Requirements for the shell mesh for tetrameshing:
• Enclose one, and only one, continuous volume
• There can be no free edges. (Otherwise not a solid geometry)
• There can be no T-connected edges.
• There can be no duplicates in the mesh.
• Elements should not fold over and overlap each other
• Avoid very low minimum tria angles
• Avoid a large difference in size between adjacent elements
• Avoid a large difference is size between two sides of a wall thickness
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Further information on http://www.altairhyperworks.de/yaf/default.aspx
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