Re: [Eidors Help] local mesh refinement in gmsh

[Andy A. <ad...@sc...>]

Hi Fabian,

Our main expert on gmsh, Bartek, is on vacation for a couple of weeks.
If we have other experts, I would like to here from them; otherwise, you'll
need to wait for the help.
--
Andy Adler <ad...@sc...> +1-613-520-2600x8785


On 28 July 2014 04:59, BRAUN Fabian <Fab...@cs...> wrote:
> Hi all,
>
>
>
> I am about to create a 3D model of a human thorax including electrodes
> (using place_elec_on_surf).
>
> For simulation purposes I need to refine the mesh locally at certain
> locations inside the thorax where organ movements take place (e.g. aorta and
> heart regions have 10-fold finer mesh than the other elements).
>
>
>
> In Netgen I can achieve this by generating a “..msz” file (as also discussed
> here:
> http://www.cfd-online.com/Forums/openfoam-meshing-open/111305-netgen-refinement-regions.html).
>
>
>
> However, if I understood correctly, the place_elec_on_surf command uses gmsh
> in the last step to generate the volume mesh. Thus I will need to tell gmsh
> to do this refinement.
>
> There are several ways of specifying the mesh size in gmsh:
> http://geuz.org/gmsh/doc/texinfo/gmsh.html#Specifying-mesh-element-sizes,
> however not all are supported when using the Netgen meshing algorithm.
>
>
>
> So far I’ve tried to use the default option
> (Mesh.CharacteristicLengthFromPoints)by adding a grid of points (similar to
> what one does for the .msz file in Netgen) at the end of the .geo file which
> is passed to gmsh (by slightly modifying the gmsh_stl2tet.m file):
>
> Point(1)={x1,y1,z1,MaxSizeLocalRefined};
>
> …
>
> Point(N)={xN,yN,zN,MaxSizeLocalRefined};
>
> Unfortunately, this does not seem to work as I cannot see any changes in the
> result.
>
>
>
> Does anyone have more experience with local mesh refinement in gmsh?
>
>
>
> Thanks for your useful hints in advance.
>
> Best regards,
>
> Fabian
>
>
>
> PS: I’m running Matlab R2013b, Eidors vDev (latest SVN commit: Rev4619),
> gmsh 2.8.5 and Netgen 5.1 on a Win64 machine
>
>
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