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<p>Thanks very much Paul.</p>
<p><br>
</p>
<p>Sincerely,<br>
NN.<br>
</p>
<br>
<div class="moz-cite-prefix">On Monday 06 November 2017 01:30 PM,
<a class="moz-txt-link-abbreviated" href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a> wrote:<br>
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<p>Dear NN,</p>
<p><br>
</p>
<p>If your flow is turbulent the answer is definitely Yes (they
will be different) because of the standard sensitivity to
initial condition concerns.</p>
<p><br>
</p>
<p>Despite this, both schemes are O(dt^k) accurate, meaning
that as dt-->0, the error goes to _zero_ as dt^k, where
k=Torder is the prescribed temporal order. Since the error
goes to zero, both will deliver the same answer provided that
the physical solution is stable and has an attractor.
[Understanding when such conditions prevail is often a
challenge.]</p>
<p><br>
</p>
<p>Paul</p>
<p><br>
</p>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt"
color="#000000" face="Calibri, sans-serif"><b>From:</b>
Nek5000-users <a class="moz-txt-link-rfc2396E" href="mailto:nek5000-users-bounces@lists.mcs.anl.gov"><nek5000-users-bounces@lists.mcs.anl.gov></a>
on behalf of <a class="moz-txt-link-abbreviated" href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a>
<a class="moz-txt-link-rfc2396E" href="mailto:nek5000-users@lists.mcs.anl.gov"><nek5000-users@lists.mcs.anl.gov></a><br>
<b>Sent:</b> Monday, November 6, 2017 6:13:11 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.gov</a><br>
<b>Subject:</b> [Nek5000-users] IFCHAR option in rea file</font>
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<div class="BodyFragment"><font size="2"><span
style="font-size:10pt;">
<div class="PlainText">Hello,<br>
<br>
I have been using IFCHAR = TRUE in my simulations. The
CFL number is <br>
around<br>
1.2 and the computations appear to go on nicely. I would
like to know<br>
if the flow field computed using IFCHAR=TRUE option is
different than the<br>
one obtained with IFCHAR=FALSE (albeit with smaller dt)?
If yes, can the <br>
difference<br>
be significant?<br>
<br>
Many thanks,<br>
NN<br>
<br>
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