Contents: NBODY4 is a sophisticated N-body code developed by Dr. Sverre Aarseth to run with GRAPE-6 and GRAPE-6a hardware. It is a Hermite individual time step code with two-body (KS) regularization and many other features. NBODY4 is described in Aarseth's book Gravitational N-body Simulations Tools and Algorithms, on his software downloads page and in his publications. The NBODY4 code used in NBodyLab was downloaded in February 2006, and further revisions were made in cooperation with Aarseth. NBODY4 is updated occasionally; see the links above for the latest version and other well-known codes such as NBODY6. On a personal workstation, NBODY4 is run via a command line interface and runs may last days or weeks for scientific research. Vicki Johnson adapted NBODY4 for NBodyLab so that small runs could be made via a web interface, enabling users who do not have GRAPE-6a hardware to experiment with NBODY4's performance and capabilities. Vicki does not have the expertise to fully validate her adaptation for NBodyLab, so please email Vicki if you would like to see improvements or have questions about the web interface.
The
NBODY4 code is driven by a single input parameter file with many
interesting options.
Aarseth has prepared an
introduction
to help you run and understand the
output from NBODY4 simulations.
Please print these for reference and carefully check your edits of
the input file. Also helpful is Aarseth's
book and the NBODY6 user manual, available at the software
downloads page.
For beginners:
Examples using concise input mode:
Run the NBodyLab
adaptation of NBODY4:
See timing comparisons of NBODY4 with GRAPE acceleration versus
NBODY6 without GRAPE acceleration.
To sign up for news, get help or request permission for longer simulations,
write to nbodylab@interconnect.com.
|
