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Ray-tracing of Unstructured Meshes for Material Fractions #38

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erelson opened this issue Feb 19, 2013 · 4 comments
Open

Ray-tracing of Unstructured Meshes for Material Fractions #38

erelson opened this issue Feb 19, 2013 · 4 comments

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@erelson
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erelson commented Feb 19, 2013

As a precursor to running ALARA in the unstructured mesh workflow, the material fractions of each tetrahedron are needed.

Currently:

  • mmGridGen/mmgrid.py do this ray-tracing for structured meshes
  • Ray-tracing on unstructured meshes is done by DAGMC.

Am I correct that uniformly sampling a tet with rays is an open research question? Maybe something for an NE506 project? But might also need to be done sooner than that...

Derived from #3.

@elliottbiondo
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Shouldn't every tet only have 1 material?

@erelson
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erelson commented Feb 19, 2013

That requires a conformal mesh, which isn't necessarily guaranteed (e.g. cylinders), especially if the geometry is originally an MCNP model, rather than a meshed CAD model. Or such is my understanding.

@gonuke
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gonuke commented Feb 19, 2013

We can delay this by assuming conformal mesh to begin.

@erelson
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erelson commented Mar 4, 2013

Using the conformal mesh assumption, the material at each voxel's center point is determined and tagged to the mesh.

Relevant commit: d2e306a

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