Hi evryone. I'm new in comsol. I'm a student of master degree .. option Physics and radiation technologies. I want to simulate the thermal stress of fuel rod in triga nuclear reactor. I have a little problem with materials overlapping in the red cercles (image attached). its dosen't make sense becauce those solid materials are tough .. I want to simulate the thermal stress in those materials and I have a helium gas between them.
so I need your help. if something I should know please tell me.
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Materials Overlapping
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