I will see about sending you a patch to ex9 demonstrating SUPG for a scalar problem.  John is right, for systems it gets a little too complicated for an example...

-Ben



----- Original Message -----
From: libmesh-devel-bounces@lists.sourceforge.net <libmesh-devel-bounces@lists.sourceforge.net>
To: Adam C Powell IV <hazelsct@debian.org>
Cc: libmesh-devel@lists.sourceforge.net <libmesh-devel@lists.sourceforge.net>
Sent: Tue Aug 12 17:19:46 2008
Subject: Re: [Libmesh-devel] Example code with upwinding

On Tue, Aug 12, 2008 at 5:15 PM, Adam C Powell IV <hazelsct@debian.org> wrote:
> [Sorry to post a -users message to -devel; I can't post to -users.]

Interesting.  I can see about adding you to the list, if you want?  Or
is it just an issue with your domain?

> I have a very high-Peclet number advection-diffusion problem, and would
> like to use upwind differencing for the advection terms to reduce
> numerical diffusion.  I don't see this in any of the libmesh examples,
> but the online gallery shows some nice examples which might have used
> it.  (Also the deal.II FEA library has an example or two which uses it.)

AFAIK, upwind differencing *adds* numerical diffusion, to improve stability.

> Is any libMesh code available with upwinding?

I have some code which uses SUPG but it's not simple enough to be an
example.  Nothing using simple upwinding though.  Was this in 1D, 2D,
3D?  Maybe the dealII example could be co-opted to work in libmesh?

--
John

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