dolfin team mailing list archive

[Karin Kraft <karin.kraft@xxxxxxxxxxx>]

Hello,

We started to look at the boundary conditions yesterday. Do you have any
plans on how to do it? I have started to implement a mapping that takes
a triangle in 3D to a unit triangle in 2D but I am not sure of the
consequences for the rest of the code so I am happy for some
suggestions.

/Karin

On Wed, 2005-06-08 at 08:53 -0500, Anders Logg wrote:
> Hi Karin!
> 
> The only thing we have right now is Dirichlet boundary conditions or
> homogeneous Neumann boundary conditions. To do anything else, we need
> to be able to compute integrals over the boundary and there is nobut I am not sure of the consequences for the rest of th
> support for this in yet in FFC or DOLFIN.
> 
> It won't be very difficult to add, once I find time to do it. If
> someone else wants to try, you are more than welcome. It would involve
> modifiying both FFC and DOLFIN. Tell me if you want some detailed
> pointers.
> 
> In the meantime, it might be possible to cheat by approximating a
> boundary integral with an integral over the domain, using a function
> that is zero everywhere except on elements close to the boundary,
> where the function takes the value ds/dx (length of boundary edge
> divided by area of triangle for a triangular mesh).
> 
> /Anders
> 
> On Wed, Jun 08, 2005 at 03:06:29PM +0200, Karin Kraft wrote:
> 
> > Hello,
> > 
> > I am wondering how the support for boundary terms is in Dolfin. I would
> > like to use absorbing boundary conditions. Johan Jansson said that at
> > the moment it is not working. Is somebody working on it? Otherwise, how
> > difficult is it to add? 
> > 
> > Regards,
> > Karin Kraft
> > 
> > 
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>