Govindan Nagappan
Ansys Employee

What are the error messages? Some error messages have an option to show problematic geometry if you right click on the message.

If the mesh fails for poor quality mesh, consider using a smaller mesh size. You can also set check mesh quality to No in details of mesh.

You can also use curvature/proximity refinements aftter turning off adaptive meshing in details of mesh. But this could increase the number of nodes and elements. 

Is it solid or shell model? If this is solid, can this be represented with shell model. You can import the midsurface and mesh with shells.