On Tue, Sep 11, 2012 at 11:44 AM, Roy Stogner <royst...@ices.utexas.edu>wrote:
>
> On Tue, 11 Sep 2012, Derek Gaston wrote:
>
> > One of our users is looking for the ability to do Periodic BCs... but
> where instead of have _equality_ on either side of the periodic boundary you
> > instead have a constant offset.
> > So if u_i is periodic with u_j you would then have the constraint that
> u_j = u_i + c ... where c is that specified offset.
> >
> > What's really tricky is that they want a different constant value for
> each variable.
> >
> > Anyone see a way to make that happen?
>
> It'd actually be pretty easy now that the heterogenous constraints are
> in - we'd just want to add "offset" values to the PeriodicBoundary
> class and respect that when constructing the constraint equations.
>
> The main problem is: isn't the new PBC code still failing some of your
> tests? Last I heard, John still had a MOOSE regression test breaking
> but hadn't been able to distill it down into a libMesh-only failure
> case to send me.
>
So we do still have one test that's failing. John coded up the example in
pure libMesh code and it works so the problem doesn't appear to be on your
end. However there are a few differences in the way MOOSE solves it and
Johns example: for one we solve every problem with a transient nonlinear
system using JFNK which is of course different from the simple example John
has already coded up using a linear system. We were down to looking at
differences in the system matrix to try to figure out why things were
different, but will need more time to narrow down the issue.
I think we've decided that we are going to put this one problem to the side
for now since it has been a hefty time sink and move forward until we have
some more downtime. The remaining PBCs issues appear to be solved using
your latest (uncommitted?) patch. We are going to work on updating all of
our users to the current head of libMesh barring any other issues. Thanks
for working on this for us!
Cody
> ---
> Roy
>
>
> ------------------------------------------------------------------------------
> Live Security Virtual Conference
> Exclusive live event will cover all the ways today's security and
> threat landscape has changed and how IT managers can respond. Discussions
> will include endpoint security, mobile security and the latest in malware
> threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
> _______________________________________________
> Libmesh-devel mailing list
> Libmesh-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/libmesh-devel
>
------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
_______________________________________________
Libmesh-devel mailing list
Libmesh-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/libmesh-devel
