Learning Forum

[Sampat Kumar]

Hi 
Thanks for your patience. 
I hope you have tried to convert the facets body into a solid body (don't merge faces) before importing it into mechanical. 
As I can see from the details of the mesh, the minimum edge length is zero under the sizing. there might be a chance that some elements in your model collapse to a point that causes issues. 
I would suggest repairing the geometry and then trying to generate the mesh. 

Best Regards,
Sampat