Reply To: Input periodic boundary conditions in a unit cell

[mjmiddle]

My apologies, the linear periodic is only supported in one direction. Refer to post:

/forum/forums/topic/linear-periodic-bcs-in-both-x-and-z-directions-causing-meshing-error/

You can try using a frictionless support on the boundaries of the other direction. This sets up essentially the same constraints as a mirror condition in a structural analysis. A mirror condition is not the same as linear periodic but it may suffice depending on the loading.