ffc team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Thu, Apr 16, 2009 at 10:42:08AM -0400, Shawn Walker wrote:
> Hello.
> 
> I was wondering how do you have finite element spaces that only live on 
> the boundary?  Say I want to solve a mixed form for Laplace's equation. 
> And, I would like to set the normal flux on the boundary by using a 
> Lagrange multiplier that is only defined on the boundary.  Is there an 
> example on this already?

Is it not enough to add a boundary integral? Something like

  lmbda*(dot(sigma, n) - g)*ds

-- 
Anders

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