versatility of such a code, but focusing on what we believe are important aspects of modeling core-collapse supernovae.