> Does the order in which I apply the nonzero and zero constraints matter?
These are two independent objects, so no.
> Currently I apply the inlet and then the no-slip in the nonzero_constraints,
> thus the bottom and top wall appear after the inlet. Afterward the cylinder
> is put in the zero constraints.
I don't understand. You need boundary conditions in
nonzero_constraints and zero_constraints for all boundaries. The
reason for these two sets is that one is used for the initial solve,
while the second one is used for the Newton updates.
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