Lee:
I want to set 2 constraints (P = 0 and \delta P = 0) on the scalar pressure
variable on a single point (4, 0.1) at the outlet. Here, \delta P is the
Newton's iteration update value for P.
I used "constraints_hp_nonzero" to interpolate the real boundary values for my
physical problem and "constraints_newton_boundary" to interpolate the Newton
updates values on the boundaries.
I found that one can only set one type of constraint on a singel index.
Therefore, the following snippet code would generate errors, since I was
trying to set 2 different constraints simultaneously on the same dof index.
What specifically is the error you get?
I must admit that I don't quite seem to understand what it is you are doing.
If you have a nonlinear (Newton) iteration, you are only solving for either P
or delta P at any given time. Specifically, I imagine that you are first
interpolating an initial guess (where you should apply the constraint for P)
and then you are only solving for updates (where you should apply the
constraint for delta P). You are not (or you *should* not be) applying two
constraints at the same time for the same DoF, but these two constraints apply
to entirely separate variables. In other words, without understanding what
your overall algorithm is, I can't...
If I want to successfully impose the 2 constraints: P=0 and delta P=0 on
point (4,0.1), does it exist a better way? Could you kindly give me some hints?
...quite understand what it is you are doing and why you are getting an error.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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