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My question is somehow similar to this one here: I already conducted a simulation with OptiStruct similar to the one shown in the mentioned thread. I understand that possible contact surfaces are only defined in the undeformed state. However, my aim is to obtain a more advanced simulation. Is there a modeling approach that looks for new contact surfaces (within a defined search distance) during the calculation? Here is the hm-file of my test model: cylinder_cube_contact.hm And here a short outline of the model (unit system: N-mm-t-s): cube with edge length = 1 cylinder with diameter as well as length = 1 element size: 0.1 material: E = 210000 NU = 0.3 property card image: PSOLID force on each node = 1 (110 loaded nodes) all nodes at the lower side of the cube are constraint (dof 123456 locked) 2 sets of contact surfaces. one for each component interface card image: CONTACT type: FREEZE slave: cylinder contact surface master: cube contact surface MORIENT: NORM SRCHDIS = 0.01 load step: Linear static with SPC and LOAD analysis type defined