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Lee, Deokjung
Computational Reactor physics & Experiment lab (CORE Lab)
Research Interests
  • Reactor Analysis computer codes development
  • Methodology development of reactor physics
  • Nuclear reactor design(SM-SFR,PWR and MSR)

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Iterative two- and one-dimensional methods for three-dimensional neutron diffusion calculations

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Title
Iterative two- and one-dimensional methods for three-dimensional neutron diffusion calculations
Author
Lee, DeokjungLee, H.C.Downar, T.J
Issue Date
2005-09
Publisher
AMER NUCLEAR SOCIETY
Citation
NUCLEAR SCIENCE AND ENGINEERING, v.151, no.1, pp.46 - 54
Abstract
Two methods are proposed for solving the three-dimensional neutron diffusion equation by iterating between solutions of the two-dimensional (2-D) radial and one-dimensional (1-D) axial solutions. In the first method, the 2-D/1-D equations are coupled using a current correction factor (CCF) with the average fluxes of the lower and upper planes and the axial net currents at the plane interfaces. In the second method, an analytic expression for the axial net currents at the interface of the planes is used for planar coupling. A comparison of the new methods is made with two previously proposed methods, which use interface net currents and partial currents for planar coupling. A Fourier convergence analysis of the four methods was performed, and results indicate that the two new methods have at least three advantages over the previous methods. First, the new methods are unconditionally stable, whereas the net current method diverges for small axial mesh size. Second, the new methods provide better convergence performance than the other methods in the range of practical mesh sizes. Third, the spectral radii of the new methods asymptotically approach zero as the mesh size increases, while the spectral radius of the partial current method approaches a nonzero value as the mesh size increases. Of the two new methods proposed here, the analytic method provides a smaller spectral radius than the CCF method, but the CCF method has several advantages over the analytic method in practical applications.
URI
https://scholarworks.unist.ac.kr/handle/201301/7401
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=24744467609
ISSN
0029-5639
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