Below is an image of my geometry, I am trying to make the geometry in the middle thermally expand within the circular geometry, which produces a compression through those arms. However when i run the simulation the arms go through the circular geometry as shown in the second image. I have tried playing around with contacts etc and had no luck. I want that circular geometry to act as full solid so its impenetrable and the arms wont go through but instead get squashed. Anyone have any suggestions.