[Gmsh] Meshing Error in v4.0.4?

[Christophe Geuzaine]

> On 30 Oct 2018, at 23:19, Jensen, Aaron J. <Aaron.J.Jensen at leidos.com> wrote:
> 
> Hello,
>  
> I am working on a fairly complicated 3D model and mesh using gmsh that requires OpenCascade (for Boolean operations mostly).  I have been running into some odd issues near some of the edges which I originally thought might be overcome by modifying my Boolean operations.  However, after quite a bit of testing I found the problem occurs for even a simple script:
>  
> SetFactory("OpenCASCADE");
> Mesh.CharacteristicLengthMax = 1.0;
> Cylinder(1) = {0, 0, 70.0, 0, 0, 60.0, 50.0}; 
>  
> I set all of the gmsh options to their defaults except for viewing element faces and you can see the resulting image attached.  I finally discovered that this does not occur in version 3.0.6 of gmsh but it does occur in version 4.0.4.  Have you seen this behavior?  I presume this is a bug or there is a flag of some kind that I need to set?


Thanks for the report - this is indeed a bug. As a workaround force e.g. the frontal algorithm:

SetFactory("OpenCASCADE");
Mesh.CharacteristicLengthMax = 1;
Cylinder(1) = {0, 0, 70.0, 0, 0, 60.0, 50.0};
Mesh.Algorithm = 6;

Christophe


>  
> Thanks,
> Aaron
> <gmshCylinder.png>_______________________________________________
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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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