Hello everyone, I am trying implement a condition (in Fenics-Dolfin 2019.1.0 version) to see if and when the solution reaches a steady state. In order to achieve this I am computing the norm of the difference in the solutions (which are obtained by LUSolver) of the current and previous time steps. …

You need to create an additional Function object. The statement u = old_u assigns the Python name u to point to the same underlying object as the Python name old_u. Therefore, in your code, there is only one Function object, and of course the residual between a function and itself will always be z…

Computing norm of solution obtained by LUSolver

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dokken November 2, 2022, 9:22pm 10

See for instance this post The new DOLFINx solver is now recommended over DOLFIN
and
https://fenicsproject.org/roadmap/

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Computing norm of solution obtained by LUSolver

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