dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Thu, Mar 12, 2009 at 09:45:41PM +0000, Garth N. Wells wrote:
> 
> 
> 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

I don't mind either way.

-- 
Anders

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