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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.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Jeremy Theler <jeremy@seamplex.com><br>
<b>Sent:</b> Friday, July 24, 2020 5:19 AM<br>
<b>To:</b> SAHA, SUDIPTA <sahas@email.sc.edu>; gmsh@onelab.info <gmsh@onelab.info><br>
<b>Subject:</b> Re: [Gmsh] Small element size factor does not work</font>
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<div>RT(F)M, section F.5 question 3 in <a href="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">
http://gmsh.info/doc/texinfo/gmsh.html#Mesh-module-questions</a></div>
<div><br>
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<div><b>How can I only save tetrahedral elements (not triangles and lines)?</b>
<p>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. </p>
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<div><br>
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<div>Also, section 6.2 <a href="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">http://gmsh.info/doc/texinfo/gmsh.html#Elementary-entities-vs-physical-groups</a>
is relevant:</div>
<div><br>
</div>
<div>To save all mesh elements wether or not physical groups are defined, use the
<code>Mesh.SaveAll</code> option (see <a href="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">
Mesh options list</a>) or specify <code>-save_all</code> on the command line. In some formats (e.g. MSH2), setting
<code>Mesh.SaveAll=1</code> will however discard all physical group definitions. </div>
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<div>Regards</div>
<div>--</div>
<div>Jeremy Theler</div>
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<div>On Fri, 2020-07-24 at 03:18 +0000, SAHA, SUDIPTA wrote:</div>
<blockquote type="cite" style="margin:0 0 0 .8ex; border-left:2px #729fcf solid; padding-left:1ex">
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
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)</div>
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<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">Mesh.Algorithm = 2;</span><br>
</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<div>Mesh.Algorithm3D = 4;</div>
Mesh.CharacteristicLengthFactor = 0.02;</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Mesh 3;</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Save "SNF_02_cmd.msh";<br>
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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 </div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Info : Success !
<div>Info : 238335 points, 1157220 elements </div>
Info : Done meshing 3D (Wall 1233.26s, CPU 1222.82s)<br>
<div></div>
<br>
Why I am not seeing and 3D mesh in the mesh file? The log file is attached.</div>
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<pre>_______________________________________________</pre>
<pre>gmsh mailing list</pre>
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