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The spectral deterministic method applied to n??utron fixed-source discrete ordinates problems in X, Y-geometry for multigroup calculations
Autor
OLIVA, AMAURY M.
ALVES FILHO, HERMES
BARROS, RICARDO C.
CURBELO, JESUS P.
INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE
Resumen
A 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).