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Title:
On a Hermite integrator with Ahmad-Cohen scheme for gravitational many-body problems
Authors:
Makino, Junichiro; Aarseth, Sverre J.
Affiliation:
AA(Tokyo, University, Japan), AB(Cambridge University Institute of Astronomy, England)
Publication:
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 2, 1992, p. 141-151. (PASJ Homepage)
Publication Date:
04/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
COMPUTATIONAL ASTROPHYSICS, GRAVITATIONAL EFFECTS, MANY BODY PROBLEM, NUMERICAL INTEGRATION, ACCURACY, COMPUTER PROGRAMS, PARALLEL COMPUTERS
Bibliographic Code:
1992PASJ...44..141M

Abstract

HACS, a fourth-order Hermite integrator with the Ahmad-Cohen scheme is implemented. HACS is self-starting, so its implementation is considerably simpler than the original ACS. Compared to ACS, HACS allows time steps twice as long for the same accuracy and the increase in calculation cost per timestep is not very large. The actual gain in speed depends on the hardware and ranges between a factor of one and two. The gain using ACS would be significantly smaller on vector or parallel machines.

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