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This maybe raises more questions than it answers, but here is what I think one should do. Lets assume that at the boundary point p, the velocity u is defined as $$ u(p) = u_1 \phi_k(p) + u_2 \phi_{k+1} (p), $$ where $$\phi_k = \begin{bmatrix} \phi \\ 0 \end{bmatrix}, \quad \phi_{k+1} = \begin{bmatrix} 0 \\ \phi \end{bmatrix} $$ are corresponding nodal basis ...

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