If the "Allow microholes" checkbox in the "Method" section of the "General" tab is activated, the solid mesh will be created with high quality elements.  The parameters that will be considered during the creation of the high quality elements include aspect ratio, collapse ratio, edge angle, twist, taper angle, skew angle and warp angle.  Towards the center of the part, small voids, or microholes, may remain to facilitate the proliferation of higher quality elements. The microholes will be very small relative to the volume of the part and will be located as far from the surface of the part as possible in order to minimize the effect on the areas where a high stress is expected.

 

If you have run an analysis on a part with the NASTRAN processor and received warnings referring to the element quality, activating this option and regenerating the solid mesh may eliminate these warnings.

 

For models with complex geometric features, activating this option may result in shorter solid meshing times.  For more information on microholes, see The Effects of Microholes within a Solid Mesh.

---