A hydrodynamic approach to cosmology - Methodology

Details A hydrodynamic approach to cosmology - Methodology A hydrodynamic approach to cosmology - Methodology

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...78..341c&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 78, Feb. 1992, p. 341-364.

Statistics

Computation

258

Computational Astrophysics, Cosmology, Hydrodynamic Equations, Dark Matter, Helium, Hydrogen, Photoionization, Recombination Coefficient

Scientific paper

The present study describes an accurate and efficient hydrodynamic code for evolving self-gravitating cosmological systems. The hydrodynamic code is a flux-based mesh code originally designed for engineering hydrodynamical applications. A variety of checks were performed which indicate that the resolution of the code is a few cells, providing accuracy for integral energy quantities in the present simulations of 1-3 percent over the whole runs. Six species (H I, H II, He I, He II, He III) are tracked separately, and relevant ionization and recombination processes, as well as line and continuum heating and cooling, are computed. The background radiation field is simultaneously determined in the range 1 eV to 100 keV, allowing for absorption, emission, and cosmological effects. It is shown how the inevitable numerical inaccuracies can be estimated and to some extent overcome.

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