[Nek5000-users] Periodic BC

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

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

PS - the technical reason has to do with the fact
      that a 2 element mesh, periodic in x, would
      have global vertices numbered


      1-----2-----1


      along one of the edges of the domain.  Nek
      would not be able to understand that the 1-2
      edge is not shared with the 2-1 edge...



On Sat, 1 May 2010, nek5000-users at lists.mcs.anl.gov wrote:

> Hello all,
>
> I have a real simple mesh, one element.  Running genmap with periodic
> BC's fails.  Replace the periodic BC's with walls and then genmap works.
> Anybody have any ideas?
>
> Cheers,
> Frank
>
>            ELEMENT       1 [    1a]  GROUP  0
> -0.400000E+01  0.400000E+01  0.400000E+01 -0.400000E+01
> -0.500000E+00 -0.500000E+00  0.500000E+00  0.500000E+00
> -0.500000E+00 -0.500000E+00 -0.500000E+00 -0.500000E+00
> -0.400000E+01  0.400000E+01  0.400000E+01 -0.400000E+01
> -0.500000E+00 -0.500000E+00  0.500000E+00  0.500000E+00
>  0.500000E+00  0.500000E+00  0.500000E+00  0.500000E+00
> ***** CURVED SIDE DATA *****
>       0 Curved sides follow IEDGE,IEL,CURVE(I),I=1,5, CCURVE
>  ***** BOUNDARY CONDITIONS *****
>  ***** FLUID   BOUNDARY CONDITIONS *****
> W    1  1  0.000000      0.000000      0.000000      0.000000
> 0.000000
> W    1  2  0.000000      0.000000      0.000000      0.000000
> 0.000000
> shl  1  3  0.000000      0.000000      0.000000      0.000000
> 0.000000
> W    1  4  0.000000      0.000000      0.000000      0.000000
> 0.000000
> P    1  5  1.000000      6.000000      0.000000      0.000000
> 0.000000
> P    1  6  1.000000      5.000000      0.000000      0.000000
> 0.000000
>  ***** THERMAL BOUNDARY CONDITIONS *****
>      1  1  0.000000      0.000000      0.000000      0.000000
> 0.000000
> t    1  2  0.000000      0.000000      0.000000      0.000000
> 0.000000
>      1  3  0.000000      0.000000      0.000000      0.000000
> 0.000000
> t    1  4  0.000000      0.000000      0.000000      0.000000
> 0.000000
> P    1  5  1.000000      6.000000      0.000000      0.000000
> 0.000000
> P    1  6  1.000000      5.000000      0.000000      0.000000
> 0.000000
>
>
> -- 
> 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
>