The error "A degenerated tetrahedron was created" occurs.
First, due to continual improvements in meshing, make sure to use the latest version of COMSOL Multiphysics: Product Download
The mesh generator ran into numerical difficulties while creating tetrahedrons with a size based on user-controlled meshing parameters. Causes could be too small and narrow domains relative to the rest of the geometry or exceedingly short boundary segments. Try to avoid creating small and narrow domains and very short boundary segments that are adjacent to longer boundary segments. Use Remove Details and Virtual Operations to clean up the geometry. Check the information in the error message for details about location and possible cause of the problem. Also see the section "Troubleshooting Free Tetrahedral Mesh Generation" in the COMSOL documentation.
If possible, send the model file which is causing the issue to COMSOL Technical Support.
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