[Gmsh] anisostropic meshing / bamg algorithm

Thu Feb 16 14:20:40 CET 2012

Hello Matthias,

 you can specify the entries of the mesh metric using a field which is called 
'MathEvalAniso'. In case you have svn sources of gmsh, you can find an example 
using MathEvalAniso in GMSH_SOURCE_ROOT/benchmarks/3d/CubeAniso.geo

The source code of this field is in Mesh/Field.[h/cpp]

Some more examples concerning background fields and their usage are also 
available in gmsh reference manual.

Best regards,

  Martin Vymazal

On Thursday 16 February 2012 13:05:33 Zenker, Dr. Matthias wrote:

Hi Martin,

thank you for your answer. How do I define such an anisotropic mesh size field? 
Do you have a short example, or is this described somewhere? I did not find it 
in the Reference manual.

Best regards,

Matthias

Von: Martin Vymazal [mailto:martin.vymazal at vki.ac.be] 
Gesendet: Donnerstag, 16. Februar 2012 12:17
An: gmsh at geuz.org
Betreff: Re: [Gmsh] anisostropic meshing / bamg algorithm

Hello Matthias,

you can use the bamg algorithm by calling 'gmsh -2 -algo bamg my_file.geo' from 
command line. For 3d anisotropic mesh, you do the same with '-3 -algo mmg3d'. 

You need to supply a mesh size field which will tell the anisotropic algorithm 
in which direction to refine the mesh.

Best regards,

Martin Vymazal

On Thursday 16 February 2012 10:56:06 Zenker, Dr. Matthias wrote:
Hi,

does anyone have an answer to the question below?

It was said that an anisotropic mesh can be achieved using the bamg algorithm. 
I have some questions:

1.                   My 3D geometry consists of several layers stacked in z 
direction. Some of these layers are rather thin. I would like to have a mesh 
which is finer in z direction than in x and y direction. Can this be achieved 
using the bamg algorithm? If so, how?
2.                   How can I access this algorithm from the GUI? I did not 
find it in Options – Mesh.
3.                   If not accessible from the GUI, how else can I use it?
4.                   Is there any documentation available concerning this 
topic? I did not find anything in the gmsh manual (which is from October 2010 
btw).

Thank you,

Matthias

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