Dear Stéphane,
thank you for your advise!
As I understand, your penalty term is forcing the flow field "u" only to
be parallel to the surface of obstacle, but
does not prescribe a specific slip, "u = *slip* on [ref] ", where *slip *is
some function.
One, in principle, can also penalize the variational formula in order to
impose
u = *slip
*on the boundary. Is it also possible to impose this condition rigidly,
as a boundary
condition?
Thank you in advance, and
the best regards,
Mykola.
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