Erik Kostson
Ansys Employee

This is a duplicate - please refrain from creating duplicate posts - this one will be closed and deleted. USe the previous one for further discussion (I have already replied on the previous one):
Closing this, so please do not continue here, but do it in the link above:
All the best

As we saw,there is some penetration (0.01378 mm) in the contact as seen below. This is resolved during solution thus giving a reaction (parts are pushed away from each other to resolve the penetration)- try to move the cylinder away from the disc so they do not overlap and there is no penetration and there should not be any reaction (this is a quick test to show that it is the solution of the penetration that gives rise to the reaction force).