A new hierachical particle-mesh code for very large scale cosmological N-body simulations
- Ohio State Univ., Columbus (USA) California Institute of Technology, Pasadena (USA)
An improved three-dimensional hierarchical particle-mesh (HPM) N-body code for the gravitational evolution of structure in the universe has been developed and tested. The basis of the code is a standard particle-mesh (PM) code where Poisson's equation is solved on a critical grid with fast Fourier transform techniques and periodic boundary conditions. Several subgrids and father grids can fit into a cube. The fields from the father grid, and its father grid, and so on, are treated as external fields. There is no back-reaction to father grids, and particles can enter and exit subgrids. In a four grid code the dynamic range can be extended to 6000 in length and 11 orders of magnitude in mass. The initial conditions are generated with a random phase realization of the power spectrum of the growing mode using the Zel'dovich approximation (1970). The HPM code is much faster than tree codes and particle-particle-mesh codes, and has a much larger dynamic range. 28 refs.
- OSTI ID:
- 7242213
- Journal Information:
- Astrophysical Journal, Supplement Series; (USA), Vol. 71; ISSN 0067-0049
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
COSMOLOGY
COMPUTER CODES
UNIVERSE
MASS DISTRIBUTION
ASTROPHYSICS
EQUATIONS OF MOTION
FOURIER TRANSFORMATION
GRAVITATION
HUBBLE EFFECT
MANY-BODY PROBLEM
MESH GENERATION
MORPHOLOGY
POISSON EQUATION
DIFFERENTIAL EQUATIONS
DISTRIBUTION
EQUATIONS
INTEGRAL TRANSFORMATIONS
PARTIAL DIFFERENTIAL EQUATIONS
SPATIAL DISTRIBUTION
TRANSFORMATIONS
640106* - Astrophysics & Cosmology- Cosmology
990200 - Mathematics & Computers