Gotpm: a parallel hybrid particle-mesh treecode
Apr, 2003
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Abstract: (arXiv)
We describe a parallel, cosmological N-body code based on a hybrid scheme using the particle-mesh (PM) and Barnes-Hut (BH) oct-tree algorithm. We call the algorithm GOTPM for Grid-of-Oct-Trees-Particle-Mesh. The code is parallelized using the Message Passing Interface (MPI) library and is optimized to run on Beowulf clusters as well as symmetric multi-processors. The gravitational potential is determined on a mesh using a standard PM method with particle forces determined through interpolation. The softened PM force is corrected for short range interactions using a grid of localized BH trees throughout the entire simulation volume in a completely analogous way to PM methods. This method makes no assumptions about the local density for short range force corrections and so is consistent with the results of the PM method in the limit that the treecode opening angle parameter, . (abridged)- METHODS N-BODY SIMULATIONS
- METHODS NUMERICAL
- COSMOLOGY
- DARK MATTER
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