[Gmsh] Characteristic Length and Netgen Element Size

[Christophe Geuzaine]

Julian Swartz wrote:
> Hi,
> 
> When I try meshing the same domain with the Netgen algorithm, I get 
> elements with an average edge length much larger than that obtained with 
> the Gmsh isotropic algorithm. Why does this happen? The mesh size is 
> controlled by defining all points with the same characteristic length. 
> How can I get meshes with roughly the same average edge lengths from 
> both meshing algorithms?
> 

I don't know the internals of Netgen well enough to give a definite 
answer, but my guess is that it should be possible to obtain equivalent 
element sizes. At the moment we just call m->CalcLocalH() in 
NgAddOn_GenerateVolumeMesh() (cf. contrib/Netgen/nglib_addon.cpp : this 
file defines all the routines required by the gmsh-netgen interface).



> Julian
> 
> 
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-- 
Christophe Geuzaine
Assistant Professor, Case Western Reserve University, Mathematics
http://www.case.edu/artsci/math/geuzaine