On Sun, 25 Oct 2009, Yujie wrote:
Thanks, Roy. It means that one needs to judge which triangle (which three
vertices) of an element is on boundary for Neumann or Robin type boundary
conditions?
You need to know which side is on the boundary (elem->side(s) == NULL
in libMesh) for every boundary condition, but you don't need to
explicitly know which nodes are on the side for any boundary
conditions.
---
Roy
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