The Implementation of the Finite-Volume Dynamical Core in the Community Atmosphere Model

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A distributed memory message-passing parallel implementation of a finite-volume discretization of the primitive equations in the Community Atmosphere Model 3.0 is presented. These three-dimensional equations can be decoupled into a set of two-dimensional equations by the introduction of a floating vertical coordinate, resulting in considerable potential parallelism. Subsequent analysis of the data dependencies --in particular those arising from the polar singularity of the latitude-longitude coordinate system--suggests that two separate domain decompositions should be employed, each tailored for a different part of the model. The implementation requires that data be periodically redistributed between these two decompositions. Furthermore, data from nearest neighbors ... continued below

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Sawyer, W B & Mirin, A A July 26, 2005.

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A distributed memory message-passing parallel implementation of a finite-volume discretization of the primitive equations in the Community Atmosphere Model 3.0 is presented. These three-dimensional equations can be decoupled into a set of two-dimensional equations by the introduction of a floating vertical coordinate, resulting in considerable potential parallelism. Subsequent analysis of the data dependencies --in particular those arising from the polar singularity of the latitude-longitude coordinate system--suggests that two separate domain decompositions should be employed, each tailored for a different part of the model. The implementation requires that data be periodically redistributed between these two decompositions. Furthermore, data from nearest neighbors are kept in halo regions, which are updated between iterations. These data movements are optimized through one-sided communication primitives and multithreading. The resulting algorithm is shown to scale to very large machine configurations, even for relatively coarse resolutions.

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PDF-file: 17 pages; size: 0.8 Mbytes

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  • Presented at: First Indo-German Conference on PDE, Scientific Computing and Optimization in Applications, Trier, Germany, Sep 08 - Sep 10, 2004

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  • Report No.: UCRL-CONF-214013
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 877920
  • Archival Resource Key: ark:/67531/metadc876347

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  • July 26, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 29, 2016, 2:25 p.m.

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Sawyer, W B & Mirin, A A. The Implementation of the Finite-Volume Dynamical Core in the Community Atmosphere Model, article, July 26, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc876347/: accessed November 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.