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Wouldn't it make the most sense to do it in a variationally
consistent manner<br>
<br>
rhs_a = int{ N_a delta(x - x_o) }<br>
<br>
where x_o is the location of the point source?<br>
<br>
-sanjay<br>
<br>
<div class="moz-cite-prefix">On 4/13/18 7:46 PM, Matthew Knepley
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAMYG4G=ttfvCwRKs==SChdDCUZdt=XuTmY1GzqiR7A+bEyQ+sg@mail.gmail.com">
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<div class="gmail_extra">
<div class="gmail_quote">On Fri, Apr 13, 2018 at 1:40 PM,
Robert Walker <span dir="ltr"><<a
href="mailto:rlwalker@usc.edu" target="_blank"
moz-do-not-send="true">rlwalker@usc.edu</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>Hello,</div>
<div><br>
</div>
<div>Is there an example of application of a point
source in one of the tutorial PETScFE style examples?
Ideally this would be some point on the interior, and
not necessarily on a boundary.</div>
<div><br>
Thanks, and apologies in advance if this is a stupid
question,</div>
</div>
</blockquote>
<div><br>
</div>
<div>No, good question. You would have to decide what that
meant in FEM terms. All the internal integrals are done</div>
<div>with quadrature. So putting the source at a quadrature
point would work, although its a little difficult to know
where</div>
<div>they will be. You could smooth it out a little, and
check coordinates in the forcing function. Last, you could
check</div>
<div>for a "close enough" quadrature point and put it there.
I think making a slightly extended source is usually best.</div>
<div><br>
</div>
<div> Thanks,</div>
<div><br>
</div>
<div> Matt</div>
<div> </div>
<blockquote class="gmail_quote" style="margin:0 0 0
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<div>Robert </div>
<div><br>
</div>
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<div>
<div class="m_2490555387741070381gmail_signature"
data-smartmail="gmail_signature">
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<div>Robert L. Walker<br>
</div>
<div>MS Petroleum Engineering</div>
<div>Mork Family Department of Chemicals and
Materials Sciences<br>
</div>
<div>University of Southern California<br>
------------------------------<wbr>----------------<br>
</div>
<div>Mobile US: +1 (213) - 290 -7101<br>
</div>
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<div><a href="mailto:rlwalker@usc.edu"
target="_blank" moz-do-not-send="true">rlwalker@usc.edu</a><br>
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<br>
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<div><br>
</div>
-- <br>
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<div>
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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/~knepley/</a><br>
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</blockquote>
<br>
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