On 10/20/25 16:10, Arthur Bawin wrote:
If the coupling is enforced by simply modifying the rows of the v dofs
on the cylinder, then u is unaffected by the coupling as expected, and
we get v = C*u.
You assumption is that the relationships the AffineConstraints class
describes, namely
v = C*u,
creates a primary degree of freedom u whose value is what it is, and a
dependent degree of freedom v whose value is then computed from u. But that's
not what the class does. It represents constraints that you should think have
the form
v - C*u = 0
in which all degrees of freedom are logically considered having the same
category.
I put this into words here:
https://github.com/dealii/dealii/pull/18945
Best
W.
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