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Hi Umut,<br>
<br>
For a surface, meshed with triangles:<br>
If you extrude without Recombine, you get tetrahedra.<br>
If you extrude with Recombine, you get prisms.<br>
<br>
For a surface, meshed with quadrangles (use first lines of your code):<br>
If you extrude without Recombine, no 3D mesh is generated. A little
bug? We'll have a look.<br>
If you extrude with Recombine, you get hexaedra.<br>
<br>
Ruth<br>
<br>
Umut Tabak wrote:
<blockquote cite="mid:4918CAC5.30409@tudelft.nl" type="cite">Dear all,
<br>
<br>
In a hexahedral mesh generation, I can do the tetrahedral meshing
without problems with the below piece of code. But uncommenting the
commented lines results in this problem : My surface is extruded,
however the surfaces in the direction of the extrusion are meshed with
quadrangles and the others with triangles and (I guess) as a result, I
can not get a hexahedral mesh for a simple box geometry. I am sure I
am missing sth simple from the manual and your help is appreciated.
<br>
<br>
P.S. I think I can define 8 corners of my box, define lines and
surfaces with transfinite to end up with the hexa mesh. But I wondered
the correct usage of extruded mesh option if I understood correctly
from the manual with the code below(lines uncommented).
<br>
<br>
Thanks for the replies in advance. Attached also the include file.
<br>
<br>
Umut
<br>
<br>
11 Include "truck3d_1r.geo";
<br>
12
<br>
13 // Transfinite Line{1} = 21 ;
<br>
14 // Transfinite Line{2,4} = 11;
<br>
15 // Transfinite Line{3} = 21;
<br>
16 // Transfinite Surface{10} = {1,2,3,4};
<br>
17 // Recombine Surface { 10 };
<br>
18 // Physical Surface(4) = {10};
<br>
19 // vol[]=Extrude {0.0,0.0,0.5}{
Surface{10};Layers{10};Recombine; };
<br>
20 // vol[]=Extrude {0.0,0.0,0.5}{ Surface{10};Layers{10}; };
<br>
21 vol[]=Extrude {0.0,0.0,0.5}{ Surface{10}; Layers{5}; };
<br>
22 //Transfinite Volume {11} = vol[1] ;
<br>
23 Physical Volume (11) = { vol[1] } ;
<br>
24 // binary format
<br>
25 // Mesh.MshBinary = 1 ; // GMSH 2.2.4
<br>
26 // Mesh.Binary = 1 ; // GMSH 2.2.5 changed to this
<br>
27 // color
<br>
28 // Mesh.Color.Quadrangles ;
<br>
29 // Nastran bdf format : option value is 31 for BDF output
<br>
30 // Mesh.Format = 31 ;
<br>
<br>
<br>
<pre wrap=""><pre wrap="">
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</pre></pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Dr. Ir. Ruth V. Sabariego
University of Liege, Institut Montefiore,
Dept. of Electrical Engineering & Computer Science,
Applied & Computational Electromagnetics (ACE),
Sart Tilman Campus, Grande Traverse, 10 (B28), B-4000 LIEGE, Belgium
phone: +32-4-3663737 -- fax: +32-4-3662910 -- <a class="moz-txt-link-freetext" href="http://elap.montefiore.ulg.ac.be/">http://elap.montefiore.ulg.ac.be/</a></pre>
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