added faces problems with tetra mesh check
 

Hello,everyone

I'm trying to mesh a volute with tetra mesh.
The mesh check shows there are several elements with problem"added faces" and "Delaunary vioaltion". When I load the mesh into cfx, the cells with "added faces" are lost.
How can I fix this problem?
Thank you for your help and time.

Have you done a build topology first ?

Yes! I built the topology. But it is still there.
I made screenshots. The elements are belong to different parts.

it looks like you have two surfaces sharing one edge, if so have you activated thin cut ??

Regarding mesh Quality improvement
 

I am applying prism layer with tetra mesh but the quality below 0.3 is too many nearly 15000 si its difficult to improve the quality by manually . please suggest how to improve the quality with prism layer .