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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 Six and Sixteen Group Cross Sections for Fast and Intermediate Critical Assemblies by : Gordon Edward Hansen
Download or read book Six and Sixteen Group Cross Sections for Fast and Intermediate Critical Assemblies written by Gordon Edward Hansen and published by . This book was released on 1961 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Book Synopsis Two-Group Neutron Transport Theory with Anisotropic Scattering by : Klaus Oswald Thielheim
Download or read book Two-Group Neutron Transport Theory with Anisotropic Scattering written by Klaus Oswald Thielheim and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Finite Element Methods for Particle Transport by : Ron Tunstall Ackroyd
Download or read book Finite Element Methods for Particle Transport written by Ron Tunstall Ackroyd and published by Taylor & Francis Group. This book was released on 1997 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt: Focuses on the transport of neutral particles, neutrons and photons, using the finite element method to address practical problems in nuclear power and mineral prospecting. Includes discussions of how the method began and has matured to become a practical tool complementing the stochastic Monte Carlo method, spatial finite elements, examples of calculations, equivalent forms of the Boltzmann equation, neutron streaming in voids, some aspects of discontinuous variational solutions, complementary principles and benchmarking, time-dependent transport, and modelling three-dimensional systems. Double spaced. Annotation copyright by Book News, Inc., Portland, OR
Book Synopsis Engineering Compendium on Radiation Shielding: Shielding fundamentals and methods by :
Download or read book Engineering Compendium on Radiation Shielding: Shielding fundamentals and methods written by and published by . This book was released on 1968 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1977 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the 8th International Conference on Radiation Shielding, Arlington, Texas, April 24-28, 1994 by :
Download or read book Proceedings of the 8th International Conference on Radiation Shielding, Arlington, Texas, April 24-28, 1994 written by and published by . This book was released on 1994 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nuclear Cross Sections and Technology by : Roald A. Schrack
Download or read book Nuclear Cross Sections and Technology written by Roald A. Schrack and published by . This book was released on 1975 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nuclear Cross Sections and Technology by : Roald Amundsen Schrack
Download or read book Nuclear Cross Sections and Technology written by Roald Amundsen Schrack and published by . This book was released on 1975 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Anisotropic Scattering of Electrons by N2 and Its Effects on Electron Transport by : A. V. Phelps
Download or read book Anisotropic Scattering of Electrons by N2 and Its Effects on Electron Transport written by A. V. Phelps and published by . This book was released on 1985 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :International Atomic Energy Agency Publisher :Springer Science & Business Media ISBN 13 :3662258587 Total Pages :551 pages Book Rating :4.6/5 (622 download)
Book Synopsis Engineering Compendium on Radiation Shielding by : International Atomic Energy Agency
Download or read book Engineering Compendium on Radiation Shielding written by International Atomic Energy Agency and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 551 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need has arisen for a comprehensive handbook for engineers faced with problems of radiation shielding design. Although there are several excellent books on shielding, they either do not give enough consideration to the many practical design problems, or are limited to special aspects of the subject. Recognizing the universal need, the International Atomic Energy Agency decided to sponsor the publication ofthe present Engineering Compendium on Radiation Shield ing. At the first editorial discussions it was agreed that, if such a book were to be undertaken, it would be appropriate not only to create a useful design tool for the practising engineer but also to include well-referenced basic data for the research worker. Although trying to keep the book down to a reasonable size, the editors have aimed at a complete presentation of the subject, covering and linking both the tech nology and the science of shielding. Efforts to make terms and definitions consistent throughout have been only partially successful, owing to the continuing development of new ideas. However, inconsisten cies that could not be eliminated are identified whenever possible.
Book Synopsis Papers of Ship Research Institute by : Senpaku Gijutsu Kenkyūjo (Japan)
Download or read book Papers of Ship Research Institute written by Senpaku Gijutsu Kenkyūjo (Japan) and published by . This book was released on 1964 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1978 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NBS Special Publication written by and published by . This book was released on 1968 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
