[Gmsh] Re: Gmsh digest, Vol 1 #61 - 1 msg

[Laurent CHAMPANEY]

There is mesh mesh generator called Tetgen (www.weboo.com/sh/tetgen.htm)
that uses a tetrahedral quality algorithm.
It seams that it uses the Shewuck's quality algorithm (??)
L. CHAMPANEY

Shewchuk


Jean-Francois Remacle wrote:

>> Hello,
> 
> 
> Hello,
> 
>> I've been trying to use gmsh to construct 3D tetrahedral grids for our
>> CFD work. I have run into considerable problems due to the creation of
>> very flat tetrahedra when producing grids for complex geometries. Most
>> of the
>> flat tetrahedra are rather envelope-shaped. If you are interested, I
>> can send a .geo file which will produce this effect.
> 
> 
> The current version of the 3D tet mesh generator does not involve
> any optimization steps. That means that slivers are often generated.
> We have a procedure to improve mesh quality by edge and
> face swapping but I just looked into the code and that part
> is commented ;-) I guess there are bugs.
> 
>> This mucks up my calculations due to instabilities.
>> 
> 
> Yes, I know.
> 
>> I'm aware that the 3D grid generator is still experimental, but
>> nevertheless I would like to ask if there exists a sort of
>> workaround for this. Or is it foreseen that the problem will
>> be tackled in the near future?
> 
> 
> If you can find a tet mesh optimizator, that would help. I'm
> going to work on that part and see what is wrong in my optimization
> procedure.
> 
>> Otherwise I must say that the software looks very nice. I actually
>> used it for a number of grids, but most of them have proven to be not
>> really that useful due to this problem :-(.
> 
> 
> Too bad, we're going to work on that.
> 
> JF
> 
>> TIA for any answer
>> 
>> Thomas
>> 
>> 
> 
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> 
> 

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