> 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.

Timo Heister

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