On 10/05/2017 08:52 AM, 'Maxi Miller' via deal.II User Group wrote:
Having a nonlinear, time-dependent heat equation, I tried to implement
it as in step-15 and in step-33. Everytime my l2-value goes below a
certain threshold,
The l2 norm of what? The solution? The residual?
I make one step in time (or I refine the mesh). At
the beginning the L2-value goes down rather fast, but later it slows
down, and even stops going lower.
Do you have theoretical evidence that it *should* decrease to zero? If,
for example, you just look at the L2 norm of the solution, then there is
no reason to believe that it should converge to zero -- it should just
decrease to the L2 norm of the exact solution.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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