Default value for Penetration Convergence Tolerance and Normal Stiffness of a contact?
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For all the contacts (Non-Linear as well as Linear), I see an option of penetration convergence tolerance and also normal stiffness of the contact. I want to know the default values used by the solver for each of these, and for each of the contact.
I am asking this because sometimes, my solution is unable to converge at the contact region and I want to play with the Penetration Convergence Tolerance and Normal Stiffness values in order to make it converge. However, if I randomly input a very high or very low value, then the solution results might not be accurate at all.
Moreover, does the penetration convergence tolerance also needs to be met for the solution to converge at the contact region even if I am using a linear contact?
yes I often played with the different factors for the normal stiffness. For penetration some formulation accept penetration as the increased Lagrange and pure penalty formulation. Others do not accept penetration as Normal Lagrange. So in case you choose for example a Normal Lagrange formulation you will not have to enter a value for penetration.
Let me show you the pictures below to illustrate what I am saying:
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