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How to constraint the tangential gradient on a boundary in FEniCS?

Not really a solution for FeniCS, but this is how I would solve this problem in GetFEM ...
Konstantinos's user avatar
1 vote
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How to obtain the transfer function between boundary condition and point of wave equation?

In order to calculate the transfer function one can assume that $f(t) = e^{s\,t}$, with $s$ representing the Laplace variable. Using separation of variables $u(t,x) = T(t)\,X(x)$ in $(1)$ yields $$ \...
fibonatic's user avatar
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