It is a 3D cubic cell model out of a whole material, and it is necessary to make sure that this cell can represent the whole material so the node forece of the corresponding nodes on the opposite surface should have the same value and opposite direction, but I have no idea about how to control the nodes force (maybe *EQUATION ?), because untill now all the boundary control method is about controlling the displacement. Does anybody know how? Thank you guys so much!
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