[Nek5000-users] Question about method & error

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

Hi Frank,

There are several apps driving it.  At present, I think that the
version is slightly out of step w/ our current repo - but not far.
The original developer has moved on to a university and to other
projects, so has not been pushing it since September (though I used
it extensively in January for some tests).  I've been holding off
on pushing it further till I had more support.

If your shared interface has elements on either side that are
conforming it might also be possible to study the Marangoni
problem in the std. nek if you use the ALE formulation ---
If you use a fixed interface we would suffer from the fact
that the pressure would have a nullspace of dimension 2
since pressure on either side of the (rigid) interface
would be determined up to a constant.   This would be 
difficult for our solvers given that we've designed them
only to handle the case of an at-most one-dimensional nullspace.

How complex is your domain?

Paul

On Wed, 7 Apr 2010, nek5000-users at lists.mcs.anl.gov wrote:

> On Tue, 2010-04-06 at 12:58 +0200, nek5000-users at lists.mcs.anl.gov
wrote:
> NEK-NEK stands for the coupling of two independent NEK instances. Unfortunately this is still an experimental feature but if you're interested in we can set up something for you.

Hello Stefan,

If I can make up a grid, is getting an instance of the NEK-NEK
capability working something you are willing to work with me to get
running?  Couple of questions: How experimental is the NEK-NEK
capability?  And is there a specific application or class of problems
driving it?

Cheers,
Frank

> 
> Stefan
> 
> 
> On Apr 6, 2010, at 12:54 PM, nek5000-users at lists.mcs.anl.gov wrote:
> 
> > Hello Stefan,
> > 
> > Thanks, that fixed it.  By the way, (from your earlier email) what does
> > NEK-NEK stand for?
> > 
> > Cheers,
> > Frank
> > 
> > On Tue, 2010-04-06 at 12:45 +0200, nek5000-users at lists.mcs.anl.gov
> > wrote:
> >> Hi Frank,
> >> 
> >> On Apr 6, 2010, at 12:32 PM, nek5000-users at lists.mcs.anl.gov wrote:
> >>> Am I correct in understanding that all components of velocity are
> >>> stored at the same locations (the Gauss–Lobatto–Legendre points), while
> >>> the pressure is located at the Gauss–Legendre points?  This being in
> >>> contrast to a MAC type staggered grid, where each velocity component
> >>> resides at different spatial locations.
> >>> 
> >> Yes that's correct!  In NEK two different methods are implemented:
> >> 
> >> PN/PN: (v,p) are defined on the GLL points
> >> PN/PN-2: v is defined on the GLL points and p on the GL points
> >> 
> >> 
> >>> VisIt could not read from the file
> >>> "/home/fmuldoo/nek5_svn/examples/turbChannel-1/turbChannel0.f0001".
> >>> 
> >>> The generated error message was:
> >>> 
> >>> There was an error
> >>> opening /home/fmuldoo/nek5_svn/examples/turbChannel-1/turbChannel0.f0001. It may be an invalid file.  VisIt tried using the following file format readers to open the file: Silo
> >>> 
> >>> When using the following metadata file:
> >>> 
> >>> NEK5000
> >>> version: 1.0
> >>> filetemplate:  turbChannel0.f%04d
> >>> firsttimestep: 1
> >>> numtimesteps: 1
> >> It seems like you're using a wrong filetemplate. Please try again with:
> >> filetemplate:  turbChannel%01d.f%04d
> >> 
> >> 
> >> #Stefan
> >> 
> >> _______________________________________________
> >> 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 (Technical University of Vienna)
> > 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
> > 
> > _______________________________________________
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> > Nek5000-users at lists.mcs.anl.gov
> > https://lists.mcs.anl.gov/mailman/listinfo/nek5000-users
> 
> _______________________________________________
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> Nek5000-users at lists.mcs.anl.gov
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-- 
Frank Herbert Muldoon, Ph.D. Mechanical Engineering
Technische Universität Wien (Technical University of Vienna)
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

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