Treffer: Numerical Model for Simulations of Taffy Galaxies.

A parallel computational model of the dynamics of multi-component (gas+stars+dark matter) colliding galaxies is developed using CUDA technology for hybrid supercomputers with graphics processors (CPU+GPU). The numerical model includes Smooth Particle Hydrodynamics, N-body dynamics, direct algorithm for calculating gravitational forces (Particle–Particle Method), gas heating/cooling processes, star formation and stellar feedback to describe mutual transformations of gas into stars and back. Our parallel CUDA algorithm "SPH N-body" is tested in solving the astrophysical problem of modeling collisions of gas-rich spiral galaxies using the example of Taffy systems. The results of numerical simulations explain some of the observed structures in Taffy galaxies. An analysis of the computational efficiency of our parallel code allowed us to identify the most resource-intensive modules associated with the calculation of gas-dynamic forces in the SPH method when studying head-on galactic collisions with intense energy release and gas clustering in the form of cold molecular clouds. [ABSTRACT FROM AUTHOR]

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