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<div class="moz-cite-prefix">Hello,<br>
<br>
I tried the "next" branch from the git repository.<br>
The function PetscDSAddBoundary correctly set the boundary values,
but there is still the bug of the boundary applied to the whole
element.<br>
I'll dig a little in DMPlexVecSetFieldClosure_Internal() of
knepley/fix-plex-bc-multiple where the possible bug should be.<br>
<br>
I now use a simple Poisson FE test case in order to check the
boundaries.<br>
<br>
I hope these details helps a little...<br>
<br>
Regards,<br>
<br>
Yann<br>
<br>
<br>
Le 24/11/2017 à 11:34, Yann Jobic a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:b9e3cc25-cedf-4a17-c0c2-2524180f988d@univ-amu.fr">
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<div class="moz-cite-prefix">Le 23/11/2017 à 13:45, Matthew
Knepley a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAMYG4G=Mi_gfeu8aM-jMLx_Zxk1nyk69QOWOjKga1W2deO3GmQ@mail.gmail.com">
<div dir="ltr">
<div class="gmail_extra">
<div class="gmail_quote">On Thu, Nov 23, 2017 at 3:39 AM,
Yann Jobic <span dir="ltr"><<a
href="mailto:yann.jobic@univ-amu.fr" target="_blank"
moz-do-not-send="true">yann.jobic@univ-amu.fr</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<div class="m_2693683614766768657moz-cite-prefix">Hello,<br>
<br>
I checked out the branch
knepley/fix-plex-bc-multiple, but i now have a
strange problem.<br>
I splited my labels as in ex69.c of snes. It may be
the right way to do it.<br>
In petsc 3.8.2, i have the same behavior as before,
the element containing the face is called by
PetscDSAddBoundary.<br>
In the git version, PetscDSAddBoundary does not call
my boundary function at all.<br>
The call :<br>
ierr = PetscDSAddBoundary(prob, DM_BC_ESSENTIAL,
"wallL", "markerLeft", 0, Ncomp, components, (void
(*)(void)) uIn, 1, &id, ctx);CHKERRQ(ierr);<br>
<br>
I checked that my labels are correct :<br>
markerLeft: 1 strata with value/size (1 (11))<br>
markerTop: 1 strata with value/size (1 (11))<br>
markerRight: 1 strata with value/size (1 (11))<br>
markerBottom: 1 strata with value/size (1 (11))<br>
<br>
What am i doing wrong ?<br>
</div>
</div>
</blockquote>
<div><br>
</div>
<div>So you call AddBoundary() and then the boundary
values are never inserted? The call looks correct. Can
you send me an example to check?</div>
<div>Obviously this works for my simple examples in the
repo. I can't see by looking what might be wrong for
you.</div>
</div>
</div>
</div>
</blockquote>
Hello,<br>
I may have the wrong git directory.<br>
I've got the message when i'm compiling :<br>
The version of PETSc you are using is out-of-date, we recommend
updating to the new release<br>
Available Version: 3.8.2 Installed Version: 3.8<br>
<br>
As i'm not familiar with git, I've done :<br>
git clone <a class="moz-txt-link-freetext"
href="https://bitbucket.org/petsc/petsc" moz-do-not-send="true">https://bitbucket.org/petsc/petsc</a><br>
git checkout knepley/fix-plex-bc-multiple<br>
<br>
With this petsc version, ex46 and ex47 are not working (from TS),
and after calling PetscDSAddBoundary, it seems that the boundary
values are never inserted, as in my own code.<br>
<br>
Do i have the right petsc development version ?<br>
<br>
Thanks,<br>
<br>
Regards,<br>
<br>
Yann<br>
<br>
PS : In my old code, i've tried to mix ex56 and ex69 for marking
boundary values. <br>
I first set labels for "Faces", and using this label, i create new
separated ones (North, South, ...).<br>
It worked in sequential, but in parallel, the program hang at
DMPlexCreateClosureIndex.<br>
So i just kept "Faces", as in ex56, and it worked in parallel.<br>
<br>
<blockquote type="cite"
cite="mid:CAMYG4G=Mi_gfeu8aM-jMLx_Zxk1nyk69QOWOjKga1W2deO3GmQ@mail.gmail.com">
<div dir="ltr">
<div class="gmail_extra">
<div class="gmail_quote">
<div><br>
</div>
<div> Thanks,</div>
<div><br>
</div>
<div> Matt</div>
<div> </div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div class="m_2693683614766768657moz-cite-prefix">
Thanks,<br>
<br>
Regards,<span class=""><br>
<br>
Yann<br>
<br>
Le 22/11/2017 à 18:51, Matthew Knepley a écrit :<br>
</span></div>
<div>
<div class="h5">
<blockquote type="cite">
<div dir="ltr">
<div class="gmail_extra">
<div class="gmail_quote">On Wed, Nov 22,
2017 at 12:39 PM, Yann Jobic <span
dir="ltr"><<a
href="mailto:yann.jobic@univ-amu.fr"
target="_blank" moz-do-not-send="true">yann.jobic@univ-amu.fr</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex">Hello,<br>
<br>
I've found a strange behavior when
looking into a bug for the pressure
convergence of a simple Navier-Stokes
problem using PetscFE.<br>
<br>
I followed many examples for labeling
boundary faces. I first use
DMPlexMarkBoundaryFaces, (label=1 to the
faces).<br>
I find those faces using DMGetStratumIS
and searching 1 as it is the value of
the marked boundary faces.<br>
Finally i use DMPlexLabelComplete over
the new label.<br>
I then use :<br>
ierr = PetscDSAddBoundary(prob,
DM_BC_ESSENTIAL, "in", "Faces", 0,
Ncomp, components, (void (*)(void)) uIn,
NWest, west, NULL);CHKERRQ(ierr);<br>
in order to impose a dirichlet condition
for the faces labeled by the correct
value (west=1, south=3,...).<br>
<br>
However, the function "uIn()" is called
in all the Elements containing the
boundary faces, and thus impose the
values at nodes that are not in the
labeled faces.<br>
Is it a normal behavior ? I then have to
test the position of the node calling
uIn, in order to impose the good value.<br>
I have this problem for a Poiseuille
flow, where at 2 corner Elements i have
a zero velocity dirichlet condition
(wall) and a In flow velocity one.<br>
</blockquote>
<div><br>
</div>
<div>I believe I have fixed this in
knepley/fix-plex-bc-multiple which
should be merged soon. Do you know how
to merge that branch and try?</div>
<div><br>
</div>
<div> Thanks,</div>
<div><br>
</div>
<div> Matt</div>
<div> </div>
<blockquote class="gmail_quote"
style="margin:0 0 0 .8ex;border-left:1px
#ccc solid;padding-left:1ex"> The
pressure is then very high at the corner
nodes of those 2 Elements.<br>
Do you think my pressure problem comes
from there ? (The velocity field is
correct)<br>
<br>
Many thanks,<br>
<br>
Regards,<br>
<br>
Yann<br>
<br>
PS : i'm using those runtime options :<br>
-vel_petscspace_order 2
-pres_petscspace_order 1 \<br>
-ksp_type fgmres -pc_type fieldsplit
-pc_fieldsplit_type schur
-pc_fieldsplit_schur_fact_type full \<br>
-fieldsplit_velocity_pc_type lu
-fieldsplit_pressure_ksp_rtol 1.0e-10
-fieldsplit_pressure_pc_type jacobi<br>
<br>
<br>
---<br>
L'absence de virus dans ce courrier
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class="m_2693683614766768657gmail_signature"
data-smartmail="gmail_signature">
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<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="http://www.caam.rice.edu/%7Emk51/"
target="_blank"
moz-do-not-send="true">https://www.cse.buffalo.edu/~<wbr>knepley/</a><br>
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<div><br>
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-- <br>
<div class="gmail_signature"
data-smartmail="gmail_signature">
<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="http://www.caam.rice.edu/%7Emk51/"
target="_blank" moz-do-not-send="true">https://www.cse.buffalo.edu/~knepley/</a><br>
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