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AbstractAbstract
[en] In order to apply the response matrix method to the multigroup-diffusion problem, the following input-output relations must be determined: boundary-boundary, boundary-volume, volume-boundary and volume-volume. These relations can be easily computed for homogenized assemblies and therefore the global problem can be solved by imposing interface continuity conditions between adjoining assemblies. However, the most interesting application of the response matrix method lies in the possibility of solving the heterogeneous assembly problem since the computation of the fine structure flux by the finite-difference method is very time consuming. This paper presents a method for the numerical computation of input-output relations through invariant imbedding techniques which essentially transform boundary value into initial value problems. The efficiency of this method is compared with that of the finite difference from the point of view of the numerical work involved. (Author)
[pt]
O metodo de Matriz Resposta aplicado ao problema multigrupo-difusao requer a determinacao de relacoes entrada-saida do tipo contorno-contorno, contorno-volume, volume-contorno e volume-volume. Tais relacoes sao facilmente calculaveis para o caso de elementos combustiveis homogeneizados e o problema global pode entao ser resolvido impondo-se condicoes de continuidade entre elementos vizinhos. O principal interesse do metodo de matriz resposta, contudo, encontra-se na possibilidade de resolver problemas com elementos combustiveis heterogeneos, quando a solucao pino a pino do problema global por diferencas finitas e muito demorada. Este trabalho apresenta tipos de relacoes entrada-saida atraves de tecnicas de 'Invariante Imbedding' que essencialmente transformam problemas de contorno em problemas de valor inicial. Um estudo numerico comparando a eficiencia do metodo com relacao ao procedimento normal de diferencas finitas e tambem apresentado. (Autor)Original Title
Calculo de matrizes resposta por tecnicas de 'invariant imbedding'
Primary Subject
Source
Centro Tecnico Aeroespacial, Sao Jose dos Campos (Brazil); 330 p; 1986; p. 28-38; 6. National Meeting of Reactor Physics and Thermohydraulic; Sao Jose dos Campos, SP (Brazil); 3-5 Dec 1986
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Miscellaneous
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Conference
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