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GALAXY: N-body simulation software for isolated, collisionless stellar systems

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Ada Coda
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GALAXY: N-body simulation software for isolated, collisionless stellar systems

Postby Ada Coda » Tue Apr 09, 2019 10:09 pm

GALAXY: N-body simulation software for isolated, collisionless stellar systems

Abstract: GALAXY evolves (almost) isolated, collisionless stellar systems, both disk-like and ellipsoidal. In addition to the N-body code galaxy, which offers eleven different methods to compute the gravitational accelerations, the package also includes sophisticated set-up and analysis software. While not as versatile as tree codes, for certain restricted applications the particle-mesh methods in GALAXY are 50 to 200 times faster than a widely-used tree code. After reading in data providing the initial positions, velocities, and (optionally) masses of the particles, GALAXY compute the gravitational accelerations acting on each particle and integrates forward the velocities and positions of the particles for a short time step, repeating these two steps as desired. Intermediate results can be saved, as can the final moment in a state from which the integration could be resumed. Particles can have individual masses and their motion can be integrated using a range of time steps for greater efficiency; message-passing-interface (MPI) calls are available to enable GALAXY's use on parallel machines with high efficiency.

Credit: Sellwood, J. A.

Site: http://www.physics.rutgers.edu/galaxy/
https://ui.adsabs.harvard.edu/abs/2015ApJ...804..139D

Bibcode: 2019ascl.soft04002S

ID: ascl:1904.002

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