Hi Sebastian,

> Unless something is wrong in my understanding I believe that if
> VectorTools::create_boundary_right_hand_side is called with the
> default argument for the boundary_indicators then it does nothing,

that is correct and probably not what is expected from the function.
At least step-11 does not what it says it does right now.

> I wonder why the solution still
> "converges"???

Good question, maybe someone else can jump in here? The errors are a
little smaller after fixing this error.

> The issue is quite simple to fix, but it requires a design decision:
> either remove the default argument or modify the code so that if an
> empty set is passed then all boundary faces are assumed.

I checked in that an empty set assumes all boundary faces.

Can you test that it works as expected now, please?

-- 
Timo Heister
http://www.math.tamu.edu/~heister/
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