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[Johan Hake <question215444@xxxxxxxxxxxxxxxxxxxxx>]

Question #215444 on UFL changed:
https://answers.launchpad.net/ufl/+question/215444

    Status: Open => Answered

Johan Hake proposed the following answer:
Have you read the docstring of DirichletBC?

Johan


On 11/29/2012 08:51 AM, Huadong GAO wrote:
> Question #215444 on UFL changed:
> https://answers.launchpad.net/ufl/+question/215444
> 
>     Status: Answered => Open
> 
> Huadong GAO is still having a problem:
> Thanks Johan again.
> 
> I just want to know how does FEniCS define the value of the node at
> boundary edge, say,
> 
> for the UnitCircle partition the following element is near the boudary,
> we can assume edge 1-2-3 is the boundary, and when applying Dirichlet boundary conditions,  we have to know the values of the equation at  nodes 1, 2 and 3,
>  
> node 1 and node 3 lay on the boundary so we can directly use these values, but the value of node2 is difficult to get, as node 2 is not on the boundary exactly, 
> 
> my question is how FEniCS treat this.
>  
> 
> 1         2              3
> o--------o-----------o
>  \                       /
>    \                   /
>     o  4           o 5
>        \           /
>          \       /   
>            \   /
>              o  6
>

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