[Gmsh] Different results for different stations or users

[David Colignon]

Hi,

If it is not the case, you should try with a recent version of Gmsh. In the release notes ( 
http://www.geuz.org/gmsh/doc/VERSIONS.txt ) of the 2.9.0 version you can find: "improved reproductibility of 2D and 3D meshes;", 
and for the 2.8.4 version: "better reproductibility of 2D meshes;"

Regards,

Dave

-- 
David Colignon, Ph.D.
1er Logisticien de Recherche
Université de Liège
ACE - Applied & Computational Electromagnetics
Quartier POLYTECH 1 - Montefiore B28
Allée de la découverte 10
4000 Liège - BELGIQUE
Tél: +32 (0)4 366 37 32
http://www.ulg.ac.be/nic4



On 21/09/15 10:25, RENARD Francois wrote:
> Hello,
>
> Thank you for this great mesh tool !
>
> I obtain (slightly) different results when running GMSH from the same geometry (.geo file) :
>
> - on different (linux CentOS 6.7) stations
>
> - on the same machine but from different users
>
> For example two different users have obtained the following different results on the same station :
>
> First user : 86048 vertices 553346 elements 382088 tetrahedra
> Statistics:
>
>    Input points: 50580
>    Input facets: 101156
>    Input segments: 151734
>    Input holes: 0
>    Input regions: 0
>
>    Mesh points: 50580
>    Mesh tetrahedra: 151938
>    Mesh faces: 354454
>    Mesh edges: 253095
>    Mesh faces on exterior boundary: 101156
>    Mesh edges on exterior boundary: 151734
>    Mesh faces on input facets: 101156
>    Mesh edges on input segments: 151734
>
> Info    : 50580 points 253095 edges and 101156 faces in the initial mesh
> Info    : Found region 1
> Info    : 0 points created - Worst tet radius is 24.375 (PTS removed 0 0)
> Info    : 4927 points created - Worst tet radius is 1.73689 (PTS removed 0 73)
> Info    : 9901 points created - Worst tet radius is 1.45257 (PTS removed 0 99)
> Info    : 14867 points created - Worst tet radius is 1.29636 (PTS removed 0 133)
> Info    : 19826 points created - Worst tet radius is 1.1871 (PTS removed 0 174)
> Info    : 24786 points created - Worst tet radius is 1.10673 (PTS removed 0 214)
> Info    : 29730 points created - Worst tet radius is 1.05069 (PTS removed 0 270)
> Info    : 34664 points created - Worst tet radius is 1.00635 (PTS removed 0 336)
> Info    : 3D point insertion terminated (86048 points created):
> Info    :  - 344 Delaunay cavities modified for star shapeness
> Info    :  - 340 points could not be inserted
> Info    :  - 382088 tetrahedra created in 6.25905 sec. (61045 tets/sec.)
> Info    : Done meshing 3D (14.4008 s)
> Info    : 86048 vertices 553346 elements
> Info    : Writing 'geom3d.msh'...
> Info    : Done writing 'geom3d.msh'
> Info    : Stopped on Fri Sep 18 15:47:55 2015
>
> Second user : 86048 vertices 553388 elements 382130 tetrahedra
> Statistics:
>
>    Input points: 50580
>    Input facets: 101156
>    Input segments: 151734
>    Input holes: 0
>    Input regions: 0
>
>    Mesh points: 50580
>    Mesh tetrahedra: 151938
>    Mesh faces: 354454
>    Mesh edges: 253095
>    Mesh faces on exterior boundary: 101156
>    Mesh edges on exterior boundary: 151734
>    Mesh faces on input facets: 101156
>    Mesh edges on input segments: 151734
>
> Info    : 50580 points 253095 edges and 101156 faces in the initial mesh
> Info    : Found region 1
> Info    : 0 points created - Worst tet radius is 24.375 (PTS removed 0 0)
> Info    : 4930 points created - Worst tet radius is 1.73677 (PTS removed 0 70)
> Info    : 9906 points created - Worst tet radius is 1.45214 (PTS removed 0 94)
> Info    : 14871 points created - Worst tet radius is 1.29598 (PTS removed 0 129)
> Info    : 19830 points created - Worst tet radius is 1.18694 (PTS removed 0 170)
> Info    : 24789 points created - Worst tet radius is 1.10668 (PTS removed 0 211)
> Info    : 29731 points created - Worst tet radius is 1.05068 (PTS removed 0 269)
> Info    : 34670 points created - Worst tet radius is 1.00629 (PTS removed 0 330)
> Info    : 3D point insertion terminated (86048 points created):
> Info    :  - 345 Delaunay cavities modified for star shapeness
> Info    :  - 335 points could not be inserted
> Info    :  - 382130 tetrahedra created in 6.28704 sec. (60780 tets/sec.)
> Info    : Done meshing 3D (14.4428 s)
> Info    : 86048 vertices 553388 elements
> Info    : Writing 'geom3d.msh'...
> Info    : Done writing 'geom3d.msh'
> Info    : Stopped on Fri Sep 18 14:26:18 2015
>
> Is it possible to better control the gmsh calculations in order to obtain the same results ?
>
> Thank you
>
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