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arfc / sneks4me

Simplified Nek Simulations for Moltres Enhancement
BSD 3-Clause "New" or "Revised" License
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Mesh stringer tip + fluid #14

Closed anshchaube closed 5 years ago

anshchaube commented 5 years ago

Meshing the pyramid tip and the fluid around it is a non-trivial task, since the meshes need to be conformal. This issue can be closed when the stringer tip and some fluid above it have been meshed successfully and can be merged using prenek.

anshchaube commented 5 years ago

http://onelab.info/pipermail/gmsh/2016/010626.html

anshchaube commented 5 years ago

Trying to use gmsh's OpenCASCADE kernel to perform boolean operations, ran into multiple errors (Could not add plane surface / could not create face). Useful info: http://onelab.info/pipermail/gmsh/2018/012284.html

anshchaube commented 5 years ago

https://gitlab.onelab.info/gmsh/gmsh/issues/370 need to convert all built in entities to OpenCASCADE entities. >:(

dshaver-ANL commented 5 years ago

You need to do what now? Let me ask you a different question. If you wanted to just run this case in MOLTRES, how would you go about generating the mesh?

anshchaube commented 5 years ago

Gmsh has two kernels - the built-in and the OpenCASCADE. I need to OpenCASCADE to perform Boolean operations so I can separate the solid and the fluid meshes for prenek.

For Moltres, I would mesh the solid and fluid together. No need to separate them.

dshaver-ANL commented 5 years ago

can't you mesh them together, but as separate blocks, then write the blocks out to different files?

anshchaube commented 5 years ago

I think so, actually that's exactly what I'm trying to do. But that would require Boolean operations too, so that the surrounding fluid doesn't overlap with the graphite.

anshchaube commented 5 years ago

The way to do it without Boolean operations would be to manually define the coordinates for the fluid volume with the pyramid - like graphite tip cut out from the volume, which will be tricky and could lead to gaps, conformity issues...

anshchaube commented 5 years ago

Stringer tip height from Fig. 5.4 TM 728 - approximately 1 " (impossible to be more precise - measured from a "to-scale" diagram"

anshchaube commented 5 years ago

No longer necessary - for now, tip and stringer are being meshed together.