I am trying to model ice (non-Newtonian laminar) flow under martian conditions using a flow law used in the literature for non-terrestrial ice modeling. It is essentially a power law form but combining multiple modes of deformation that use different exponents in the power law. This does not fit into any of the pre-defined models available and it appears that in version 5.5 it is no longer possible to use user-defined functions for flow laws. Am I missing something or do I need to go back to 5.4 to do this?
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