[Nek5000-users] n2to3 to create a tube

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

Hola SL,

I met this problem just some days ago, and what I did to solve it via
making sure the rotating axis is Y-axis !!!
so you must be aware that your 2D mesh has a Y reflection symmetry. then
the next step should be fine.

good luck!

saludo.

2016-04-11 15:57 GMT+02:00 <nek5000-users at lists.mcs.anl.gov>:

>
> Hi Neks,
>
> I am trying to use n2to3 to create an axisymmetric mesh. I have created a
> 2D mesh using gmsh and it works. Now, the idea is to extrude the 2D mesh to
> create a tube (circular sweep). However, n2to3 doesn't seem to work.
>
> In the 2d file the geometry is rectangular with SYM boundary conditions in
> the x axis. Is it possible to use n2to3 to create the tube, or half of the
> tube? If it is possible what are the files that I need? I suppose that with
> the gemoetry_2d.rea file should be enough, shouldn't it?
>
> I realized that:
>
> If I set the number of planes to, let's say -10, and
>  input z min:
> 0
>  input z max:
> 90
>
> I have problems with genmap
>
> NOTE: smaller is better, but generous is more forgiving for bad meshes.
> 0.2
>  reading .rea file data ...
>  start locglob_lexico:           8       47680      381440
> 0.20000000000000001
>  locglob:           1           1      381440
>  locglob:           2         666      381440
>  locglob:           3        2536      381440
>  locglob:           1       51469      381440
>  locglob:           2       51644      381440
>  locglob:           3       51644      381440
>  locglob:           1       51644      381440
>  locglob:           2       51644      381440
>  locglob:           3       51644      381440
>
>      1     2     4  Matrix:  SELF!!
>        1 SELF!!    11362    11361    11362    11361
>        2 SELF!!     9722     9721     9729     9728
>  cont: SELF!!           1   ??
>
>  ABORT: SELF-CHK            1           5           1           0
>  Try to tighten the mesh tolerance!
>
>            0  quit
>
>
> However, if I increase the number of planes, let's say -80, it seems that
> genmap also works. But, when I run the numerical simulations and I try to
> plot some snapshots, I cannot see anything. It seems that there is a
> problem with the connectivity. What I am missing?
>
> Thanks in advance.
> Cheers
> SL
>
>
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-- 

Wei HE 何偉
School of Aeronautics
Universidad Politécnica de Madrid
http://www.cfm.upm.es/
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