4.7 Article

Accelerating NBODY6 with a graphics processing unit-enabled Particle-Particle Particle-Tree scheme

期刊

出版社

OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab3090

关键词

globular clusters: general; gravitation; methods: numerical; software: simulations

资金

  1. National Collaborative Research Infrastructure Strategy (NCRIS) Astronomy allocation by Australian Government
  2. JSPS International Research Fellow (School of Science, The University of Tokyo)

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The modified version of the NBODY6 code improves computational efficiency for simulating star clusters with little sacrifice in accuracy. It outperforms NBODY6 for systems with more than 3 x 10(5) particles and runs more than a factor 2 faster for systems of 10(6) particles with similar energy conservation. This code is useful for simulating realistic dense stellar clusters like globular clusters or galactic nuclei.
We describe a modified version of the NBODY6 code for simulating star clusters which greatly improves computational efficiency while sacrificing little in the way of accuracy. The distant force calculator is replaced by a graphics processing unit-enabled Barnes-Hut code, and integration is done with a standard leap frog scheme. Short-range forces continue to use the CPU-based fourth-order Hermite predictor-corrector scheme of NBODY6. Our code outperforms NBODY6 for systems with more than 3 x 10(5) particles and runs more than a factor 2 faster for systems of 10(6) particles with similar energy conservation. Our code should be useful for simulating realistic dense stellar clusters, such as globular clusters or galactic nuclei.

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