OLIVA, AMAURY M.ALVES FILHO, HERMESBARROS, RICARDO C.CURBELO, JESUS P.2020-02-202020-02-20OLIVA, AMAURY M.; ALVES FILHO, HERMES; BARROS, RICARDO C.; CURBELO, JESUS P. The spectral deterministic method applied to nêutron fixed-source discrete ordinates problems in X, Y-geometry for multigroup calculations. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 21-25, 2019, Santos, SP. <b>Proceedings...</b> Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2019. p. 4702-4716. Disponível em: http://repositorio.ipen.br/handle/123456789/30811.http://repositorio.ipen.br/handle/123456789/30811A new approach for the development of a coarse-mesh numerical spectral nodal method is presented in this paper. This method, referred to as the Spectral Deterministic Method { Constant Nodal (SDM{CN), is based on a spectral analysis of the multigroup X,Y-Geometry, linearly anisotropic scattering neutron transport equations in discrete ordinates ( SN)formulation for xed-source calculations in non-multiplying media. In this paper we present typical model problems to illustrate the accuracy and the e ciency for coarse-mesh energy multigroup SN calculations of the SDM-CN method. The numerical results obtained are compared with the traditional ne-mesh Diamond Di erence (DD) method and the results obtained by DOT{II and TWOTRAN codes. The numerical results are also compared with the spectral nodal method, spectral Green's function (SGF).4702-4716openAccessboltzmann equationcomparative evaluationscomparative evaluationscomputerized simulationd codesdiscrete ordinate methodfinite difference methodmultigroup theoryneutron transportnodal expansion methodscatteringt codesTexto completo de evento