The error "Failed to respect edge element on geometry edge" occurs.
First, due to continual improvements in meshing, make sure to use the latest version of COMSOL Multiphysics: Product Download
The mesh generator failed in making the elements compatible with the geometry object’s edges. The reason for this could be that the face mesh is too coarse or contains adjacent elements with large differences in scale. Another reason can be that some domains in the geometry are too narrow with respect to the rest of the geometry. 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.
COMSOL makes every reasonable effort to verify the information you view on this page. Resources and documents are provided for your information only, and COMSOL makes no explicit or implied claims to their validity. COMSOL does not assume any legal liability for the accuracy of the data disclosed. Any trademarks referenced in this document are the property of their respective owners. Consult your product manuals for complete trademark details.