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Hi, Matt:<br>
Thank your for your reply, and it is what I needed.<br>
<br>
leejearl<br>
<br>
<br>
<div class="moz-cite-prefix">On 2016年10月28日 21:08, Matthew Knepley
wrote:<br>
</div>
<blockquote
cite="mid:CAMYG4GnqmJjXHhiqp+QsAJEyCLcg4kU3pBngu3GqH9BZD=zLXA@mail.gmail.com"
type="cite">
<div dir="ltr">
<div class="gmail_extra">
<div class="gmail_quote">On Fri, Oct 28, 2016 at 8:05 AM,
leejearl <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:leejearl@126.com" target="_blank">leejearl@126.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div> Hi, Matt:<br>
Thank you for your help. It is the answer which I
expect. <br>
But， I have an another equestion. Can I obtain the
coordinates of the ghost cells:<br>
</div>
</blockquote>
<div><br>
</div>
<div>I am not sure I understand. By default, Plex stores
coordinates only for vertices. Also, ghost cells</div>
<div>do not have a full complement of vertices because they
are only used to define a state on the other</div>
<div>side of a face. Does that make sense?</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">
<div> Thanks,<br>
<br>
leejearl<br>
<br>
<div class="m_7510602955081850294moz-cite-prefix">On
2016年10月28日 19:56, Matthew Knepley wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div class="gmail_extra">
<div class="gmail_quote">On Fri, Oct 28, 2016 at
6:32 AM, leejearl <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:leejearl@126.com"
target="_blank">leejearl@126.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">Hi,
everyone:<br>
<br>
I have a distributed DMPlex representing a
2D finite volume mesh. I distributed it using
the function "DMPlexDistribute()".<br>
<br>
Then, I constructed the ghost cells using
"DMPlexConstructGhostCells()".<br>
<br>
The question is that I want to determine
which cell is ghosted. I obtained all the
cells using "DMPlexGetHeightStratum()", and<br>
<br>
how can I kown which cell is ghosted?<br>
</blockquote>
<div><br>
</div>
<div>1) The ghost cells are marked as "hybrid",
so you can call</div>
<div><br>
</div>
<div> ierr = DMPlexGetHybridBounds(dm,
&cEndInterior, NULL, NULL,
NULL);CHKERRQ(ierr);</div>
<div>
<div> ierr = DMPlexGetHeightStratum(dm, 0,
NULL, &cEnd);CHKERRQ(ierr);</div>
</div>
<div><br>
</div>
<div>and then the ghost cells are [cEndInterior,
cEnd).</div>
<div><br>
</div>
<div>2) There is also a label "ghost" which
marks the ghost faces, and ghost cells which
are non-local</div>
<div><br>
</div>
<div> Thanks,</div>
<div><br>
</div>
<div> Matt</div>
<div> </div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex"> Thanks,
all the helps are appreciated.<span
class="m_7510602955081850294gmail-HOEnZb"><font
color="#888888"><br>
<br>
<br>
leejearl<br>
<br>
<br>
<br>
</font></span></blockquote>
</div>
<br>
<br clear="all">
<span class="HOEnZb"><font color="#888888">
<div><br>
</div>
-- <br>
<div
class="m_7510602955081850294gmail_signature">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>
</font></span></div>
</div>
</blockquote>
<br>
</div>
</blockquote>
</div>
<br>
<br clear="all">
<div><br>
</div>
-- <br>
<div class="gmail_signature" data-smartmail="gmail_signature">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>
</div>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
李季
西北工业大学航空学院流体力学系
Phone: 17792092487
QQ: 188524324
</pre>
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