### Interface conditions with normal unit vectors

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Hi everyone!!!

I come to you for asking if there is anyway for implementing in FEniCs an interface condition of the form

$_{F^c\left(N^{^c}\right)n_{j^{^{\alpha}}}-F^{^{\alpha}}\left(N^{^{\alpha}}\right)n_{j^{^{\alpha}}}=f_{kl}n_j^{^{\alpha}}}$

Where, N is the searched function, and F^c and F^a are known and different functions in two regions i.e. an sphere inside a cube. And $n$

Thanks,

Jorge.

I come to you for asking if there is anyway for implementing in FEniCs an interface condition of the form

$_{F^c\left(N^{^c}\right)n_{j^{^{\alpha}}}-F^{^{\alpha}}\left(N^{^{\alpha}}\right)n_{j^{^{\alpha}}}=f_{kl}n_j^{^{\alpha}}}$

_{Fc(Nc)njα−Fα(Nα)njα=ƒ klnjα}on $\Gamma$Γ when solving a PDE.Where, N is the searched function, and F^c and F^a are known and different functions in two regions i.e. an sphere inside a cube. And $n$

`n`is a normal unit vectorThanks,

Jorge.

Community: FEniCS Project

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ƒ_{kl}? what is the PDE? Is the interface known? This looks like a nonlinear problem (I imagine F depends nonlinearly of N)