The NILO-CMFD Method for Iteratively Solving Coupled Neutron Transport?Thermal Hydraulics Problems
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Date
2023
Publication Type
Journal Article
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no
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Abstract
The coarse-mesh finite difference (CMFD) method is commonly used to accelerate the iterative convergence of single-physics neutron transport problems. For multiphysics problems, the neutron cross sections depend on the temperature and density, both of which depend on the fission heat source; the resulting nonlinear feedback can significantly degrade the performance of CMFD and even cause instability. In this paper, we propose, for a class of one-dimensional (1-D) model multiphysics problems, a new nonlinearly implicit low-order (NILO) CMFD (NILO-CMFD) acceleration method to improve the performance of CMFD-based methods for solving loosely coupled multiphysics problems. Our numerical testing and Fourier analysis show that for the 1-D model problems, the new NILO-CMFD method achieves the same rapid convergence rate that CMFD achieves for single-physics problems.
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published
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Journal / series
Volume
197 (2)
Pages / Article No.
262 - 278
Publisher
Taylor & Francis
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Subject
Neutron transport; thermal hydraulics; multiphysics; acceleration methods
Organisational unit
09733 - Manera, Annalisa / Manera, Annalisa