Simulating gravitational motion, gas dynamics, and structure in the cosmos
Instrumentation and Methods for Astrophysics
2023-06-07 v2 Astrophysics of Galaxies
Abstract
We provide introductory explanations and illustrations of the -body hydrodynamics code Charm N-body GrAvity solver (ChaNGa). ChaNGa simulates the gravitational motion and gas dynamics of matter in space, with the goal of modeling galactic and/or cosmological structure and evolution. We discuss the algorithm for leapfrog integration and smoothed particle hydrodynamics and computer science concepts used by the program, including the binary data structure for the particle positions. Our presentation borrows from the doctoral dissertation of J.\ G.\ Stadel. Problems are provided in order to use ChaNGa to learn or solidify some cosmological concepts.
Cite
@article{arxiv.2302.01895,
title = {Simulating gravitational motion, gas dynamics, and structure in the cosmos},
author = {J. W. Powell and L. Caudill and O. Young},
journal= {arXiv preprint arXiv:2302.01895},
year = {2023}
}
Comments
Accepted by the American Journal of Physics. Two important supplementary documents are included