Already did input the tank displacement, but the Expansion Joint Modeler didn't seem to have acknowledge the displacement.
There will be no problem with the actual expansion joint design because it can take up to 100mm of lateral displacement.
As for the modeling, yes, I have modeled it with two bellows with connecting spool in between and a tie rod running through the middle for the axial restraints. The part that got me stuck is how should I consider the restraints, of it's location and type, for it to be able to move laterally.
Thx for your feedback guys.
Regards,
Fesh