Hydrogen-helium chemical and nuclear galaxy collision: hydrodynamic simulations on AVX-512 supercomputers. (English) Zbl 1467.65081

The authors study a computational hydrodynamic model of interacting galaxies. A model of gravitational multicomponent single-velocity hydrodynamics is employed to describe the interstellar medium. Further, a model based on the first moments of the collisionless Boltzmann equation describes the stellar component and dark matter. Subgrid processes of star formation and supernovae feedback, as well as cooling and heating functions are included in the model. The computational model takes into consideration, the 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 method. The governing equations and the computational scheme are written in vector form to use advanced vector extensions AVX-512. A parallel implementation of the model is presented. Results on the computational simulation experiments on the chemical dynamics of interacting galaxies are reported.


65M06 Finite difference methods for initial value and initial-boundary value problems involving PDEs
65Y05 Parallel numerical computation
85-08 Computational methods for problems pertaining to astronomy and astrophysics
85A05 Galactic and stellar dynamics
85A30 Hydrodynamic and hydromagnetic problems in astronomy and astrophysics
76V05 Reaction effects in flows
76L05 Shock waves and blast waves in fluid mechanics
76U99 Rotating fluids
76X05 Ionized gas flow in electromagnetic fields; plasmic flow
80A19 Diffusive and convective heat and mass transfer, heat flow
80A21 Radiative heat transfer
81V35 Nuclear physics
83C57 Black holes
35Q20 Boltzmann equations
35Q85 PDEs in connection with astronomy and astrophysics
Full Text: DOI


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