Pinned Grain Growth Progress Report Presentation III

Fred Hohman, David Montes de Oca Zapiain

12 00 AM ,Wed, Oct 28 2015

Outline

  • Current Status
  • Preliminary I/O for our surrogate model
  • Analysis of PCA results

Current Simulations Performed

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I/O

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Chord Length Detailed

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Expansion of our Workflow

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Some Preliminary PCA Results

  • 1 case (specific pin shape, pin percentage) for 10 time-steps
  • Can already see converging to steady state by clustering of data points
  • Cross correlation of boundary and pins

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  • 3 cases varying pin shape for given percentage for 5 time-steps
  • Can see path in PCA space as microstructure evolves

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So, Our Input PCA Data Matrix…

  • Remember our data matrix from presentation II?
  • Size: (n_simulations, 300^3) => (184, 27000000)
  • Main issue in 3D 2pt statistics of 300^3 microstructure computation is memory

So, Our Input PCA Data Matrix…

  • That’s big (really big)
  • We need a better way to work with this
    • Suggestions welcomed
    • Planning to talk to Ahmet about recent reduction work
    • 2pt statistics in 2D tappers off, expect similar feature in 3D

Attempt of PCA on Chord Length Distribution

  • Example of what not to do
  • PCA on chord length distribution without normalization

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Next Steps

  1. Determine appropriate truncation of microstructure data to perform PCA without the need for large amounts of memory
    • Talking to Ahmet
  2. Gather all chord length distribution data
    • Done as of this morning!
  3. Run PCA on normalized chord length data
  4. Work with David Brough to use latest fitting code to create linkages

Questions or Suggestions?

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