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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estudo da sensibilidade do problema de transporte de radiação em meio espalhador

Nunes, Rogerio Chaffin, Instituto de Engenharia Nuclear 03 1900 (has links)
Submitted by Marcele Costal de Castro (costalcastro@gmail.com) on 2017-09-27T18:38:57Z No. of bitstreams: 1 ROGÉRIO CHAFFIN NUNES M.pdf: 4263425 bytes, checksum: 72470f03b0ac1bfacef737604028b07e (MD5) / Made available in DSpace on 2017-09-27T18:38:57Z (GMT). No. of bitstreams: 1 ROGÉRIO CHAFFIN NUNES M.pdf: 4263425 bytes, checksum: 72470f03b0ac1bfacef737604028b07e (MD5) Previous issue date: 2002-03 / Neste trabalho, o sistema de equações diferenciais obtidos pela aproximação angular da equação de transporte bidimensional pelo método de ordenadas discretas e resolvido através da formulação de elementos finitos com o objetivo de investigar a sensibilidade do fluxo emergente de radiação com o fluxo incidente e as propriedades de absorção e espalhamento do meio. A formulação variacional para o sisterna de equações diferenciais de 2ª ordem com condições de fronteira de Neumann generalizadas (3° tipo) permite uma fácil implementação do método dos elementos finitos com malha triangular e espaço de aproximação de 1ª ordem. A geometria escolhida para as simulações a um circulo com uma não homogeneidade de forma circular em seu interior. O mapeamento de Dirichlet-Neumann e estudado através de diversas simulações envolvendo o fluxo incidente, o fluxo emergente e as propriedades do meio. / In this work, the system of differential equations obtained by the angular approach of the two-dimensional transport equation by the discrete ordinates method is solved through the formulation of finite elements with the objective of investigating the sensitivity of the outgoing flux of radiation with the incoming flux and the properties of absorption and scattering of the medium. The variational formulation for the system of differential equations of 2nd order with the generalized boundary conditions of Neumann (3rd type) allows an easy implementation of the method of the finite elements with triangular mesh and approximation space of 1st order. The geometry chosen for the simulations is a circle with a non homogeneous circular form in its interior. The mapping of Dirichlet-Neumann is studied through various simulations involving the incoming flux, the outgoing flux and the properties of the medium.

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