Gmsh

keqin zhang kenn2003 at yahoo.com
Mon Nov 13 19:38:27 CET 2000


dear Christophe,

I am using Gmsh 0.99 version. How can use Hexahedra
mesh instead of tetrahedons? I can't find the option
for Hex in the software. Is the 'transfinite' somewhat
related?


thanks,







--- Christophe Geuzaine
<Christophe.Geuzaine at ulg.ac.be> wrote:
> 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


=====
kenn

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