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Hello, I would like to simulate a void as a region within my model that should not experience any deformation - to not damage any structure that may be place there e.g. a bearing. This is to be for a topology optimisation simulation, then how (if it is possible) can it be approached so that the optimal topology maintains the shape of the void? To expand, if I have a circular hole where a bearing should be placed and I do not want the deformation of the model to damage this bearing, how can I contrain the hole to maintain its shape during the topology optimisation? I would not like to use RBE2s or a nondesign space as this will effect the way the load paths are transferred. Will RBE3s work? If not, is there an alternative? Thank you in advance.