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Journal Articles

Fast vector computation of the characteristics method

Kugo, Teruhiko

Journal of Nuclear Science and Technology, 39(3), p.256 - 263, 2002/03

 Times Cited Count:3 Percentile:24.2(Nuclear Science & Technology)

Two vector computation algorithms; an odd-even sweep (OES) method and an independent sequential sweep (ISS) method, have been developed for the characteristics method to solve the neutron transport equation in a heterogeneous geometry. They realize long vector lengths without recursive operations for effective use of vector computers. Their efficiency has been investigated to a realistic fuel assembly calculation. For both methods, a vector computation is 15 times faster than a scalar computation. From a viewpoint of a comparison between the OES and ISS methods, the ISS method is superior to the OES method because the ISS method shows a faster convergence and saves a computer memory without reducing a computation speed.

JAEA Reports

Fast computation of the characteristics method on vector computers

Kugo, Teruhiko

JAERI-Research 2001-051, 39 Pages, 2001/11

JAERI-Research-2001-051.pdf:2.04MB

Fast computation of the characteristics method to solve the neutron transport equation in a heterogeneous geometry has been studied. Two vector computation algorithms; an odd-even sweep (OES) method and an independent sequential sweep (ISS) method have been developed and their efficiency to a typical fuel assembly calculation has been investigated. For both methods, a vector computation is 15 times faster than a scalar computation. From a viewpoint of comparison between the OES and ISS methods, the ISS method is superior to the OES method because the ISS method shows a faster convergence and saves a computer memory without reducing a computation speed. In the vector computation, a table-look-up method to reduce computation time of an exponential function saves only 20% of a whole computation time. Both the coarse mesh rebalance method and the Aitken acceleration method are effective as acceleration methods for the characteristics method, a combination of them saves 70-80% of outer iterations compared with a free iteration.

JAEA Reports

Vectorization of nuclear codes 89-1; PHENIX,FPGS

*; *; *; Harada, Hiro

JAERI-M 89-124, 80 Pages, 1989/09

JAERI-M-89-124.pdf:1.53MB

no abstracts in English

Journal Articles

Vectorization of the three-dimensional neutron diffusion code CITATION

Harada, Hiro;

Nihon Genshiryoku Gakkai-Shi, 27(11), p.1047 - 1055, 1985/00

 Times Cited Count:0 Percentile:0.02(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Vectorization of finite-difference method

; *

Joho Shori Gakkai Rombunshi, 24(1), p.8 - 14, 1983/00

no abstracts in English

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