Gmsh

[Christophe Geuzaine]

keqin zhang wrote:
> 
> Hi, I am a graduate student at Northwstern University
> in USA. Right now I am using the Gmsh developed by
> you.
> I have two problems and wonder if you could help me
> out.
> 
> 1. how can I get detailed help document on how to
> write a .geo file

Hi,

Take a look at the demos files on http://www.geuz.org/gmsh/.

> 
> 2. when defining points, how to treat the
> characteristic lengths? I tried a simple geometry,
> when I choose smaller characteristic number (of
> course,  resulting in more elements), an finite
> element program, which has been used for long long
> time, no longer can correctly set up elements and
> nodes.
> 
> attached is a file, 5.geo, to illustrate the problems.
> when E1=0.25*D, mesh can be generated, but later on I
> can't use these meshes in finite element program
> because of incorrect map of elements and nodes, when
> E1=1.0*D, or E1=0.5*D, it can get through. E1 is
> around the beginning of the file, 5.geo.
> 

OK, I'll check this as soon as I have some time. (Note that you should
use a version >= 0.987: there was a severe bug in the smoothing of 3D
unstructured grids before this version).

My best,

-- 
Christophe Geuzaine

Tel: +32-(0)4-366.37.10    mailto:Christophe.Geuzaine at ulg.ac.be
Fax: +32-(0)4-366.29.10    http://www.geuz.org