Symbolic implicit Monte Carlo

Journal Article · Tue Aug 01 00:00:00 EDT 1989 · Journal of Computational Physics; (USA)

DOI:https://doi.org/10.1016/0021-9991(89)90129-0· OSTI ID:5470828

Brooks, III, E D ^[1]

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1. University of California, Lawrence Livermore National Laboratory, Livermore, California 94550 (US)

We introduce a new implicit Monte Carlo technique for solving time dependent radiation transport problems involving spontaneous emission. In the usual implicit Monte Carlo procedure an effective scattering term in dictated by the requirement of self-consistency between the transport and implicitly differenced atomic populations equations. The effective scattering term, a source of inefficiency for optically thick problems, becomes an impasse for problems with gain where its sign is negative. In our new technique the effective scattering term does not occur and the excecution time for the Monte Carlo portion of the algorithm is independent of opacity. We compare the performance and accuracy of the new symbolic implicit Monte Carlo technique to the usual effective scattering technique for the time dependent description of a two-level system in slab geometry. We also examine the possibility of effectively exploiting multiprocessors on the algorithm, obtaining supercomputer performance using shared memory multiprocessors based on cheap commodity microprocessor technology. {copyright} 1989 Academic Press, Inc.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5470828
• Journal Information: Journal of Computational Physics; (USA), Journal Name: Journal of Computational Physics; (USA) Vol. 83:2; ISSN 0021-9991; ISSN JCTPA
• Country of Publication: United States
• Language: English

Related Subjects

654001* -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
ACCURACY
ALGORITHMS
EMISSION
MATHEMATICAL LOGIC
MONTE CARLO METHOD
RADIATION TRANSPORT
SLABS
TIME DEPENDENCE