[Gmsh] Small element size factor does not work

[Jeremy Theler]

RT(F)M, section F.5 question 3 in 
http://gmsh.info/doc/texinfo/gmsh.html#Mesh-module-questions
How can I only save tetrahedral elements (not triangles and lines)?

By default, if physical groups are defined, the output mesh only
contains those elements that belong to physical entities. So to save
only 3D elements, simply define one (or more) physical volume(s) and
don’t define any physical surfaces, physical curves or physical points.

Also, section 6.2 
http://gmsh.info/doc/texinfo/gmsh.html#Elementary-entities-vs-physical-groups
is
relevant:
To save all mesh elements wether or not physical groups are defined,
use
the Mesh.SaveAll option (see Mesh options list) or specify
-save_all on the command line. In some formats (e.g. MSH2),
setting Mesh.SaveAll=1 will however discard all physical group
definitions.




Regards--Jeremy Thelerwww.seamplex.com


On Fri, 2020-07-24 at 03:18 +0000, SAHA, SUDIPTA wrote:
> Hello I am trying mesh a .geo filecommand line. I have added
> following line in the script to create 3D mesh  ( 2D meshing
> algorithm Automatic, 3D meshing algorithm Frontal, and Element size
> factor 0.02)
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> Mesh.Algorithm = 2;
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> Mesh.Algorithm3D = 4;
> Mesh.CharacteristicLengthFactor = 0.02;
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> Mesh 3;
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> Save "SNF_02_cmd.msh";
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> When I check the mesh file in GUI I do not see existence of 3D mesh.
> I also confirmed in by importing into OpenFoam and Openfoam also does
> not find any volume mesh. But the log file clearly says 
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> Info    : Success !
> Info    : 238335 points, 1157220 elements 
> Info    : Done meshing 3D (Wall 1233.26s, CPU 1222.82s)
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> Why I am not seeing and 3D mesh in the mesh file? The log file is
> attached.
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> Best
>  Regards
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> Sudipta
>  Saha, MS, EIT
> 
> Spent Fuel Modeling Intern, Idaho National
>  Laboratory 
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> PhD Candidate in Mechanical Engineering
> Reacting System and Advanced Energy Research Lab
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> Graduate Council Representative, Graduate Student Association
> LinkedIn | ResearchGate | GoogleScholar | Website
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> _______________________________________________gmsh mailing 
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