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Flux Region Assignment Method Using Ray Trace Information for the Method of Characteristics to Improve Cache Efficiency

Akio Yamamoto, Akinori Giho, Tomohiro Endo

Nuclear Science and Engineering / Volume 192 / Number 3 / December 2018 / Pages 240-253

Technical Paper / dx.doi.org/10.1080/00295639.2018.1501978

Received:May 28, 2018
Accepted:July 14, 2018
Published:November 29, 2018

A flux region assignment algorithm to increase cache efficiency for the method of characteristics (MOC) is proposed. In order to minimize the stride of memory access, flux region identifications are assigned based on the ray trace sequence during the MOC calculation. The present method is implemented in the three-dimensional transport code GENESIS and its performance is confirmed through verification calculations ranging from single pressurized water reactor (PWR) fuel assembly to PWR full-core benchmark problems. Quantitative comparison of cache efficiency is carried out and the present method shows improved cache efficiency, which results in a reduction in computation time. The present method can reduce computational time by improving cache efficiency while suppressing memory requirement.