Radiation transport calculations on unstructured grids using a spatially decomposed and threaded algorithm

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We consider the solution of time-dependent, energy-dependent, discrete ordinates, and nonlinear radiative transfer problems on three-dimensional unstructured spatial grids. We discuss the solution of this class of transport problems, using the code TETON, on large distributed-memory multinode computers having multiple processors per ''node'' (e.g. the IBM-SP). We discuss the use of both spatial decomposition using message passing between ''nodes'' and a threading algorithm in angle on each ''node''. We present timing studies to show how this algorithm scales to hundreds and thousands of processors. We also present an energy group ''batching'' algorithm that greatly enhances cache performance. Our conclusion, after ... continued below

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1.2 Megabytes pages

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Nemanic, M K & Nowak, P April 12, 1999.

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Description

We consider the solution of time-dependent, energy-dependent, discrete ordinates, and nonlinear radiative transfer problems on three-dimensional unstructured spatial grids. We discuss the solution of this class of transport problems, using the code TETON, on large distributed-memory multinode computers having multiple processors per ''node'' (e.g. the IBM-SP). We discuss the use of both spatial decomposition using message passing between ''nodes'' and a threading algorithm in angle on each ''node''. We present timing studies to show how this algorithm scales to hundreds and thousands of processors. We also present an energy group ''batching'' algorithm that greatly enhances cache performance. Our conclusion, after considering cache performance, storage limitations and dependencies inherent in the physics, is that a model that uses a combination of message-passing and threading is superior to one that uses message-passing alone. We present numerical evidence to support our conclusion.

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1.2 Megabytes pages

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  • Mathematics and Computation, Reactor Physics and Environmental Analysis in Nuclear Applications, Madrid (ES), 09/27/1999--09/30/1999

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  • Report No.: UCRL-JC-133787
  • Report No.: DP0101031
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 14136
  • Archival Resource Key: ark:/67531/metadc621297

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  • April 12, 1999

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  • June 16, 2015, 7:43 a.m.

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  • May 6, 2016, 1:55 p.m.

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Nemanic, M K & Nowak, P. Radiation transport calculations on unstructured grids using a spatially decomposed and threaded algorithm, article, April 12, 1999; California. (digital.library.unt.edu/ark:/67531/metadc621297/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.