Solution for the Multigroup Neutron Space Kinetics Equations by Source Iterative Method

Autores

  • Matheus Gularte Tavares Universidade Federal de Pelotas image/svg+xml
  • Claudio Zen Petersen
  • Marcelo Schramm
  • Rodrigo Zanette

DOI:

https://doi.org/10.15392/bjrs.v9i2A.731

Palavras-chave:

Neutron Diffusion Equation, Source Iterative Method, Laplace Transform, Stehfest Algorithm, Polinomial Interpola-tion.

Resumo

In this work, we used a modified Picard’s method to solve the Multigroup Neutron Space Kinetics Equations (MNSKE) in Cartesian geometry. The method consists in assuming an initial guess for the neutron flux and using it to calculate a fictitious source term in the MNSKE. A new source term is calculated applying its solution, and so on, iteratively, until a stop criterion is satisfied. For the solution of the fast and thermal neutron fluxes equations, the Laplace Transform technique is used in time variable resulting in a first order linear differential matrix equation, which are solved by classical methods in the literature. After each iteration, the scalar neutron flux and the delayed neutron precursors are reconstructed by polynomial interpolation. We obtain the fluxes and precursors through Numerical Inverse Laplace Transform by Stehfest method. We present numerical simulations and comparisons with available results in literature.

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Referências

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Publicado

24-07-2021

Edição

Seção

XX Meeting on Nuclear Reactor Physics and Thermal Hydraulics (XX ENFIR)

Como Citar

Solution for the Multigroup Neutron Space Kinetics Equations by Source Iterative Method. Brazilian Journal of Radiation Sciences, Rio de Janeiro, Brazil, v. 9, n. 2A (Suppl.), 2021. DOI: 10.15392/bjrs.v9i2A.731. Disponível em: https://bjrs.org.br/revista/index.php/REVISTA/article/view/731. Acesso em: 17 jul. 2025.