dolfin team mailing list archive

[Murtazo Nazarov <murtazo@xxxxxxxxxxx>]

Anders Logg wrote:
> On Tue, Jan 15, 2008 at 08:33:07AM +0100, Murtazo Nazarov wrote:
>   
> > > Related question for both incompressible flow and elasticity
> > > problems.  Suppose I have a plane of symmetry that will allow me to
> > > reduce my computational domain.  If
> > >
> > > \sigma_ij
> > >
> > > is the relevant stress tensor, then I will have that
> > >
> > > t^k_i \sigma_ij n_j = 0
> > >       
> > Ones you have tangential and normal vectors, you can include this as a
> > boundary term to the ffc form?
> >     
>
> FFC/DOLFIN only have built-in facet normals (FacetNormal). There is no
> FacetTangent but it would be easy to add (if we just define what we
> mean by the tangents on a face of a tetrahedron).
>
>   
The normals and tangents I mean should be on the nodes not on sides of 
element. This will also be available in UNICORN.

/murtazo