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<div class="">On Jan 9, 2020, at 4:25 PM, Matthew Knepley <<a href="mailto:knepley@gmail.com" class="">knepley@gmail.com</a>> wrote:</div>
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<div dir="ltr" class="">On Thu, Jan 9, 2020 at 1:35 PM 'Bisht, Gautam' via tdycores-dev <<a href="mailto:tdycores-dev@googlegroups.com" class="">tdycores-dev@googlegroups.com</a>> wrote:<br class="">
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> On Jan 9, 2020, at 2:58 PM, Jed Brown <<a href="mailto:jed@jedbrown.org" target="_blank" class="">jed@jedbrown.org</a>> wrote:<br class="">
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> "'Bisht, Gautam' via tdycores-dev" <<a href="mailto:tdycores-dev@googlegroups.com" target="_blank" class="">tdycores-dev@googlegroups.com</a>> writes:<br class="">
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>>> Do you need to rely on the element number, or would coordinates (of a<br class="">
>>> centroid?) be sufficient for your purposes? <span class="Apple-converted-space"> </span><br class="">
>><span class="Apple-converted-space"> </span><br class="">
>> I do need to rely on the element number. In my case, I have a mapping file that remaps data from one grid onto another grid. Though I’m currently creating a hexahedron mesh, in the future I would be reading in an unstructured grid from a file for which
I cannot rely on coordinates.<br class="">
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> How does the mapping file work and how is it generated?<br class="">
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In CESM/E3SM, the mapping file is used to map fluxes or states between grids of two components (e.g. land & atmosphere). The mapping method can be conservative, nearest neighbor, bilinear, etc. While CESM/E3SM uses ESMF_RegridWeightGen to generate the mapping
file, I’m using by own MATLAB script to create the mapping file.<br class="">
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I’m surprised that this is not an issue for other codes that are using DMPlex. E.g In PFLOTRAN, when a user creates a custom unstructured grid, they can specify material property for each grid cell. So, there should be a way to create a vectorscatter that will
scatter material property read in the “application”-order (i.e. order before calling DMPlexDistribute() ) to ghosted-order (i.e. order after calling DMPlexDistribute()).<br class="">
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<div class="">We did build something specific for this because some people wanted it. I wish I could purge this from all simulations. Its </div>
<div class="">definitely destructive, but this is the way the world currently is.</div>
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<div class="">You want this:</div>
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<div class=""> <a href="https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/DMPLEX/DMPlexNaturalToGlobalBegin.html" class="">https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/DMPLEX/DMPlexNaturalToGlobalBegin.html</a></div>
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<div>Perfect.</div>
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<div>Thanks.</div>
<div>-Gautam</div>
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<div class=""> Thanks,</div>
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<div class=""> Matt</div>
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> We can locate points and create interpolation with unstructured grids.<br class="">
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> --<span class="Apple-converted-space"> </span><br class="">
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<div class="">What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br class="">
-- Norbert Wiener</div>
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