NBODY2: A direct N-body integration code

We give a full description of the code NBODY2 for direct integration of the gravitational N-body problem. The method of solution is based on the neighbour scheme of Ahmad and Cohen [J. Comput. Phys. 12 (1973) 389] which speeds up the force calculation already for quite modest particle numbers. Deriv...

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Bibliographic Details
Published in:New astronomy 2001, Vol.6 (5), p.277-291
Main Author: Aarseth, Sverre J.
Format: Article
Language:English
Subjects:
Methods: N-body simulations
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Summary:We give a full description of the code NBODY2 for direct integration of the gravitational N-body problem. The method of solution is based on the neighbour scheme of Ahmad and Cohen [J. Comput. Phys. 12 (1973) 389] which speeds up the force calculation already for quite modest particle numbers. Derivations of all the relevant mathematical expressions are given, together with a detailed discussion of the algorithms. The code may be used to study a wide variety of self-consistent problems based on a small softening of the interaction potential.
ISSN:1384-1076
1384-1092
DOI:10.1016/S1384-1076(01)00060-4