[Gmsh] Getting rid of small faces and features

[Christophe Geuzaine]

Dear Hannes,

Indeed the best way would be to clean up the CAD. But the "Compound" feature can also help: see e.g.

https://gitlab.onelab.info/gmsh/gmsh/-/blob/master/benchmarks/step/part_compound_curved_mesh.geo

Christophe


> On 29 Jun 2020, at 16:21, Hannes Kröger <hannes at kroegeronline.net> wrote:
> 
> Hi All,
> 
> I created the mesh (2D) shown below from some CAD model.
> 
> The CAD model has a lot of strip-like faces which gmsh meshes very brave and treats their boundaries as feature curves. Unfortunately, the surface is later one side of a contact zone in FEM and I suspect these tiny faces to cause trouble.
> 
> The specified minimum mesh size is larger than these strips so this setting is obviously not enough. Is there a way to make the cells span these tiny strip faces?
> 
> PS: I'm aware there is a repair feature in OpenCASCADE. Although this removes the strip faces visually, I can no longer mesh the geometry after repair and only error appear.
> 
> <cijebbfdhebppgpf.png>
> 
> Thanks for any hint.
> 
> Regards, Hannes
> 
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine