Dirichlet BC for boundary not aligned with any axis

variational formulation
1

Hi,

I am doing fluid computation and wanna use DirichletBC for the velocity. The only thing is I have a boundary that is aligned with any axis. So the simple Dirichlet BC is then turned into a linear constraint on the boundary like \vec{n}\cdot\vec{v}=n_xv_x+n_yv_y+n_zv_z=0. I think there might be people who’ve already encountered this question as it’s quite usual in reality. If anyone could share what you think, I’d appreciate that.

Thanks,
Victor

2

As far as I know this is not achievable with DirichletBC.
You should rather realize the boundary condition weakly.

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