[Gmsh] Non-uniform mesh in a multi-STL geometry

[Christophe Geuzaine]

On 25 Dec 2012, at 04:19, Einat Lev <einatlev at ldeo.columbia.edu> wrote:

> Hello all
> I have a GEO file which merges two STL surfaces, which together create a single-surface closed volume.(following the helpful advice given in http://geuz.org/pipermail/gmsh/2010/005275.html)
> gMsh has no problem making a 3D volume mesh for the combined surface.
> 
> What I'm trying to do now is to have the volume mesh fine near one surface (the outer shell of the volume) and coarser in the interior.
> I followed instructions for using an Attractor field and a Threshold field and then a resulting field that takes the minimum. This strategy have worked for me before for simple surfaces created inside gMsh (e.g. a pipe, a box -- see attached picture). But now when I am trying it for the STL model, I get errors saying that:
> Error   : Cannot interpolate discrete surface
> 

You'll have to reparametrize the surfaces first. Cf. "STL remeshing" on the wiki.

Christophe


> Is there any other way to do this sort of refinement?
> 
> All the best,
> Einat 
> 
> <EtnaFlow6.geo><toponly_matlab.stl><bottomonly_matlab.stl><RefiniementExample.tiff>
> 
> 
> 
> 
> 
> 
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine