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[ICEM] Repairing bad volume elements

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Old   September 25, 2013, 02:50
Default Repairing bad volume elements
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siw
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Hi,

I'm making a tetra/prism mesh and as is usually the case the prisms have greatly deteriorated the quality of regions of tetra cells. No amount of smoothing (with the various options) will improve these tetra cells which I've put into a subset. So I tried the Repair Mesh > Remesh Bad Elements but this does nothing because these are tetra cells and not surface tri or quad. I thought about just deleteing these bad cells (and maybe 1 layer around them just to be on the safe side) and getting ICEM to remesh the void in the mesh. Has anyone done that and had success or suggest an alternative? BTW, I make the prisms based on PSYMN's tetra/prism presentation.

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Old   September 25, 2013, 15:57
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what are the steps you follow to generate your tetra/prism ? have you tried an alternative way ?
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Old   September 26, 2013, 02:20
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I make the tetra/prism mesh by:

1) Make octree volume mesh. Delete volume elements. Check mesh. Smooth until quality does not improve.
2) Make Delaunay volume mesh. Check mesh. Smooth until quality does not improve.
3) Make floating prism mesh. Check mesh. Smooth quality with PENTA on < 0.05. Smooth with PENTA frozen.
4) Split and redistribute prisms.
5) Get annoyed when ICEM deteriorates tetra mesh after prism generation. Fight and lose against ICEM when trying to repair bad tetra elements to improve quality.

The only alternative method I have tried is not to float the prisms, but rather specifiy a first layer height and total number of layers. That makes the mesh even worse and pyramids are made.
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Old   September 26, 2013, 14:05
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yeah you are doing good, SOMETIMES, floating instead of frozen gets me a better mesh, I don't know why, and sometimes, smoothing everything get me a better mesh also. may be you should try it. but in the end, you can't do nothing but keep the number of those bad elements as small as possible
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Old   January 8, 2014, 15:42
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Guessing this has been sorted...

Could we have a link to this Tetra/prism mesh presentation please.

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Old   January 9, 2014, 03:19
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here is the link Simon's great tools (tips,tricks+ refinement)
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