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Dear all,

I would like to have some clarification on how the Robin Boundary Conditions work on Nektar++. In particular, I would like to know how the normal derivative is calculated on a curved surface, where the normal to the surface is in the radial direction.

Please find attached notes.pdf, where I try to explain myself a bit better. I hope my question it is clear enough.

Thank you for your help.

Kind regards,

Silvia