On 3/17/20 8:34 AM, Ahmad Shahba wrote:
*_My question:_*
Is this behavior expected? Or am I doing something wrong or perhaps my
understanding of this subject is flawed?
I prepared a small code to demonstrate this behavior. Thanks in advance for
your help and sorry for this long description of the problem.
The AffineConstraints class needs to know about constraints on all *locally
relevant* DoFs, not just the locally owned ones. So I would suspect (without
having tried) that when you do
dealii::AffineConstraints<double> constraints(locallyRelevantIndices);
if (idProcess == 0) {
constraints.add_lines(std::set<unsigned>({0, 1, 2, 3}));
constraints.add_entry(0, 4, 1.0);
constraints.add_entry(1, 5, 1.0);
} else {
constraints.add_lines(std::set<unsigned>({4, 6, 7}));
constraints.set_inhomogeneity(4, 0.05);
}
That this is not enough -- you need to also add the constraints for the other
unknowns among the locally relevant ones.
Best
W.
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Wolfgang Bangerth email: [email protected]
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