[Gmsh] How to choose an element type in non-interactive mode

[David Colignon]

On 31/03/10 22:36, Umut Tabak wrote:

> Wojciech Artichowicz wrote:
>>
>> Hello,
>>
>> I would like to ask how to choose an element type in non-interactive
>> mode.
>>
>> I haven’t found it in help nor in tutorial or reference manual.
>>
>> How can I for example choose triangles or quads of 2 order (complete).
>>
> Hi
>
> as far as I know, gmsh is an unstructured mesh generator, so by default
> that generates triangular meshes(in 2D). By 'transfinite' definition
> triangles are combined into quads(I hope this is not wrong, anyway
> developers will comment on that.)

Hi,

that's right.

>>
>> So far I’ve managed to create only triangle mesh, and if elements were
>> of order higher than one, they were always incomplete.
>>
> There should be transfinite examples to generate quad meshes in the
> tutorials. Mesh order could be set with the options, I have used this
> before but do not remember now, sth like secondOrder complete, you can
> set that to 1 or 0 depending on the choice, that should be in the manual.


it is:

http://www.geuz.org/gmsh/doc/texinfo/gmsh.html#index-Mesh_002eSecondOrderIncomplete-772

Mesh.SecondOrderIncomplete
Create incomplete second order elements? (8-node quads, 20-node hexas, etc.)
Default value: 1
Saved in: General.OptionsFileName


You can choose the order on the command line with

http://www.geuz.org/gmsh/doc/texinfo/gmsh.html#Command_002dline-options

gmsh.exe inputfile.geo –o outputfile.msh  -order 3 -2

and you can add

Mesh.SecondOrderIncomplete=0;

in you .geo file

or add

-string "Mesh.SecondOrderIncomplete=0;"

on the command line

Regards,

Dave

-- 
David Colignon, Ph.D.
Collaborateur Logistique du F.R.S.-FNRS
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>
> HTH,
> Umut
>
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