[Gmsh] How to control the quality of 3D tetrahedral mesh during creation ?

[Christophe Geuzaine]

Can you share the STL? Maybe the quality is constrained by the quality of the input triangles.

Christophe

> On 21 Dec 2018, at 03:30, Prithivirajan V <prithivi.purdue at gmail.com> wrote:
> 
> Dear Gmsh users,
> 
> I am using Gmsh to convert a bunch of .STL files to a 3D volume mesh ( tetrahedral) using the following set of 4 commands. 
> 
> ###############################
> 1.  Merge command for all the stl files I have ( showing just one below)
> 
> Merge "Path\Grain_1.stl";
> Surface Loop(1)={1};
> Volume(1)={1};
> Physical Volume (1)={1};
> 
> 2.  Path\gmsh.exe -3 -order 1 optimize out_temp.geo > meshing.log
> (out_temp.geo contains the merge command and others for all stl files as shown in 1)
> 
> 3. Path\gmsh.exe -0 -o out_temp.msh out.geo >> meshing.log
> 
> 4. Path\gmsh.exe out_temp.msh -0 -o ABAQUS.inp
> ###################################
> 
> The issue is that I am getting 3 % bad elements in my volume mesh. I am using the mesh qiality metric defined by circumsphere radius / insphere radius.
> 
> How do I improve the quality of my final 3D volume mesh ? Could anyone offer your advise in this ?
> 
> -Prithivi
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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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