Statistics – Computation
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...270..561p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 270, no. 1-2, p. 561-572.
Statistics
Computation
52
Computational Astrophysics, Galactic Structure, Three Body Problem, Astronomical Models, Galactic Evolution
Scientific paper
Computational problems related to modeling gravitational systems, and running and analyzing 3D N-body models are discussed. N-body simulations using Particle-Mesh techniques with polar grids are especially well-suited, and physically justified, when studying quiet evolutionary processes in disk galaxies. This technique allows large N, high central resolution, and is still the fastest one. Regardless of the method chosen to compute gravitation, softening is a compromise between HF amplification and resolution. Softened spherical and ellipsoidal kernels with variable resolution are set up. Detailed characteristics of the 3D polar grid, tests, code performances, and vectorization rates are also given. For integrating motion in rotating coordinates, a stable symplectic extension of the leap-frog algorithm is described. The technique used to search for periodic orbits in arbitrary N-body potentials and to determine their stability is explained.
Friedli Daniel
Pfenniger Daniel
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