[Gmsh] simple hexahedron with periodic, aka. conforming, boundary mesh ?

[Oswald Benedikt]

Hello Guillaume, thanks at lot, in fact what give me problems are the surface meshes
on the xz plane, i.e. at y min and y max.

I changed the orientation of the lines and now get reasonable mesh on the xz plane.

However, they do not match, it is not much, but still visible.

Is there a way to influence this ?

The modified .geo script is attached.

Thanks, Benedikt


------------------------------------------------------------------------------------------------------------------
Benedikt Oswald, Dr. sc. techn., dipl. El. Ing. ETH, www.psi.ch, Computational Accelerator Scientist
Paul Scherrer  Institute (PSI), CH-5232 Villigen, Suisse, benedikt.oswald at psi.ch, +41(0)56 310 32 12
"Passion is required for any great work, and for the Revolution passion and audacity are required in big doses.", 
Ernesto 'Che' Guevara, Letter to his parents.
http://amas.web.psi.ch
------------------------------------------------------------------------------------------------------------------




-----Original Message-----
From: guillaume.demesy at fresnel.fr [mailto:guillaume.demesy at fresnel.fr]
Sent: Thu 2/2/2012 17:46
To: Oswald Benedikt
Cc: gmsh at geuz.org
Subject: Re: [Gmsh] simple hexahedron with periodic, aka. conforming,      boundary mesh ?
 
Hi Benedict

>From what I remember, the order/orientation of your edges does matter a
lot in the definition of periodic surface.

You should maybe try to modify this kind of instructions:
Periodic Surface SURFSLAVEX { l00v,-l13,-l03v,l03 } = SURFMASTERX {
l01v,l11,-l02v,-l01 };

by something like:
Periodic Surface SURFSLAVEX { l00v,-l13,-l03v,l03 } = SURFMASTERX {
-l01v,l01,102v,-111};

... and see what happens!

Best of luck,

Guillaume


> Dear GMSH developers and users
>
> attached you will find a simple .geo script that tries to create a
> tetrahedral mesh
> for a hexahedron whose respective surface meshes should be conforming so
> as
> to allow for simple implementation of periodic boundary conditions.
>
> As it appears in my gmsh version:
>
> GUI toolkit: FLTK 1.3.0
>  * Build OS: MacOSX
>  * Build date: 20111203
>  * Build host: ace25.montefiore.ulg.ac.be
>  * Build options: Ann Bamg Bfgs Blas(VecLib) Blossom Chaco DIntegration
> Dlopen FlTree Fltk GMP Gmm Jpeg(Fltk) Kbipack Lapack(VecLib) MathEx Med
> Mesh Metis Mmg3d Mpeg NativeFileChooser Netgen OpenCascade OpenGL PETSc
> Parser Plugins Png(Fltk) Post SLEPc Salome Solver Tetgen Zlib
>  * Packaged by: geuzaine
>
>
> There will be conforming periodic surface meshes in x and z direction but
> the surface mesh in the y direction
> crashes, with an ugly surface mesh that does not cover the rectangular
> surface.
>
> Is my .geo script wrong or does this simply not yet work in gmsh ?
>
> Is there any way to work around this ?
>
>
> Last but not least, I should say that in a gmsh version of last year, I
> actually managed to create a correct mesh
> but now with the very same script that does not work any more.
>
>
> Thanks for having a look, Benedikt
>
>
>
>
>
>
>
>
>
> ------------------------------------------------------------------------------------------------------------------
> Benedikt Oswald, Dr. sc. techn., dipl. El. Ing. ETH, www.psi.ch,
> Computational Accelerator Scientist
> Paul Scherrer  Institute (PSI), CH-5232 Villigen, Suisse,
> benedikt.oswald at psi.ch, +41(0)56 310 32 12
> "Passion is required for any great work, and for the Revolution passion
> and audacity are required in big doses.",
> Ernesto 'Che' Guevara, Letter to his parents.
> http://amas.web.psi.ch
> ------------------------------------------------------------------------------------------------------------------
>
>
>
> _______________________________________________
> gmsh mailing list
> gmsh at geuz.org
> http://www.geuz.org/mailman/listinfo/gmsh
>




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