Make-periodic to 3-D dimpled pipe
 

I'm making a 3-D dimpled pipe. When i made periodic zone to Inlet and outlet the wall, there is an error message said.

" Warning: different number of faces on these threads.
computed translation deltas: 0.000041 0.000004 -0.319994
zone 6: matched 0 out of 1174 faces.
zone 7: matched 0 out of 1142 faces"

I am not sure if it is because of the geometry. If i solve it without doing periodic, the result is correct.
Can anyone give me some suggestions :confused::confused: