On 10/19/2016 05:55 PM, Hamed Babaei wrote:
Although the problem has been resolved by this trick but I don't know why I
need to consider different convergence criteria for CG solver in the first
newton iteration.
What is the norm of the first right hand side? You now set the tolerance in
the first iteration to a fixed value of 1e-16, but how does this compare to
the previous value of 1e-12*system_rhs.l2_norm()?
In addition, the CG solver still doesn't converge with PreconditionAMG but it
works with PreconditionJacobi.
That still seems wrong to me. As I mentioned in a previous email, you ought to
make sure that the matrix you build is the matrix you *want* to build.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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