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Title: PENTRAN: A three-dimensional scalable transport code with complete phase-space decomposition

Three-dimensional S{sub N} transport modeling is gaining importance, with a rising need for detailed fluence calculations in geometries with inherent asymmetries. These calculations often cannot be adequately performed due to immense memory and storage requirements. New scalable, parallel discrete ordinates codes that take advantage of distributed memory parallel architectures are required. In general, scalable parallel algorithms minimize serial operations, maximize algorithm and data parallelism, and maximize computation to communication ratio. A leading issue in scalability is the minimization of serial input/output (I/O) in parallel algorithms. All I/O tasks should be handled efficiently by each individual processor. Further, memory-intensive arrays should be partitioned locally, distributed among processors. Regardless of parallel speedup, use of a local, partitioned memory structure is the only way that larger problems can be solved at all. In addition to using local memory allocation, efficient interprocess communicator groups for specific sets of processors should be used, allowing as needed message passing between necessary groups of processors, avoiding wasteful communications. Acceleration methods are needed because, without them, convergence can be difficult in some problems. Complete parallel decomposition of the problem should also be available; recent analysis of the transport source iteration indicates that significant parallel speedups are possible withmore » various decomposition strategies of the phase-space (angle, energy, and spatial dimensions) over a large processor array.« less
Authors:
;  [1]
  1. Pennsylvania State Univ., University Park, PA (United States)
Publication Date:
OSTI Identifier:
436906
Report Number(s):
CONF-9606116--
Journal ID: TANSAO; ISSN 0003-018X; TRN: 96:005275-0138
Resource Type:
Journal Article
Resource Relation:
Journal Name: Transactions of the American Nuclear Society; Journal Volume: 74; Conference: Annual meeting of the American Nuclear Society (ANS), Reno, NV (United States), 16-20 Jun 1996; Other Information: PBD: 1996
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; 99 MATHEMATICS, COMPUTERS, INFORMATION SCIENCE, MANAGEMENT, LAW, MISCELLANEOUS; NEUTRON TRANSPORT; P CODES; ALGORITHMS; CONVERGENCE; DISCRETE ORDINATE METHOD; PARALLEL PROCESSING