Periodic Boundary Condition in Convective Heat Transfer

Hello everyone, I’m trying to apply translational periodic boundary conditions in 2 faces (front and back) using the Convective Heat Transfer simulation.
However, there is not an option saying Periodic in boundary conditions.
Therefore is it possible to apply that type of BC with custom BC? What are the options?

Right now I put the following options:

The project link is here

Thank you,

Hello foxincfd,
thanks for reaching out to us here in the forum.

Please have a look at this page on the set up of the custom boundary page:

Best regards Sebastian