Study of the interaction of regions with multi-group and continuous energy representation in Monte Carlo calculations

Mikolaj Adam Kowalski, Eugene Shwageraus

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

It is well known that multi-group (MG) Monte Carlo (MC) calculations can run significantly faster than continuous energy (CE). Often high fidelity results are not required everywhere in the problem. This paper investigates an approach to accelerating MC calculation by combining MG and CE representations in a single MC calculation. An interface condition, based on slowing down calculation in an infinite lattice was developed to correct for resonance shielding while transitioning particles from regions with MG treatment to those with CE treatment. Moreover it was shown, that it is necessary to apply a different source normalisation in the CE and MG region to achieve reasonable accuracy of results. Prototype 1D implementation of the scheme was tested on small UOX and MOX problems. The error in fission rate distribution in CE region of combined MG-CE calculation was reduced to below 0.3% from up to 2% in a purely MG calculation. Prototype implementation was about 10% slower than theoretical maximum, obtained as a mixture of run-times of purely MG and CE problem, weighted by fraction of MG and CE tracking.

Original languageEnglish
Title of host publicationInternational Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2019
PublisherAmerican Nuclear Society
Pages1348-1357
Number of pages10
ISBN (Electronic)9780894487699
StatePublished - 1 Jan 2019
Externally publishedYes
Event2019 International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2019 - Portland, United States
Duration: 25 Aug 201929 Aug 2019

Publication series

NameInternational Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2019

Conference

Conference2019 International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering, M and C 2019
Country/TerritoryUnited States
CityPortland
Period25/08/1929/08/19

Keywords

  • Hybrid methods
  • Monte Carlo
  • Multi-group Monte Carlo
  • Variable fidelity

Fingerprint

Dive into the research topics of 'Study of the interaction of regions with multi-group and continuous energy representation in Monte Carlo calculations'. Together they form a unique fingerprint.

Cite this