dolfin team mailing list archive

["Garth N. Wells" <gnw20@xxxxxxxxx>]

Anders Logg wrote:
> On Thu, Mar 12, 2009 at 09:12:48PM +0000, Garth N. Wells wrote:
> > DOLFIN wrote:
> > > One or more new changesets pushed to the primary dolfin repository.
> > > A short summary of the last three changesets is included below.
> > >
> > > changeset:   5860:54b6f356ba99be68a5caa08fa66031fc1572ac0e
> > > tag:         tip
> > > user:        "Johan Hake <hake@xxxxxxxxx>"
> > > date:        Thu Mar 12 22:00:22 2009 +0100
> > > files:       dolfin/function/SpecialFunctions.cpp dolfin/function/SpecialFunctions.h site-packages/dolfin/specialfunctions.py
> > > description:
> > > Added a SUPGStablizer built in function
> > >   sigma - diffusion coeffisient
> > >   a     - advective field
> > >   s     - SUPGStabilizer(a,sigma)
> > >   v     - TestFunction
> > >
> > >   # SUPG stabilized TestFunction
> > >   v = v + dot(s,grad(v))
> > >
> > >   (Will add a demo later)
> > Some of this is pretty specific, e.g. tau = 1/std::tanh(PE)-1/PE. I'm 
> > not convinced that it should be in SpecialFunctions (very worthwhile in 
> > a demo though which users can mimic).
> >
> > Garth
>
> I think it could be useful to have. We could also add other optional
> stabilizers. It's in SpecialFunctions after all. It's a matter of
> taste how special the functions can be.

Part of my motivation is that I have a number of SUPG stabilised solvers 
and I haven't felt the need to move parts into SpecialFunctions, in 
contrast to upwinding at facets which I like in SpecialFunctions.

Garth

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