I want to simulate a coil with a force applied to the inside pushing out on the coil-ie in the radial direction. I think that the correct fixture is "On Cylindrical Faces" using the face highlighted and with "Radial" selected under Translations. Unfortunately I get the error "Excessive displacements were calculated in the model". Any help? I got it working with a cylinder but not with the coil. Also, I understand that the radial box (under Translations) will allow the coil to expand radially, but I'm not sure why you need to enter a value? It doesn't seem to work whichever value I choose.