[Gmsh] help

[Christophe Geuzaine]

g.ascanio at libero.it wrote:
> Hi, I'm Gianluca Ascanio.
> I'm an aeronautical engeneer and I'm actually collaborating with the Aeronautics and Mechanics dept., Università di Roma La Sapienza.
> 
> We're interested in CFD flames simulation and I'm trying to create a 2D unstructured mesh of a coaxial injector, as you can see in the attached .geo file.
> 
> It's the first time I use gmsh (and I've always dealt with structured meshes...), so I can't understand why everything works fine if I use a low resolution (refining factor k>=7, LC=cost*k), but if I use a lower characteristic length (higher resolution) gmsh is no more able to compute the mesh.
> 
> The error message returned is 
> "Colinear points in circum circle computation.
> Initial mesh is wrong. Try the new isotropic algorithm."
> 
> which goes in loop...
> 
> Please, can you explain me what happens???

The old algorithm is crappy: use the new one 
(Tools->Options->Mesh->General->2D algorithm->Triangle, or just "-algo 
tri" on the command line)


> 
> Thank you in advance,
> 
> Gianluca
> 
> 
> 
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-- 
Christophe Geuzaine
Assistant Professor, Case Western Reserve University, Mathematics
http://www.case.edu/artsci/math/geuzaine