[Gmsh] Small element size factor does not work

[SAHA, SUDIPTA]

Thank you very much for your detailed answer. I need to save both physical volume and physical surface. Because the physical surface is required to assign boundary condition, and physical volume is required to assign fluid domain in openfoam.


__

Best Regards
Sudipta Saha, MS, EIT
Spent Fuel Modeling Intern, Idaho National Laboratory

PhD Candidate in Mechanical Engineering
Reacting System and Advanced Energy Research Lab
Graduate Council Representative, Graduate Student Association
LinkedIn<https://www.linkedin.com/in/sudipta-saha-usc/> | ResearchGate<https://www.researchgate.net/profile/Sudipta_Saha13> | GoogleScholar<https://scholar.google.com/citations?user=xDVKlBcAAAAJ&hl=en> | Website<https://sudiptasaha.weebly.com/>
[cid:d08a1fbf-363c-48af-89a7-5208eda51b71]



________________________________
From: Jeremy Theler <jeremy at seamplex.com>
Sent: Friday, July 24, 2020 5:19 AM
To: SAHA, SUDIPTA <sahas at email.sc.edu>; gmsh at onelab.info <gmsh at onelab.info>
Subject: Re: [Gmsh] Small element size factor does not work

RT(F)M, section F.5 question 3 in http://gmsh.info/doc/texinfo/gmsh.html#Mesh-module-questions<https://protect2.fireeye.com/v1/url?k=0df51d36-536d8ff3-0df553f7-86982a5fc978-6c42e1c918e71f54&q=1&e=de46c48d-00f9-421d-9b29-2e9858287e9d&u=http%3A%2F%2Fgmsh.info%2Fdoc%2Ftexinfo%2Fgmsh.html%23Mesh-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<https://protect2.fireeye.com/v1/url?k=4d5bff28-13c36ded-4d5bb1e9-86982a5fc978-c35de917066ff0b3&q=1&e=de46c48d-00f9-421d-9b29-2e9858287e9d&u=http%3A%2F%2Fgmsh.info%2Fdoc%2Ftexinfo%2Fgmsh.html%23Elementary-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<https://protect2.fireeye.com/v1/url?k=815b6607-dfc3f4c2-815b28c6-86982a5fc978-7f6cdf43098fe972&q=1&e=de46c48d-00f9-421d-9b29-2e9858287e9d&u=http%3A%2F%2Fgmsh.info%2Fdoc%2Ftexinfo%2Fgmsh.html%23Mesh-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 Theler
www.seamplex.com<https://protect2.fireeye.com/v1/url?k=c6583cb6-98c0ae73-c6587277-86982a5fc978-41704a233b0bf57b&q=1&e=de46c48d-00f9-421d-9b29-2e9858287e9d&u=http%3A%2F%2Fwww.seamplex.com%2F>



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)

Mesh.Algorithm = 2;
Mesh.Algorithm3D = 4;
Mesh.CharacteristicLengthFactor = 0.02;
Mesh 3;
Save "SNF_02_cmd.msh";

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
Info    : Success !
Info    : 238335 points, 1157220 elements
Info    : Done meshing 3D (Wall 1233.26s, CPU 1222.82s)

Why I am not seeing and 3D mesh in the mesh file? The log file is attached.



__

Best Regards
Sudipta Saha, MS, EIT
Spent Fuel Modeling Intern, Idaho National Laboratory

PhD Candidate in Mechanical Engineering
Reacting System and Advanced Energy Research Lab
Graduate Council Representative, Graduate Student Association
LinkedIn<https://protect2.fireeye.com/v1/url?k=39e8fa3a-677068ff-39e8b4fb-86982a5fc978-2492fd362d6846e6&q=1&e=de46c48d-00f9-421d-9b29-2e9858287e9d&u=https%3A%2F%2Fwww.linkedin.com%2Fin%2Fsudipta-saha-usc%2F> | ResearchGate<https://www.researchgate.net/profile/Sudipta_Saha13> | GoogleScholar<https://protect2.fireeye.com/v1/url?k=f8261173-a6be83b6-f8265fb2-86982a5fc978-d9b6375c1c090b26&q=1&e=de46c48d-00f9-421d-9b29-2e9858287e9d&u=https%3A%2F%2Fscholar.google.com%2Fcitations%3Fuser%3DxDVKlBcAAAAJ%26hl%3Den> | Website<https://protect2.fireeye.com/v1/url?k=6a02f614-349a64d1-6a02b8d5-86982a5fc978-2782b01c5e937e71&q=1&e=de46c48d-00f9-421d-9b29-2e9858287e9d&u=https%3A%2F%2Fsudiptasaha.weebly.com%2F>
[cid:b1e7c5e9844000e7a4b05516a22e70cbd79ddf42.camel at seamplex.com]



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