N-Body Galaxy Dynamics Simulations on a Homogeneous Beowulf Cluster

Details N-Body Galaxy Dynamics Simulations on a Homogeneous Beowulf Cluster N-Body Galaxy Dynamics Simulations on a Homogeneous Beowulf Cluster

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20517702g&link_type=abstract

American Astronomical Society Meeting 205, #177.02; Bulletin of the American Astronomical Society, Vol. 37, p.381

Astronomy and Astrophysics

Astrophysics

Scientific paper

The galactic distribution of dark matter in disk galaxies remains an important problem in astrophysics. Modern methods in determining this distribution rely heavily on N--Body simulations. To this end we have developed a variable time step Piet Hut N--Body simulator, run using MPICH on a homogeneous 12 processor (x86) Beowulf cluster.
The Hut Algorithm allows for the efficient, accurate calculation of forces between millions of points in a reasonable time. Additionally, subdividing the space into octants allows for the efficient creation O(N log (N)) of mutual nearest-neighbor data for all points. Such data are necessary for the inclusion of smoothed particle hydrodynamics (gas clouds, etc) as well as for merging the frequent, tightly bound, rapidly rotating, binary systems that decrease performance in this type of simulation.
Initial tests have shown strong agreement with exhaustive O(N2) calculation results. Simulating 10,000 points yielded a total relative error of 0.32% with the exhaustive case, executing in 3.3 seconds on the cluster. General system-level tests have also been performed, including determining collapse times for cold and isothermal spherical distributions; all resulting in good agreement with analytical results. Tests on the Kuz'min galactic distribution have also resulted in expected rotational rates. We discuss the oscillatory behavior of such distributions within several constant potentials with the intention of further eliciting the distribution of dark matter within our own galaxy.

Affiliated with

Also associated with

No associations

Rating

N-Body Galaxy Dynamics Simulations on a Homogeneous Beowulf Cluster does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with N-Body Galaxy Dynamics Simulations on a Homogeneous Beowulf Cluster, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and N-Body Galaxy Dynamics Simulations on a Homogeneous Beowulf Cluster will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1645962