Hydrogen-helium chemical and nuclear galaxy collision: Hydrodynamic simulations on AVX-512 supercomputers

摘要

A computational hydrodynamic model of interacting galaxies is presented. The interstellar medium (ISM) is described by a model of gravitational multicomponent single-velocity hydrodynamics. A model based on first moments of the collisionless Boltzmann equation is used to describe the stellar component and dark matter. Subgrid processes of star formation and supernovae feedback, as well as cooling and heating functions are added to the hydrodynamic model. The computational model includes chemical and nuclear reactions of the basic forms of hydrogen and helium before the formation of the helium hydride ion. The hydrodynamic equations have a suitable form for solving by a unified computational method based on the "Harten - Lax - van Leer"(HLL) method. The equations and the numerical method are written in vector form to use advanced vector extensions AVX-512 to speed up the calculations. A parallel implementation of the model and some computational simulation experiments on the chemical dynamics of interacting galaxies are presented. (c) 2021 Elsevier B.V. All rights reserved.