[Gmsh] gmsh

[David Colignon]

Joakim Sandström wrote:
> Dear sir
> 
> I have become a fond user of gmsh when creating geometries for thermal 
> calculations. I’ve run in to trouble in these calculations when the 
> temperature gradient is very steep with a mesh that is to coarse. The 
> problem is that I do not need a fine mesh anywhere else but close to the 
> certain boundaries where the temperature gradient is steep. Creating a 
> fine mesh in the whole volume demands to much computational time. Is 
> there a way to separately specify the grid size within different 
> physical groups?
> 
> Is there also a way to specify which types of element to be generated? I 
> would like to be able to produce only prisms or hexahedrons. I’m using 
> Gmsh as a mesh generator for SAFIR (a thermal and mechanical FEM-solver 
> for fire exposed structures developed at University of Liege) and it can 
> only understand prisms and hexahedrons in the 3-D case.
> 

Hi,

The 2D structured algorithms (transfinite and extrusion) generate triangles by default, but quadrangles can be obtained 
by using the Recombine commands (see 6.3.2 Structured grids, and 6.3.3 Miscellaneous). The 3D structured algorithms 
generate tetrahedra, hexahedra, prisms and pyramids, depending on the type of the surface meshes they are based on.

see

http://www.geuz.org/gmsh/doc/texinfo/gmsh-full.html#SEC40

tutorial n° 3

http://www.geuz.org/gmsh/doc/texinfo/gmsh-full.html#SEC66

and demos/hex.geo

Cheers,

Dave

-- 
David Colignon, Ph.D.
Collaborateur Logistique du F.R.S.-FNRS
CÉCI - Consortium des Équipements de Calcul Intensif
ACE - Applied & Computational Electromagnetics
Sart-Tilman B28
Université de Liège
4000 Liège - BELGIQUE
Tél: +32 (0)4 366 37 32
Fax: +32 (0)4 366 29 10
WWW:    http://hpc.montefiore.ulg.ac.be/
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> 
> Best regards
> 
> Joakim Sandström
> 
> PhD student at Luleå University of Technology
> 
> 
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