I need to constrain a few beams (or nodes) within such a domain, somehow like a well with elastic walls. I am thinking of creating 4 extra nodes and connceting them to the modelled nodes (or beams)using spring elements and with certain gap between the springs and the nodes - so they can move freely before touching on the springs. But I don't know how to do the gaps.
Or, there's any simplier way to do this?
Have I addressed this clearly?
Thanks for any kind advice