Performance and optimization of direct implicit particle simulation
Performance characteristics obtained from particle simulations using the direct implicit method are presented. Parameter studies of simulation behavior for an expanding plasma slab have been made determining code performance as functions of ..omega../sub p//sub e/..delta..t and ..delta..x/lambda/sub D//sub e/, where ..omega../sub p//sub e/ is the plasma frequency, lambda/sub D//sub e/ is the electron Debye length, ..delta..t is the time step, and ..delta..x is the grid spacing. A range of time steps ..omega../sub p//sub e/..delta..tless than or equal to200 and mesh sizes ..delta..x/lambda/sub D//sub e/less than or equal to100 were explored. Accurate results for low-frequency phenomena resolved by the time step can be obtained without limit on ..omega../sub p//sub e/..delta..t in this range (and higher) with a careful choice of algorithms. This choice of algorithms defeats a potential nonlinear instability that occurs when (..omega../sub p//sub e/..delta..t)/sup 2/ exceeds the number of particles per cell. copyright 1989 Academic Press, Inc.
- Research Organization:
- Lawrence Livermore National Laboratory, University of California, Livermore, California 94550
- OSTI ID:
- 6447291
- Journal Information:
- J. Comput. Phys.; (United States), Journal Name: J. Comput. Phys.; (United States) Vol. 81:1; ISSN JCTPA
- Country of Publication:
- United States
- Language:
- English
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