[Gmsh] Meshing stackup with thin & thick layers

[Zenker, Dr. Matthias]

Hi,

AFAIK in Elmer you cannot assign a material to a surface in a 3D simulation, so you need those very flat volumes.
There is a 3D meshing algorithm in gmsh (MMG3D) which in principle allows anisotropic mesh width. I have not succeeded in the past to get it working for a similar problem, as it was not available for volumes with internal boundaries. See the following post from the mailing list: http://www.geuz.org/pipermail/gmsh/2013/008379.html. This is a year ago, however, and things might have evolved since then.

@Christophe: Have they…? ;)

HTH,

Matthias

Von: Drew D [mailto:drewd423 at gmail.com]
Gesendet: Montag, 6. Oktober 2014 14:52
An: Christophe Geuzaine
Cc: gmsh at geuz.org
Betreff: Re: [Gmsh] Meshing stackup with thin & thick layers

Christophe,

Thanks for the response. Don't I need to treat them as volumes so that I can assign them different materials in my solver? I'm using Elmer, btw.

Drew

On Mon, Oct 6, 2014 at 4:16 AM, Christophe Geuzaine <cgeuzaine at ulg.ac.be<mailto:cgeuzaine at ulg.ac.be>> wrote:

On 01 Oct 2014, at 22:23, Drew D <drewd423 at gmail.com<mailto:drewd423 at gmail.com>> wrote:

> I have a composite stackup with alternating thin & thick layers. The thick ones are are rougly 10x the thickness of the thin ones, and the aspect ratio is on the order of 100:1. The mesh for something like this is always huge. Is there a way to treat the thin layers as 2D shells, while keeping the thicker ones 3D? The model is being exported as a STEP file and brought into Gmsh.
>

Just include the surfaces in your model; Gmsh generates conformal meshes so this internal surface can then be treated as a thin layer in your solver. If you need duplicated nodes on the surface (which Gmsh normally does not generate), you can run Plugin(Crack) on the resulting mesh.


> Thanks,
> Drew
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--
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine





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