POLYDATA - availibility of velocity magnitude for PMAT functions or UDF

For specific appplications, one may need a slipping law that differs from the available ones. How can one define a UDF or a PMAT function on the basis of the velocity magnitude?
Considering the velocity magnitude is relevant for the definition of a slipping law, since one already knows that the component perpendicular to the boundary vanishes. Through the mechanism of UDF, it is possible to define the velocity magnitude. Of course, calculation involving UDF can be slower than those involving PMAT functions. It is however good to remember that slipping law is defined on the boundary, and not in the bulk of the fluid.
A useful hint: in case of convergence difficulty associated to the UDF, the user can invoke the keyword FULLEVALUDF for the POLYFLOW calculation.

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