ffc team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Mon, May 08, 2006 at 07:56:45AM +0200, Garth N. Wells wrote:
> On Sun, 2006-05-07 at 23:03 +0200, Anders Logg wrote:
> > I haven't tried, and I also haven't updated the additional formats,
> > including PyDOLFIN.
> > 
> > I plan to extend the Poisson solver module with general Robin
> > boundary conditions and try to gain some confidence that everything
> > works. I looked over your additions and everything seems to be in
> > order.
> > 
> 
> Do you plan to introduce the normal vector to the domain in FFC, or will
> you treat it as a function?

I would like to treat it as a Function (like we do with MeshSize), but
since it's discontinuous across the facets, a special solution might be
needed.

> At the moment, functions on boundaries are defined suing the trace of
> the basis functions for a cell. It would be useful and more general to
> define functions using a basis defined on the facet.  Would this be
> difficult? Functions could, for example, be discontinuous from one facet
> to the next (in which case the normal vector could be treated as a
> function).

I haven't thought about this in too much detail. Are there other
possibly discontinuous functions than the normal that one would like
to specify on the boundary? If so, we should add general support for
that and have the normal as a special predefined function. We could
probably do something like overloading eval() in Function with
something that takes facet as an extra argument.

/Anders


> Garth   
> 
> > /Anders
> > 
> > 	On Sun, May 07, 2006 at 06:58:48PM +0200, Garth N. Wells wrote:
> > > Great! Does it work with the "-f blas" option?
> > > 
> > > Garth
> > > 
> > > On Sun, 2006-05-07 at 15:57 +0200, FFC wrote:
> > > > One or more new changesets pushed to the primary FFC repository.
> > > > A short summary of the last three changesets is included below.
> > > > 
> > > > changeset:   387:7e888efabfdc4987f08c5602f570a92a2dfb3747
> > > > tag:         tip
> > > > user:        "Anders Logg <logg@xxxxxxxxx>"
> > > > date:        Sun May  7 15:55:37 2006 +0200
> > > > files:       ChangeLog src/demo/Poisson.form src/ffc/compiler/compiler.py src/ffc/compiler/elementtensor.py src/ffc/compiler/finiteelement.py src/ffc/compiler/form.py src/ffc/compiler/mixedelement.py src/ffc/compiler/monomialintegration.py src/ffc/compiler/projection.py src/ffc/compiler/referencetensor.py src/ffc/format/dolfin.py src/reference/Elasticity.h src/reference/EnergyNorm.h src/reference/Heat.h src/reference/Mass.h src/reference/NavierStokes.h src/reference/NeumannProblem.h src/reference/Optimization.h src/reference/Poisson.h src/reference/PoissonSystem.h src/reference/Projection.h src/reference/Stokes.h src/reference/TensorWeightedPoisson.h
> > > > description:
> > > > Add support for boundary integrals.
> > > > 
> > > > Changes pulled from Garth's tree with some additional updates,
> > > > mainly fixes for mixed elements and projections to make all
> > > > tests in src/reference compile correctly.
> > > > 
> > > > 
> > > > changeset:   386:45a447e390950e45145bf0e3fb4092104505ee40
> > > > user:        "Garth N. Wells <g.n.wells@xxxxxxxxxx>"
> > > > date:        Thu May  4 02:41:50 2006 +0200
> > > > files:       src/demo/Poisson.form src/ffc/format/dolfin.py
> > > > description:
> > > > Add missing "break;" in DOLFIN output.
> > > > 
> > > > 
> > > > changeset:   385:8301d56d241aacf9e7ab15921710ff6ca83d5ba4
> > > > user:        "Garth N. Wells <g.n.wells@xxxxxxxxxx>"
> > > > date:        Tue May  2 19:44:01 2006 +0200
> > > > files:       src/ffc/compiler/compiler.py src/ffc/compiler/elementtensor.py src/ffc/format/dolfin.py
> > > > description:
> > > > Deal with terms in geometry tensor for boundaries.
> > > > 
> > > > 
> > > > ----------------------------------------------------
> > > > For more details, visit http://www.fenics.org/hg/ffc
> > > > 
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