Improvements of the CMFD acceleration capability of OpenMOC

Wenbin Wu; Guillaume Giudicelli; Kord Smith; Benoit Forget; Dong Yao; Yingrui Yu; Qi Luo

doi:https://doi.org/10.1016/j.net.2020.04.001

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자료유형: 학술저널

저자정보: Wenbin Wu (Department of Nuclear Science and Engineering, Massachusetts Institute of Technology) Guillaume Giudicelli (Department of Nuclear Science and Engineering, Massachusetts Institute of Technology) Kord Smith (Department of Nuclear Science and Engineering, Massachusetts Institute of Technology) Benoit Forget (Department of Nuclear Science and Engineering, Massachusetts Institute of Technology) Dong Yao (b Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of) Yingrui Yu (b Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of) Qi Luo (b Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제52권 제10호

발행연도: 2020.10

수록면: 2,162 - 2,172 (11page)

DOI: https://doi.org/10.1016/j.net.2020.04.001

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Due to its computational efficiency and geometrical flexibility, the Method of Characteristics (MOC) has been widely used for light water reactor lattice physics analysis. Usually acceleration methods are necessary for MOC to achieve acceptable convergence on practical reactor physics problems. Among them, Coarse Mesh Finite Difference (CMFD) is very popular and can drastically reduce the number of transport iterations. In OpenMOC, CMFD acceleration was implemented but had the limitation of supporting only a uniform CMFD mesh, which would often lead to splitting MOC source regions, thus creating an unnecessary increase in computation and memory use. In this study, CMFD acceleration with a non-uniform Cartesian mesh is implemented into OpenMOC. We also propose a quadratic fit based CMFD prolongation method in the axial direction to further improve the acceleration when multiple MOC source regions are contained in one CMFD coarse mesh. Numerical results are presented to demonstrate the improvement of the CMFD acceleration capability in OpenMOC in terms of both efficiency and stability.

#OpenMOC #Method of characteristics #Coarse mesh finite difference #Non-uniform coarse mesh #Quadratic fit prolongation

참고문헌 (19)

참고문헌 신청

J. Askew / 1972 / A Characteristics Formulation of the Neutron Transport Equation in Complicated Geometries

K. Smith / 2002 / Full-core, 2-D, LWR Core Calculations with CASMO-4E / PHYSOR 2002

W. Boyd / 2014 / The OpenMOC method of characteristics neutral particle transport code / Ann. Nucl. Energy 68:43~52

G. Gunow / 2017 / Accuracy and performance of 3D MOC for fullcore PWR problems / M&C 2017 - International Conference on Mathematics & Computational Methods Applied to Nuclear Science & Engineering

K. Smith / 1983 / Nodal method storage reduction by nonlinear iteration / Trans. Am. Nucl. Soc 44:265

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