Angular parallelization of a curvilinear S sub n transport theory method
Journal Article
·
· Nuclear Science and Engineering; (United States)
OSTI ID:5768909
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Nuclear Engineering
In this paper a parallel algorithm for angular domain decomposition (or parallelization) of an r-dependent spherical S{sub n} transport theory method is derived. The parallel formulation is incorporated into TWOTRAN-II using the IBM Parallel Fortran compiler and implemented on an IBM 3090/400 (with four processors). The behavior of the parallel algorithm for different physical problems is studied, and it is concluded that the parallel algorithm behaves differently in the presence of a fission source as opposed to the absence of a fission source; this is attributed to the relative contributions of the source and the angular redistribution terms in the S{sub s} algorithm. Further, the parallel performance of the algorithm is measured for various problem sizes and different combinations of angular subdomains or processors. Poor parallel efficiencies between {approximately}35 and 50% are achieved in situations where the relative difference of parallel to serial iterations is {approximately}50%. High parallel efficiencies between {approximately}60% and 90% are obtained in situations where the relative difference of parallel to serial iterations is {lt}35%.
- OSTI ID:
- 5768909
- Journal Information:
- Nuclear Science and Engineering; (United States), Journal Name: Nuclear Science and Engineering; (United States) Vol. 108:3; ISSN 0029-5639; ISSN NSENA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
22 GENERAL STUDIES OF NUCLEAR REACTORS
220100* -- Nuclear Reactor Technology-- Theory & Calculation
663470 -- Fission-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALGORITHMS
COMPUTER CALCULATIONS
FISSIONABLE MATERIALS
FORTRAN
KINETICS
MATERIALS
MATHEMATICAL LOGIC
NEUTRON TRANSPORT THEORY
NUCLEAR REACTIONS
PARALLEL PROCESSING
PROGRAMMING
PROGRAMMING LANGUAGES
REACTOR KINETICS
SPHERICAL HARMONICS METHOD
TECHNOLOGY UTILIZATION
TRANSPORT THEORY
220100* -- Nuclear Reactor Technology-- Theory & Calculation
663470 -- Fission-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALGORITHMS
COMPUTER CALCULATIONS
FISSIONABLE MATERIALS
FORTRAN
KINETICS
MATERIALS
MATHEMATICAL LOGIC
NEUTRON TRANSPORT THEORY
NUCLEAR REACTIONS
PARALLEL PROCESSING
PROGRAMMING
PROGRAMMING LANGUAGES
REACTOR KINETICS
SPHERICAL HARMONICS METHOD
TECHNOLOGY UTILIZATION
TRANSPORT THEORY