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<p>Dear all,</p>
<p>it is unclear to me what is being flagged with the "marker" flag
when a mesh is created using DMPlexCreate.</p>
<p>The 2D triangular mesh pictured in the enclosed pdf has the
following features:</p>
<p>
<blockquote type="cite"><span style="font-family:monospace"><span
style="color:#000000;background-color:#ffffff;">DM Object:
2D plex 1 MPI process</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">type:
plex</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">2D plex
in 2 dimensions:</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">Number
of 0-cells per rank: 12</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">Number
of 1-cells per rank: 23</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">Number
of 2-cells per rank: 12</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">Labels:</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">celltype:
3 strata with value/size (0 (12), 1 (23), 3 (12))</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">depth:
3 strata with value/size (0 (12), 1 (23), 2 (12))</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">marker:
1 strata with value/size (1 (20))</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">Face
Sets: 4 strata with value/size (1 (3), 2 (2), 3 (3), 4 (2))</span><br>
<span style="color:#000000;background-color:#ffffff;">
</span><br>
</span></blockquote>
i.e 12 gridpoints, 23 edges and 12 triangular cells.</p>
<p>When I call DMGetStratumSize at stratum 0 to 2, this is what I
get.<br>
</p>
<p>
<blockquote type="cite"><span style="font-family:monospace"><span
style="color:#000000;background-color:#ffffff;"> </span><span
style="color:#000000;background-color:#ffffff;">CreateSectionAlternate
DMGetStratumSize found</span><span
style="color:#000000;background-color:#ffffff;"> </span><span
style="color:#000000;background-color:#ffffff;">0 'marker'
points @ depth</span><span
style="color:#000000;background-color:#ffffff;"> </span><span
style="color:#000000;background-color:#ffffff;">0 on PE#</span><span
style="color:#000000;background-color:#ffffff;"> </span><span
style="color:#000000;background-color:#ffffff;">0</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">CreateSectionAlternate
DMGetStratumSize found</span><span
style="color:#000000;background-color:#ffffff;"> </span><span
style="color:#000000;background-color:#ffffff;">20 'marker'
points @ depth</span><span
style="color:#000000;background-color:#ffffff;"> </span><span
style="color:#000000;background-color:#ffffff;">1 on PE#</span><span
style="color:#000000;background-color:#ffffff;"> </span><span
style="color:#000000;background-color:#ffffff;">0</span><span
style="color:#000000;background-color:#ffffff;">
</span><br>
<span style="color:#000000;background-color:#ffffff;">CreateSectionAlternate
DMGetStratumSize found</span><span
style="color:#000000;background-color:#ffffff;"> </span><span
style="color:#000000;background-color:#ffffff;">0 'marker'
points @ depth</span><span
style="color:#000000;background-color:#ffffff;"> </span><span
style="color:#000000;background-color:#ffffff;">2 on PE#</span><span
style="color:#000000;background-color:#ffffff;"> </span><span
style="color:#000000;background-color:#ffffff;">0</span><br>
<span style="color:#000000;background-color:#ffffff;">
</span><br>
</span></blockquote>
Is the marker flagging boundary edges or boundary vertices (nodes)
? In any case, why are there 20, instead of 10?</p>
<p>Finally: I believe face sets refers to boundary faces, where each
side of the square domain has been given a different flag.</p>
<p>How do I access the face sets information ?</p>
<p>Thanks,</p>
<p>Aldo <br>
</p>
<p><br>
</p>
<pre class="moz-signature" cols="72">--
Dr. Aldo Bonfiglioli
Associate professor of Fluid Machines
Scuola di Ingegneria
Universita' della Basilicata
V.le dell'Ateneo lucano, 10 85100 Potenza ITALY
tel:+39.0971.205203 fax:+39.0971.205215
web: <a class="moz-txt-link-freetext" href="https://urldefense.us/v3/__http://docenti.unibas.it/site/home/docente.html?m=002423__;!!G_uCfscf7eWS!c6_YYKL6k6FdMvXiZuhIJ2t5rbgB45aqicDR0WpLsZSgrs7NO0SMggi_L8KB2ZKd-w8JlcGQJTFm-uotq1RhZRDxD575sfToW2A$">http://docenti.unibas.it/site/home/docente.html?m=002423</a></pre>
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