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Journal Articles

Nodal arrangements for boundary treatment in EFGM

Tian, R.; Nakajima, Norihiro; Yagawa, Genki

Keisan Kogaku Koenkai Rombunshu, 10(1), p.397 - 400, 2005/05

An attempt is made to treat boundary conditions in EFGM through only nodal arrangements. One of major merits of the proposed nodal arrangement scheme is its straightforwardness in implementation. The accuracy of this nodal arrangement boundary treatment and its influence on convergence are assessed by comparing with the Lagrange multiplier and penalty methods using one- and two- dimensional problems. The nodal arrangement scheme shows a same performance as the Lagrange multiplier and penalty methods in the one-dimensional tests, but it evidently outperforms the penalty method in the two-dimensional tests.

Journal Articles

Introduction to modern nodal method and discontinuity factor

Okumura, Keisuke

Nihon Genshiryoku Gakkai Dai-36-Kai Robutsuri Kaki Semina Tekisuto, p.81 - 102, 2004/08

The modern node method which uses a discontinuous factor has come to be widely used recently in the reactor core analyses of commercial light water reactors. The basic theory, numerical computation technique and examples of calculation results are explained for biginners of the modern nodal method.

JAEA Reports

Analysis of the applicability of acceleration methods for a triangular prism geometry nodal diffusion code

Fujimura, Toichiro*; Okumura, Keisuke

JAERI-Research 2002-024, 27 Pages, 2002/11

JAERI-Research-2002-024.pdf:1.04MB

A prototype version of a diffusion code has been developed to analyze the hexagonal core as reduced moderation reactor and the applicability of some acceleration methods have been investigated to accelerate the convergence of the iterative solution method. The hexagonal core is divided into regular triangular prisms in the three-dimensional code MOSRA-Prism and a polynomial expansion nodal method is applied to approximate the neutron flux distribution by a cubic polynomial. The multi-group diffusion equation is solved iteratively with ordinal inner and outer iterations and the effectiveness of acceleration methods is ascertained by applying an adaptive acceleration method and a neutron source extrapolation method, respectively. The formulation of the polynomial expansion nodal method is outlined in the report and the local and global effectiveness of the acceleration methods is discussed with various sample calculations. A new general expression of vacuum boundary condition, derived in the formulation is also described.

JAEA Reports

MOSRA-Light; High speed three-dimensional nodal diffusion code for vector computers

Okumura, Keisuke

JAERI-Data/Code 98-025, 243 Pages, 1998/10

JAERI-Data-Code-98-025.pdf:10.15MB

no abstracts in English

Journal Articles

Forth-nodal preparative; Implementation of a forth monitor nucleus into a 16-bit PC

Kawarasaki, Yuki

Proc. of the 14th Linear Accelerator Meeting in Japan, p.342 - 344, 1989/09

no abstracts in English

Journal Articles

Forth-NODAL: Concept and preliminary

Kawarasaki, Yuki; Sugimoto, Masayoshi

Proceedings of the 7th Symposium on Accelerator Science and Technology, p.262 - 263, 1989/00

no abstracts in English

JAEA Reports

A Proposal of Steam Table Including Metastable States

; ; Hirano, Masashi; *

JAERI-M 83-116, 51 Pages, 1983/07

JAERI-M-83-116.pdf:1.08MB

no abstracts in English

Journal Articles

Study of textures of the $$gamma$$-ray-induced polyethylene by ozone degradation

; *; ; Kuriyama, Isamu

Reports on Progress in Polymer Physics in Japan, 17, p.265 - 268, 1974/00

no abstracts in English

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