On 09/25/2017 01:25 PM, 'Maxi Miller' via deal.II User Group wrote:
I do not understand the reason why that happens. Is it a mathematical
problem? Or rather a problem in my code? Afaik the gradients should not
depend on the offset, thus I do not know where to look for the problem here.
Did you adjust the boundary values in the same way as the initial
values? Because if you don't, your initial guess will have a sharp
boundary layer where it drops from OFFSET to zero, and that leads to a
very large non-linearity.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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