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Kuroishi, Takeshi; Nomura, Yasushi
Proceedings of International Conference on the New Frontiers of Nuclear Technology; Reactor Physics, Safety and High-Performance Computing (PHYSOR 2002) (CD-ROM), 10 Pages, 2002/10
To accelerate the slow convergence of the fission source distribution, the matrix k calculation has been developed and incorporated in the ordinary Monte Carlo method. The acceleration can be performed by the fission source correction using the eigenvector of the fission matrix, if the coupling coefficients are approximately evaluated in the middle of Monte Carlo calculation. In this paper, we propose two effective applications of the matrix k, that is, the acceleration repetition method and the source generation method. The former simply repeats the matrix k calculation, and the result for the irradiated fuel pin cell shows enough effective to accelerate the fission source on the criticality estimation. However, in some cases of the loosely coupled multi unit system, the repetition of matrix k more than twice could not be carried out to get into convergence because of many units of low source level. The latter is newly devised here to apply to such cases. The checkerboard fuel storage rack is one of the typical cases, and the calculated results show the effectiveness of this method.
Guo, Z.; Hirayama, Toshio; Matsuzawa, Teruo*; Watanabe, Masahiro*
Keisan Kogaku Koenkai Rombunshu, 7(1), p.173 - 176, 2002/05
no abstracts in English
Guo, Z.; Hirayama, Toshio; Matsuzawa, Teruo*
Application of High-Performance Computing in Engineering VII, p.125 - 134, 2002/00
The objective of the presented study is to develop a LC (Loose Coupling) simulation system implementing two commercial numerical simulation software packages linked by a library called MpCCI (Mesh-based paralle Code Coupling Interface). This library is an essential and a robust tool for carrying out interpolations of the physical variables (values) between different numerical models. We have programmed the MpCCI library into two commercial codes, Mecano and Star-CD, and implemented the developed LC simulation system on a distributed parallel computer by a MPMD (Multi Program Multi Data) parallel programming style. Numerical simulation results of an aneurysm diseased artery acquired by dynamic CSD (Computational Structure Dynamics) coupled transient CFD (Computational Fluid Dynamics) undergoing pulsation blood flow with the LC simulation system is presented which illustrate the mechanical behaviors of the arterial wall.
Onishi, Ryoichi*; Guo, Z.*; Kimura, Toshiya*; Iwamiya, Toshiyuki*
Proceedings of 4th International Conference on Supercomputing in Nuclear Applications (SNA 2000) (CD-ROM), 12 Pages, 2000/09
no abstracts in English