On 5/1/19 5:58 AM, 'Maxi Miller' via deal.II User Group wrote:
>
> I don't know NOX, but is it using an update that it adds to the
> solution in
> each step? If so, you need to have the correct boundary conditions
> in the
> initial guess already. What happens if you only allow NOX to do zero
> or one
> iterations?
>
> Zero iterations is not allowed, the first iteration already goes way off
> (expected highest value: 1, calculated value: 1e6), regardless if I set
> boundary conditions already to the solution vector I feed to NOX, or if
> I set the boundary conditions during the assembly of the right hand side.
I don't know NOX at all, so I'm afraid there is little else I can to
help you with this. As always, make the problem small and easy (e.g.,
try to find a constant solution where the nonlinear solver only has to
find *which* constant value you are looking for).
Best
W.
--
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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