[Gmsh] How to defined characteristic length?

[David Colignon]

Hi,

you should first read the first tutorial:

http://geuz.org/gmsh/doc/texinfo/gmsh.html#t1_002egeo


and the documentation:

http://geuz.org/gmsh/doc/texinfo/gmsh.html#Mesh

...
Every meshing step is constrained by the characteristic length field, which can be uniform, specified by characteristic 
lengths associated with points in the geometry,...



http://geuz.org/gmsh/doc/texinfo/gmsh.html#Characteristic-lengths

6.3.1 Characteristic lengths

There are three ways to specify the size of the mesh elements for a given geometry:

    1. First, if Mesh.CharacteristicLengthFromPoints is set (it is by default), you can simply specify characteristic 
lengths at the geometrical points of the model (with the Point command: see Points). The size of the mesh elements will 
then be computed by linearly interpolating these characteristic lengths on the initial mesh (see Mesh).
...


http://geuz.org/gmsh/doc/texinfo/gmsh.html#Points

Point ( expression ) = { expression, expression, expression <, expression > };
     Creates an elementary point. The expression inside the parentheses is the point's identification number; the three 
first expressions inside the braces on the right hand side give the three X, Y and Z coordinates of the point in the 
three-dimensional Euclidean space; *the optional last expression sets the characteristic mesh length at that point*
...


Regards,

Dave


--
David Colignon, Ph.D.
Collaborateur Logistique du F.R.S.-FNRS
CÉCI - Consortium des Équipements de Calcul Intensif
ACE - Applied & Computational Electromagnetics
Institut Montefiore 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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On 13/12/09 10:13, aditap khonjug wrote:
> I'm use gmsh for My thesis.
>
> I have very problem with characteristic length of gmsh.
>
> I would like to define mesh size by defined characteristic length.
>
> How to defined characteristic length? if I would like to defined mesh size.
>
> thank you for attention.
>
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