In fact, this will be a problem for me. Capillary law is one specific
case and has been computed, if I get it right, as a separate
constitutive relationship. However, there are laws where fn can be
zero and a stiffness has to be consider since the contact still
remains as the contact area is finite.
Are you really sure you will get _exactly_ force=0 on an existing
contact? The only way I think is to write fn=0, otherwise it will always
be 0.0000... If one day, no luck, one existing contact has zero force,
you will just miss just one contact in the full packing. Really not a
big deal. I would not worry about that.
Bruno
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