Parallel particle simulations of low-density fluid flows
Direct Simulation Monte Carlo (DSMC) is a simulation technique that uses particles to model fluids at low densities where continuum formulations break down. Monte Carlo rules are used to perform particle collisions and chemical reactions and a grid is used to locate nearby particles. We describe our implementation of a large-scale DSMC model on the thousand-processor nCUBE 2 and Intel Paragon machines. It includes body-fitted irregular grids and particle weighting to reduce the numbers of particles and grid cells that must be used. Our parallel methods for load-balancing and performing irregular communication on the distributed-memory machines are also discussed. The parallel machines have enabled us to run large simulations (10{sup 7} particles, 10{sup 4} grid cells, 10{sup 4} timesteps) at speeds up to 40 times faster (on our nCUBE 2) than on a Cray Y-MP processor. For illustration purposes, we include results from some of these large-scale simulations.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 10131889
- Report Number(s):
- SAND-93-2556C; CONF-940428-2; ON: DE94007858; BR: GB0103012
- Resource Relation:
- Conference: High performance computing `94: grand challenges in computer simulation,La Jolla, CA (United States),11-15 Apr 1994; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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