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On Tue, May 14, 2024 at 12: 14 AM Matteo Semplice <matteo. semplice@ uninsubria. it> wrote: Dear petsc-users, I am playing with DMPlexGetCellCoordinates and observing that it returns correct periodic coordinates for cells, but not for faces.
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<div dir="ltr"><div dir="ltr">On Tue, May 14, 2024 at 12:14 AM Matteo Semplice <<a href="mailto:matteo.semplice@uninsubria.it">matteo.semplice@uninsubria.it</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-3285471884708579794"><u></u>
<div style="font-size:1px;color:rgb(255,255,255);line-height:1px;height:0px;max-height:0px;opacity:0;overflow:hidden;display:none">
Dear petsc-users, I am playing with DMPlexGetCellCoordinates and observing that it returns correct periodic coordinates for cells, but not for faces. More precisely, adding PetscCall(DMPlexGetHeightStratum(dm, 1, &fStart, &fEnd)); for
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<p>Dear petsc-users,</p>
<p> I am playing with DMPlexGetCellCoordinates and observing that
it returns correct periodic coordinates for cells, but not for
faces.</p>
<p>More precisely, adding <br>
</p>
<p> <font face="monospace">PetscCall(DMPlexGetHeightStratum(dm,
1, &fStart, &fEnd));<br>
for (f = fStart; f < fEnd; ++f) {<br>
const PetscScalar *array;<br>
PetscScalar *x = NULL;<br>
PetscInt ndof;<br>
PetscBool isDG;<br>
<br>
PetscCall(DMPlexGetCellCoordinates(dm, f, &isDG,
&ndof, &array, &x));<br>
PetscCheck(ndof % cdim == 0, PETSC_COMM_SELF,
PETSC_ERR_ARG_INCOMP, "ndof not divisible by cdim");<br>
PetscCall(PetscPrintf(PETSC_COMM_SELF, "Face #%"
PetscInt_FMT " coordinates\n", f - fStart));<br>
for (PetscInt i = 0; i < ndof; i += cdim)
PetscCall(PetscScalarView(cdim, &x[i],
PETSC_VIEWER_STDOUT_SELF));<br>
PetscCall(DMPlexRestoreCellCoordinates(dm, f, &isDG,
&ndof, &array, &x));<br>
}</font><br>
</p>
<p>to src/dm/impls/plex/tutorials/ex8.c, I get <font face="monospace"><br>
</font></p>
<p><font face="monospace">$ ./ex8 -dm_plex_dim 2 -petscspace_degree
1 -dm_plex_simplex 0 -dm_plex_box_faces 3,2 -dm_plex_box_bd
periodic,none -dm_view -view_coord <br>
DM Object: box 1 MPI process<br>
type: plex<br>
box in 2 dimensions:<br>
Number of 0-cells per rank: 9<br>
Number of 1-cells per rank: 15<br>
Number of 2-cells per rank: 6<br>
Periodic mesh (PERIODIC, NONE) coordinates localized<br>
</font></p>
<p><font face="monospace">[...]</font></p>
<p><font face="monospace">Element #2 coordinates<br>
0: 6.6667e-01 0.0000e+00<br>
<font color="#26a269"> 0: 1.0000e+00 0.0000e+00
<<<----- correct<br>
0: 1.0000e+00 5.0000e-01</font><br>
0: 6.6667e-01 5.0000e-01<br>
[...]</font></p>
<p><font face="monospace">Face #0 coordinates<br>
0: 0.0000e+00 0.0000e+00<br>
0: 3.3333e-01 0.0000e+00<br>
Face #1 coordinates<br>
0: 3.3333e-01 0.0000e+00<br>
0: 6.6667e-01 0.0000e+00<br>
Face #2 coordinates<br>
<font color="#a51d2d"> 0: 6.6667e-01 0.0000e+00<br>
0: 0.0000e+00 0.0000e+00 <<<---- should be
(0.66,0.00) and (1.00,0.00)<br>
</font></font></p>
<p>Is there a way to recover correct periodic coordinates in the
case of periodic DMPLex?</p>
<p></p></div></div></blockquote><div>The way that periodic coordinates work is that it stores a DG coordinate field by cell. Faces default back to the vertices. You could think about also putting DG coordinates on faces, but no one had asked, and it is potentially expensive.</div><div><br></div><div>If you really need them to keep going, face coordinates can be extracted from cell coordinates. Otherwise, I can do it after the PETSc Meeting. Or, we are happy to take contributions adding this.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-3285471884708579794"><div><p>Thanks in advance</p>
<p>Matteo<br>
</p>
</div>
</div></blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>-- Norbert Wiener</div><div><br></div><div><a href="https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!Z9-i-9O8yBcNimBXW2alc9XHsn9MWWFwaobajlfkDcoghfrtZlVX4CRMW0BdrXaX2hOabPupZN8g9HaOBe7O$" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br></div></div></div></div></div></div></div></div>