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Positive Anisotropic Group Scattering Cross Sections For Radiation Transport
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Book Synopsis Positive Anisotropic Group Scattering Cross Sections for Radiation Transport by : J. Mark DelGrande
Download or read book Positive Anisotropic Group Scattering Cross Sections for Radiation Transport written by J. Mark DelGrande and published by . This book was released on 1999-05-01 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: In solving the Boltzmann transport equation, most discrete ordinates codes calculate the source term by first approximating the scattering cross section using a Legendre polynomial expansion. Such expansions are insufficient when scattering is anisotropic and the Legendre expansion is truncated prematurely. This can lead to nonphysical negative cross sections, negative source terms and negative angular fluxes. While negative sources are problematic for standard discrete ordinates methods leading to poor convergence or convergence to incorrect results, they are of particular concern to exponential methods, causing such calculations to fail. We've developed and tested a new technique to solve this problem called the Monte Carlo Facet Method. This method is an extension of standard Monte Carlo techniques. It guarantees non-negative cross sections at all directional ordinates. It also ensures within group and next group scatter. This dissertation outlines previous attempts to handle anisotropic scattering to achieve non-negative sources. It develops the theory of the Monte Carlo facet method and its first angular moment conservation. Results are presented examining the scattering matrices for various materials, and finally demonstrating that these scattering matrices perform exceptionally well in a multi-group, anisotropic, unstructured mesh discrete ordinates transport code.
Book Synopsis Efficient and Accurate Computation of Non-Negative Anisotropic Group Scattering Cross Sections for Discrete Ordinates and Monte Carlo Radiation Transport by : David W. Gerts
Download or read book Efficient and Accurate Computation of Non-Negative Anisotropic Group Scattering Cross Sections for Discrete Ordinates and Monte Carlo Radiation Transport written by David W. Gerts and published by . This book was released on 2002-07 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new method for approximating anisotropic, multi-group scatter cross sections for use in discretized and Monte Carlo multi-group neutron transport is presented. The new method eliminates unphysical artifacts such as negative group scatter cross sections and falsely positive cross sections. Additionally, when combined with the discrete elements angular quadrature method, the new cross sections eliminate the lack of angular support in the discrete ordinates quadrature method. The new method generates piecewise-average group-to-group scatter cross sections. The accuracy and efficiency for calculating the discrete elements cross sections has improved by many orders of magnitude compared to DelGrande and Mathews previous implementation. The new cross sections have extended the discrete elements method to all neutron-producing representations in the Evaluated Nuclear Data Files. The new cross section method has been validated and tested with the cross section generation code, NJOY. Results of transport calculations using discrete elements, discrete ordinates, and Monte Carlo methods for two, one-dimensional slab geometry problems are compared.
Book Synopsis Programme du cabaret "La Pie qui chante", pour la revue "Entre cuir et chair!" revue en un acte d'Hugues Delorme et C.A. Carpentier by :
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Book Synopsis A 12 Group Set of Photon Cross Sections for Use in Anisotropic Sn Calculations of Photon Transport by : W.M.M. Kerr
Download or read book A 12 Group Set of Photon Cross Sections for Use in Anisotropic Sn Calculations of Photon Transport written by W.M.M. Kerr and published by . This book was released on 1965 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis Scientific and Technical Aerospace Reports by :
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Book Synopsis The Physics Problems of Reactor Shielding by : International Atomic Energy Agency
Download or read book The Physics Problems of Reactor Shielding written by International Atomic Energy Agency and published by . This book was released on 1971 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis ERDA Energy Research Abstracts by : United States. Energy Research and Development Administration
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Book Synopsis Handbook of Nuclear Engineering by : Dan Gabriel Cacuci
Download or read book Handbook of Nuclear Engineering written by Dan Gabriel Cacuci and published by Springer Science & Business Media. This book was released on 2010-09-14 with total page 3701 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an authoritative compilation of information regarding methods and data used in all phases of nuclear engineering. Addressing nuclear engineers and scientists at all levels, this book provides a condensed reference on nuclear engineering since 1958.
Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1983 with total page 1144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
