Dear All, I'm trying to set a pair of cyclic boundaries for my mesh. As I know the two surfaces I'm gonna match are not one to one, I have decided to use Match Option of Arbitrary. However, when i have tried to apply it, there was always an error message came out, saying the offsets of cyclic regions are not opposite. I know that there must be something wrong with my offsets values. Therefore, I would like to know how i can fix this problems and how i can determine the values of the offset values when i try to define the cyclic boundaries. Thanks a lot!

Derek

Try adding minus sign on one of the sides. Dont know which side, u have to try.