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<br>Hello<br>With the following .geo file I create a 3D tetrahedrons <br>mesh of order 3.<br>The element associated to the two physical boundary <br>groups "B" and "U" are triangles of type 20, ie with 9 nodes. <br>I was expecting triangles of type 21, ie with 10 nodes. <br>Here I loose the nodes internal to the triangle.<br>How can I change this behavior ?<br><br>To generate the mesh I used the command line:<br>gmsh file.geo -3 -order 3 -o file.msh<br><br>Thank you.<br><br><br>file.geo<br>"""<br>Point(1) = { 0, 0, 0 };<br>Point(2) = { 1, 0, 0 };<br>Line(1) = {1,2};<br>Transfinite Line{1} = 5 + 1;<br>l = 1;<br>Surf[] = Extrude {0,l,0} {Line{1}; Layers{5}; }; <br>h = 1;<br>Vol [] = Extrude {0,0,h} { Surface{Surf[1]}; Layers{5}; };<br><br>Physical Surface("B") = {Surf[1]};<br>Physical Surface("U") = {Vol[0]};<br>Physical Volume ("V") = {Vol[1]};<br>""" </div></body>
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