[Gmsh] gmsh vs. netgen, memory issue

[Christophe Geuzaine]

On 24/11/09 15:02, Aron Wahlberg wrote:
> Hi all,
>
> I tried to mesh a pretty big geometry I'm working on with netgen but ran
> out of memory on my 16 GB RAM machine. Is there any chance gmsh is more
> efficient?

The default 3D algorithm ("Delaunay") generates about 7 million 
tetrahedra per gigabyte of RAM on a 32 bit machine. Gmsh also integrates 
Netgen (choose the 3D "Frontal" algorithm), so you can compare both.

>
> I assume making a surface mesh takes less memory than full 3D? If so, I
> should be able to make a surface mesh (with the 2D button) even if I run
> out of memory for the full 3D in gmsh, right?

Yes. For very large 2D meshes also use the "Delaunay" 2D algorithm.

>
> Aron Wahlberg
>
>
>
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>


-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine