[Nek5000-users] solver tolerances and norm of residual

[nek5000-users at lists.mcs.anl.gov]

A quick look of the *rea file did not bring up anything.  I recall an
issue with periodic BC's, following is an email from one of the
developers:


Hi Frank,

Yes -- we currently don't support periodic bcs for
anything smaller than a 3 x 3 x 3 array of elements.

There's a technical reason for this --- it can be
circumvented if really needed, but it would not
fit within the std. context.

Sorry about that.

Paul

On Tue, 2010-11-16 at 12:56 -0500, nek5000-users at lists.mcs.anl.gov
wrote:
> Hi Frank,
> 
> The rea file has been attached.
> Meanwhile I'll check the BC...
> 
> Thanks
> 
> > Hello Alex,
> >
> > I looked through your files & didn't see anything amiss (by the way, it
> > would be best to post your *.rea file).  Since it blows up on the first
> > attempt to solve for pressure, perhaps the BC's don't satisfy
> > conservation of mass?
> >
> > Cheers,
> > Frank
> >
> >
> >
> > On Tue, 2010-11-16 at 11:40 -0500, nek5000-users at lists.mcs.anl.gov
> > wrote:
> >
> >> Hi Nek users,
> >>
> >> I am new in using Nek5. I have succesfully simualted the lid-driven
> >> flow,
> >> rayleigh-bénard in a square cavity and laminar poiseuille flow. All of
> >> them were 2d cases. I though it would be straightforward to move from 2D
> >> to 3D simualtions but I have not been able to run a 3D poiseuille
> >> channel.
> >> I am obtaining an error on Helmoltz solver even in the first iteration.
> >>
> >> Please, find output, usr and box files attached.
> >> Thanks in advance.
> >>
> >> ..........................................
> >>            Alex Fabregat
> >>         Post-doctoral fellow
> >>         University of Ottawa
> >> Department of Mechanical Engineering
> >> _______________________________________________
> >> Nek5000-users mailing list
> >> Nek5000-users at lists.mcs.anl.gov
> >> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
> >
> > --
> > Frank Herbert Muldoon, Ph.D. Mechanical Engineering
> > Technische Universität Wien (Vienna University of Technology)
> > Inst. f. Strömungsmechanik und Wärmeübertragung (Institute of Fluid
> > Mechanics and Heat Transfer)
> > Resselgasse 3
> > 1040 Wien
> > Tel: +4315880132232
> > Fax: +4315880132299
> > Cell:+436765203470
> > fmuldoo (skype)
> > http://tetra.fluid.tuwien.ac.at/fmuldoo/public_html/webpage/frank-muldoon.html
> > _______________________________________________
> > Nek5000-users mailing list
> > Nek5000-users at lists.mcs.anl.gov
> > https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
> >
> 
> 
> ..........................................
>            Alex Fabregat
>         Post-doctoral fellow
>         University of Ottawa
> Department of Mechanical Engineering
> _______________________________________________
> Nek5000-users mailing list
> Nek5000-users at lists.mcs.anl.gov
> https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
-- 
Frank Herbert Muldoon, Ph.D. Mechanical Engineering
Technische Universität Wien (Vienna University of Technology)
Inst. f. Strömungsmechanik und Wärmeübertragung (Institute of Fluid
Mechanics and Heat Transfer)
Resselgasse 3
1040 Wien
Tel: +4315880132232
Fax: +4315880132299 
Cell:+436765203470
fmuldoo (skype)
http://tetra.fluid.tuwien.ac.at/fmuldoo/public_html/webpage/frank-muldoon.html