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  • Diffusion Accelerated Implicit Monte Carlo via Nonlinear Elimination for Thermal Radiative Transfer

    Creator:
    Lam, Adam Q.
    Abstract:
    In this dissertation, we derive and implement a new transport-diffusion hybrid algorithm for solving thermal radiative transfer (TRT) problems. Using the method of nonlinear elimination (NLEM), the TRT system of equations can be written in terms of a transport equation with the absence of scattering and a diffusion equation. The...
    Resource Type:
    Dissertation
    Full Text:
    : Todd S. Palmer In this dissertation, we derive and implement a new transport-diffusion hybrid al

  • Generation of Multigroup Multiband Cross Sections with Monte Carlo Simulations

    Creator:
    Lam, Adam Q.
    Abstract:
    This is the investigation into The generation of high-fidelity multigroup multiband cross sections from Monte Carlo neutron transport simulations. Previous methods for generating multigroup multiband (MGMB) cross sections, and multigroup cross sections, assume an approximate shape for the scalar flux. This approximate flux shape is the product of an energy-dependent...
    Resource Type:
    Masters Thesis
    Full Text:
    Multiband Cross Sections with Monte Carlo Simulations. Abstract approved: Todd S. Palmer A novel method

  • Evaluation of ²³⁵U and ²³⁸U Fast Fission Product Yields from Godiva-IV Burst Irradiation via Gamma Detection

    Creator:
    Tamashiro, Aaron S.
    Abstract:
    During the past few decades, the U.S. Department of Energy (DOE) has made significant investments to improve nuclear data libraries, as the quality of this data impacts nearly all analyses of nuclear systems. Nuclear fission product yields are one component of these libraries, and are important for the analysis of...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF Aaron S. Tamashiro for the degree

  • An assessment of a mesh-based method for slab-geometry transport in stochastic materials

    Creator:
    Bassett, Brody R.
    Abstract:
    There exists a variety of methods to solve the radiation transport equation in stochastic materials, including the Levermore-Pomraning method and the atomic mix method, each of which is designed to replicate the results given by benchmarks with materials rearranged in a randomized fashion. While the atomic mix method is very...
    Resource Type:
    Masters Thesis
    Full Text:
    a Mesh-Based Method for Slab-Geometry Transport in Stochastic Materials Abstract approved: Todd S

  • Coarse mesh and one-cell block inversion based diffusion synthetic acceleration

    Creator:
    Kim, Kang-Seog
    Abstract:
    DSA (Diffusion Synthetic Acceleration) has been developed to accelerate the SN transport iteration. We have developed solution techniques for the diffusion equations of FLBLD (Fully Lumped Bilinear Discontinuous), SCB (Simple Corner Balance) and UCB (Upstream Corner Balance) modified 4-step DSA in x-y geometry. Our first multi-level method includes a block...
    Resource Type:
    Dissertation
    Full Text:
    . Steve E. Binney, Jr., Dr. Jack F. Higginbotham and Dr. Kenneth S. Krane. I would appreciate the

  • Analysis of the method of tubes characteristic schemes in the thick diffusive limit

    Creator:
    Rising, Michael E.
    Abstract:
    Characteristic methods are widely known to be very accurate approaches to the solution of numerical transport problems. These methods are most often used for neutron transport applications (i.e. lattice physics calculations) where spatial cells are of intermediate optical thickness (O(1) - O(100) mean free paths, depending on the energy group)...
    Resource Type:
    Masters Thesis
    Full Text:
    Department of Nuclear Engineering and Radiation Health Physics, Dr. Kenneth Krane from the Department of

  • The iterative thermal emission Monte Carlo method for thermal radiative transfer

    Creator:
    Long, Alex R.
    Abstract:
    For over 30 years, the Implicit Monte Carlo (IMC) method has been used to solve challenging problems in thermal radiative transfer. These problems are typically optically thick and di ffusive, as a consequence of the high degree of "pseudo-scattering" introduced to model the absorption and reemission of photons from a...
    Resource Type:
    Masters Thesis
    Full Text:
    Monte Carlo Method for Thermal Radiative Transfer. Abstract approved: Todd S. Palmer For over 30

  • Applying Machine Learning Algorithms to Identify Problematic Nuclear Data within Nuclear Transport Simulations

    Creator:
    Grechanuk, Pavel A.
    Abstract:
    The primary goal of this dissertation is to improve the quality of nuclear data available to the nuclear science community. We propose to accomplish this by applying machine learning algorithms to the large number of available benchmark experiments and simulations, with the goal of determining which nuclear data have strong...
    Resource Type:
    Dissertation
    Full Text:
    Simulations Abstract approved: Todd S. Palmer The primary goal of this dissertation is to improve the

  • Detection of actinides via nuclear isomer de-excitation

    Creator:
    Francy, Christopher J.
    Abstract:
    The detection of illicit weapons-grade nuclear material is a significant technical challenge receiving a great deal of attention in the nuclear community. A proposed solution is to actively bombard the material under investigation with neutrons, populating nuclear isomers in any potential fissile material. These isomers decay quickly, releasing gamma rays...
    Resource Type:
    Masters Thesis
    Full Text:
    : __________________________________________________________ Todd S. Palmer The detection of illicit weapons-grade nuclear material is a significant