Discrete ordinates method-like transport computation with equivalent group condensation and angle-collapsing for local/global iteration

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The group condensation of the transport equation is studied in this paper so that the computational burden can be reduced. The group condensation procedure leads to equivalent total cross section that becomes angle dependent. The difficulty of angle dependency has been traditionally treated by consistent P or extended transport approximation in multigroup transport computation. However, in this study, the angle dependency of the total cross section is applied directly to the discrete ordinates equation, and the solution procedure is validated numerically on a test problem. In addition, an angle-collapsing concept is proposed for the purpose of further simplifying the group condensed problem. A local/global iteration framework is also described, in which fine-group discrete ordinates calculation is used in local problems while few-group angle collapsed transport calculation is used in the global problem, with excellent test results in the k(eff) and flux estimation. (C) 2010 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2011-04
Language
English
Article Type
Article
Citation

ANNALS OF NUCLEAR ENERGY, v.38, no.4, pp.846 - 852

ISSN
0306-4549
DOI
10.1016/j.anucene.2010.11.012
URI
http://hdl.handle.net/10203/95209
Appears in Collection
NE-Journal Papers(저널논문)
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