First of all sorry for the long question. I could not find a smaller MWE. If someone reads it I would be really appreciate it. I tried to explain it as much as I could. The Physical problem Let \mathcal{R} denote the rectangular domain: \mathcal{R}:=\left\lbrace\left(x,y\right)\in\mathbb{R}^2, \;…

You should choose different markers for the front and back of your domain, e.g. 1 and 2. In your current code, both the front and sides of your domain are marked as 0 (because the default value of boundary_markers is 0), so the homogeneous Neumann condition is not enforced anywhere.

Solution does not fulfil homogeneous Neumann conditions

MPenaR June 9, 2022, 1:55pm 3

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Captura desde 2022-06-09 15-55-27

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Solution does not fulfil homogeneous Neumann conditions

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