dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Thu, Feb 07, 2008 at 05:43:13PM +0100, Marie Rognes wrote:
> Anders Logg wrote:
> > On Thu, Feb 07, 2008 at 05:07:46PM +0100, Marie Rognes wrote:
> >   
> >> Hi,
> >>
> >> I would like to construct a vector-valued finite element space where the 
> >> components may be related to each other on the boundary.
> >>
> >> Example:
> >>
> >>     Let P1 be piecewise linears on K.
> >>     I want the subspace {(u, v) \in P1 x P1 such that u = v on the 
> >> boundary of K.}
> >>
> >> Is this possible in DOLFIN today?
> >>     
> >
> > Not that I know. Generally, we can't handle constraints.
> >
> >   
> 
> Darn. How hard do you think it would be to set-up?

I don't know. There was some discussion a month back on setting
no-slip constraints (zero normal component on boundaries) which is
similar. I think the conclusion was that we didn't find a general
solution. (But most likely there is one...)

-- 
Anders