[Gmsh] Difficulties with remeshing.

[Christophe Geuzaine]

Hans Minnebo wrote:

> Hello,
> 
> I'm trying to mesh a 3D-geometry (a cube) with a given "characteristic 
> length"-field gievn on an initial mesh.
> (cylindrical, length depending on the distance to the cylinders axis) 
> using :
> -"Apply as background mesh" with the interface, or
> -the following command 'gmsh geoname.geo -bgm lengthfield.pos -3'.
> 
> In both cases, the newly generated mesh does not satisfy the given 
> length field : the concerned surfaces are correctly modified (in my case 
> : refined), but the volumes are not. Only the (volumic) vicinity of the 
> surfaces seem to be correctly changed.
> 
> When I create thin layers, the surface effect gives me an almost correct 
> result. So  I have created a thick geometry with thin layers (very heavy).
> 
> Is it possible that GMSH is not able to proceed this operation in 
> specific cases (including mine)?(like attractors in 3D)
> Is there an other command that I have not found?
> 
> Any suggestion is welcome.
> 

Yes, I've noticed some problems with the 3D background mesh recently,
too. Could you send me your 2 example files? I will enter them in our
bug directory.

Thanks,

Christophe

-- 
Christophe A. Geuzaine
Applied and Computational Mathematics, Caltech
geuzaine at acm.caltech.edu - http://geuz.org