HARP: A Special-Purpose Computer forN-Body Problem

Details HARP: A Special-Purpose Computer forN-Body Problem HARP: A Special-Purpose Computer forN-Body Problem

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45..349m&link_type=abstract

Publications of the Astronomical Society of Japan, v.45, p.349-360.

Astronomy and Astrophysics

Astronomy

29

N-Body Simulation, Numerical Methods, Special-Purpose Computer, Stellar Dynamics

Scientific paper

We present the concept of HARP (Hermite AcceleratoR Pipeline), a special-purpose computer for solving N-body problem using the Hermite integrator. A Hermite integrator uses analytically calculated derivatives of the acceleration, in addition to the acceleration, to integrate the orbit of a particle. It has a better stability and allows a longer time step than does an Adams-Bashforth-Moulton type predictor-corrector scheme of the same error order. HARP is a specialized computer for this type of Hermite scheme. Its structure is quite similar to GRAPE; the only difference is that it calculates the time derivative of the acceleration, in addition to the acceleration. We are now developing HARP-1, the first prototype machine with a peak speed of 240 Mflops. The massively parallel GRAPE-4 will be based on this HARP architecture. Its speed will be about 1 Tflops.

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