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As described in [

1], Dirichlet conditions for the velocity are implemented by setting the nodal value
of the normal velocity component or by linear interpolation for the tangential velocity components.
The homogeneous boundary Neumann conditions for the pressure are discretized by, e.g.

In case of convex edges some special treatment is required. Consider the situation shown in Figure

.

If

denotes the face between the cells

and

and

the face between
the cells

and

, then the homogeneous Neumann conditions are discretized by

Martin Engel
2004-03-15