Search Results - "Filho, Hermes Alves"

A hybrid spectral nodal method for multigroup X,Y-geometry discrete ordinates eigenvalue problems by Silva, Davi José M., Alves Filho, Hermes, Barros, Ricardo C.

“…A hybrid spectral nodal method is developed for the solution of multigroup discrete ordinates (SN) eigenvalue problems with isotropic scattering in X,Y…”
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The spectral nodal method applied to multigroup S N neutron transport problems in One-Dimensional geometry with Fixed–Source by Oliva, Amaury Muñoz, Filho, Hermes Alves, Martins e Silva, Davi José, García Hernández, Carlos Rafael

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A composite spatial grid spectral Green's function method for one speed discrete ordinates eigenvalue problems in two-dimensional Cartesian geometry by Dominguez, Dany S., Rocha, Rogério V.M., Iglesias, Susana M., Escrivá, Alberto, Alves Filho, Hermes

“…Spectral Green's function nodal methods (SGF) are well established as a class of coarse mesh methods. For this reason, they are widely used in the solution of…”
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The application of spectral nodal methods to discrete ordinates and diffusion problems in Cartesian geometry for neutron multiplying systems by Barros, Ricardo C., Filho, Hermes Alves, Valero Orellana, Esbel T., da Silva, Fernando Carvalho, do Couto, Nozimar, Dominguez, Dany S., Hernández, Carlos R.G.

“…We describe in this paper the recent advances in spectral nodal methods applied to discrete ordinates (S N) and diffusion problems in Cartesian geometry for…”
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Complex Eigenvalues Analysis of the SN equations for deterministic coarse-mesh methods development applied in one-dimensional neutron shielding calculation by Libotte, Rafael Barbosa, Alves Filho, Hermes, Silva, Fernando Carvalho da

“…When using spectral nodal methods in the solution of fixed-source problems, one of the steps involves obtaining the intranodal homogeneous solution of the…”
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Technique for reducing time in the calculation of eigenvalues and eigenvectors applied in neutron transport fixed-source problems by Libotte, Rafael, Alves Filho, Hermes, Carvalho da Silva, Fernando

“…In this work, a mathematical technique to accelerate the eigenvalue calculations, originally proposed for the Analytical Discrete Ordinates method (ADO), is…”
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Analytical reconstruction scheme for the coarse-mesh solution generated by the spectral nodal method for neutral particle discrete ordinates transport model in slab geometry by Barros, Ricardo C., Filho, Hermes Alves, Platt, Gustavo M., Oliveira, Francisco Bruno S., Militão, Damiano S.

“…Coarse-mesh numerical methods are very efficient in the sense that they generate accurate results in short computational time, as the number of floating point…”
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Spectral-Nodal Deterministic Methodology for Neutron Shielding Calculations using the X, Y - geometry Multigroup Transport Equation in the Discrete Ordinates Formulation by Oliva, Amaury Munoz, Alves Filho, Hermes

“…In this work, we present the most recent numerical results in a nodal approach, which resulted in the development of a new numerical spectral nodal method,…”
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A Metropolis algorithm combined with Nelder–Mead Simplex applied to nuclear reactor core design by Sacco, Wagner F., Filho, Hermes Alves, Henderson, Nélio, de Oliveira, Cassiano R.E.

“…A hybridization of the recently introduced Particle Collision Algorithm (PCA) and the Nelder–Mead Simplex algorithm is introduced and applied to a core design…”
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Composite spatial grid spectral nodal method for one-speed discrete ordinates deep penetration problems in X, Y geometry by Dominguez, Dany S., Oliveira, Francisco B.S., Filho, Hermes Alves, Barros, Ricardo C.

“…Computer modeling of radiation deep penetration problems is historically based on the discrete ordinates ( S N) formulation. For efficiency reasons, besides…”
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A Metropolis Algorithm applied to a Nuclear Power Plant Auxiliary Feedwater System surveillance tests policy optimization by Sacco, Wagner F., Lapa, Celso M.F., Pereira, Cláudio M.N.A., Alves Filho, Hermes

“…The Particle Collision Algorithm (PCA) is a Metropolis-based algorithm loosely inspired by the physics of nuclear particle collision reactions, particularly…”
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A NOVEL COARSE-MESH METHOD APPLIED TO NEUTRON SHIELDING PROBLEMS USING THE MULTIGROUP TRANSPORT THEORY IN DISCRETE ORDINATES FORMULATIONS by Libotte, Rafael Barbosa, Alves Filho, Hermes, De Barros, Ricardo Carvalho

“…In this paper, we propose a new deterministic numerical methodology to solve the one-dimensional linearized Boltzmann equation applied to neutron shielding…”
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Progress in the formulation of the approximate albedo boundary conditions for one-speed X, Y-geometry discrete ordinates and diffusion eigenvalue problems by Barros, Ricardo C., Filho, Hermes Alves, do Couto, Nozimar

“…We discuss in this paper the efficiency of approximate discrete ordinates (S N) and diffusion albedo boundary conditions for one-speed eigenvalue problems in…”
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Spectral Nodal Methodology for Multigroup Slab-Geometry Discrete Ordinates Neutron Transport Problems with Linearly Anisotropic Scattering by Muñoz Oliva, Amaury, Alves Filho, Hermes, Martins e Silva, Davi José, García Hernández, Carlos Rafael

“…In this paper, we propose a numerical methodology for the development of a method of the spectral nodal class that generates numerical solutions free from…”
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The modified spectral deterministic method applied to fixed–source discrete ordinates problems in X,Y–geometry by Curbelo, Jesús Pérez, Libotte, Rafael Barbosa, Oliva, Amaury Muñoz, Barros, Ricardo Carvalho, Alves Filho, Hermes

“…A new approach for the application of the coarse–mesh Modified Spectral Deterministic method to numerically solve the two–dimensional neutron transport…”
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Seção Especial sobre Energia Nuclear - Apresentação by Alves Filho, Hermes, Silva, Fernando Carvalho

“…Apresentação da Seção Especial sobre Energia Nuclear…”
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Avanços Recentes na Aplicação de um Método Numérico Espectronodal para Solução de Problemas Unidimensionais de Blindagem de Nêutrons by Libotte, Rafael, Alves Filho, Hermes, Silva, Fernando Carvalho

“…Neste trabalho, é mostrada a aplicação de um método da classe dos espectronodais (malha grossa) na solução de problemas de blindagem de nêutrons em geometria…”
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A response matrix spectral nodal method for energy multigroup X,Y-geometry discrete ordinates problems in non-multiplying media by da Silva, Odair Pinheiro, Guida, Mateus R., Filho, Hermes Alves, Barros, Ricardo C.

“…A new spectral nodal method is proposed for coarse-mesh numerical solution of energy multigroup X,Y-geometry discrete ordinates (SN) transport problems in…”
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Estimation of neutron sources driving prescribed power generations in subcritical systems using one-speed two-dimensional discrete ordinates formulations by Moraes, Leonardo R.C., Alves Filho, Hermes, Barros, Ricardo C.

“…•Estimation of uniform neutron source to drive a subcritical multiplying system at a steady prescribed power distribution.•The coarse-mesh response…”
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Implementação computacional de metodologia analítica de solução da equação de transporte de nêutrons em geometria planar utilizando o método P_N by Silva, Alan Souza, Barros, Ricardo Carvalho, Alves Filho, Hermes

“…É apresentada neste artigo uma metodologia sintética analítica de solução da equação de transporte de nêutrons em geometria unidimensional utilizando a teoria…”
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