How to set Dirichlet BC at certain vertex

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1

Hi all
I am solving lid driven cavity

I want to set a pressure value of zero at the bottom right corner.

I already was able to get the vertex number at that point. But how can I set Dirichlet BC at certain vertex ?

Thanks in advance

2

Hi,
you have to set the freedofs bitarray at the dof number to False. As the first H1 dofs are exactly the vertex dofs it should be as easy as

fes.FreeDofs()[vertex_num] = False