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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">I try to create a block with the top surface containing a disk:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">//+<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">SetFactory("OpenCASCADE");<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">//+<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Box(1) = {-25, -25, -50, 50, 50, 50};<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">//+<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Disk(7) = {0, 0, 0, 0.5, 0.5};<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">//+<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">BooleanDifference{ Surface{6}; Delete; }{ Surface{7}; }<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">//+<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Characteristic Length {9} = 0.05;<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">//+<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Delete {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> Volume{1}; <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">}<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">//+<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Surface Loop(2) = {1, 3, 5, 4, 2, 6, 7};<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">//+<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Volume(1) = {2};<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">//+<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Physical Volume("bulk") = {1};<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">//+<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Physical Surface("disk") = {7};<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">//+<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Physical Surface("top") = {6};<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">//+<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Physical Surface("bottom") = {5};<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">//+<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Physical Surface("side") = {1, 4, 2, 3};<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The problem is that the surface 6 is not attached to the volume, but there is a new surface 8 instead which is identical to surface 6, and which is used for the volume.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Consequently, when I create a mesh, the boundary corresponding to surface 6 is not attached to the volume, i.e. the nodes of surface 6 do not figure in tetrahedra of the volume, and surface 6 is not recognized by Elmer
on import.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">What do I do wrong?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Thank you for a hint,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Matthias<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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