### how to write the code

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4 weeks ago by
the boundary condition   $u$u  X $n$n =0
Community: FEniCS Project

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4 weeks ago by
Since your question provides no background as to what you want to achieve and you're not even trying to define the quantities you introduce, I'll just assume that this boundary condition comes up naturally in the weak formulation of your problem (I'm thinking Maxwell equations and vector potential?). If that is the case, you'll want to include the boundary integral
cross(u,n)*ds​
n = FacetNormal(mesh)​

is the outward unit normal.

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