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Title: (U) A Comparison of Threading Models in an Unstructured Mesh Mini-App

  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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Resource Relation:
Conference: Nuclear Explosives Code Development Conference (NECDC) ; 2014-10-20 - 2014-10-20 ; Los Alamos, New Mexico, United States
Country of Publication:
United States
Mathematics & Computing(97)

Citation Formats

Ferenbaugh, Charles Roger. (U) A Comparison of Threading Models in an Unstructured Mesh Mini-App. United States: N. p., 2015. Web.
Ferenbaugh, Charles Roger. (U) A Comparison of Threading Models in an Unstructured Mesh Mini-App. United States.
Ferenbaugh, Charles Roger. 2015. "(U) A Comparison of Threading Models in an Unstructured Mesh Mini-App". United States. doi:.
title = {(U) A Comparison of Threading Models in an Unstructured Mesh Mini-App},
author = {Ferenbaugh, Charles Roger},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2015,
month = 1

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  • Abstract not provided.
  • The relationship between the human asking questions and the code providing answers is being revised currently; the trend is toward a situation wherein each partner does what he/she/it does best. The human excels at processes requiring thought, such as analyzing the results of a simulation, and organizing lists of things to do and guidelines for doing them. Currently, the computer excels at following instructions and doing tedious, repetitive tasks without error. Thus, the human should ask the questions -- set up geometries -- specify boundary and source conditions -- and analyze the results. The code should decide, dynamically, during themore » evolution of the problem, where to refine the mesh and which algorithms to use in which regions of the problem in order to provide both accuracy and robustness. The ultimate code will be based on an unstructured mesh. It will involve the ability to do Free-Lagrange and ALE (Arbitrary-Langrangian-Eulerian) and it will dynamically adapt the mesh to suit the problem at hand. It will be capable of adopting other hydro algorithms and of including other physics options. At its heart will be a mesh manager that will decide which option is appropriate for each region of the problem. Free-Lagrange methods, ALE on a structured mesh, and adaptation are existing technologies. ALE requires a method for relaxing the mesh in regions of high fluid distortion and we do not yet have a robust method for relaxing an unstructured mesh. This paper addresses that problem.« less
  • A novel solution method has been developed to solve the coupled electron-photon transport problem on an unstructured triangular mesh. Instead of tackling the first-order form of the linear Boltzmann equation, this approach is based on the second-order form in conjunction with the conventional multi-group discrete-ordinates approximation. The highly forward-peaked electron scattering is modeled with a multigroup Legendre expansion derived from the Goudsmit-Saunderson theory. The finite element method is used to treat the spatial dependence. The solution method is unique in that the space-direction dependence is solved simultaneously, eliminating the need for the conventional inner iterations, a method that is wellmore » suited for massively parallel computers.« less