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<body dir="ltr" style="text-align:left; direction:ltr;"><div>RT(F)M, section F.5 question 3 in <a href="http://gmsh.info/doc/texinfo/gmsh.html#Mesh-module-questions">http://gmsh.info/doc/texinfo/gmsh.html#Mesh-module-questions</a></div><div><br></div><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></div><div><br></div><div>Also, section 6.2 <a href="http://gmsh.info/doc/texinfo/gmsh.html#Elementary-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="http://gmsh.info/doc/texinfo/gmsh.html#Mesh-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><div><br></div><div><br></div><div><br></div><div><br></div><div>Regards</div><div>--</div><div>Jeremy Theler</div><div><a href="http://www.seamplex.com">www.seamplex.com</a></div><div><br></div><div><br></div><div><br></div><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">
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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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<span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt;">Mesh.Algorithm = 2;</span><br>
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<div>Mesh.Algorithm3D = 4;</div>
Mesh.CharacteristicLengthFactor = 0.02;</div>
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Mesh 3;</div>
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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>
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Info : Success !
<div>Info : 238335 points, 1157220 elements </div>
Info : Done meshing 3D (Wall 1233.26s, CPU 1222.82s)<br>
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Why I am not seeing and 3D mesh in the mesh file? The log file is attached.</div>
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<div id="Signature" style=""><span style="font-size:12pt"><font face="Calibri,Arial,Helvetica,sans-serif" color="black" size="3"></font></span><font color="#000000" style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt"><span style="font-family:Arial,Helvetica,sans-serif">Best
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<span style="font-family:Arial,Helvetica,sans-serif"></span><span style="font-family:"Times New Roman",Times,serif"></span><font face="Helvetica" color="#333399" size="2"><span style="font-size:12pt; font-family:Arial,Helvetica,sans-serif; color:rgb(134,17,6)"><b>Sudipta
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<pre>_______________________________________________</pre><pre>gmsh mailing list</pre><a href="mailto:gmsh@onelab.info"><pre>gmsh@onelab.info</pre></a><pre><br></pre><a href="http://onelab.info/mailman/listinfo/gmsh"><pre>http://onelab.info/mailman/listinfo/gmsh</pre></a><pre><br></pre></blockquote></body></html>