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<p><br>
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<p>Hi Jian,</p>
<p><br>
</p>
<p>Have a look at the "pipe" example.</p>
<p><br>
</p>
<p>I would expect the total element count to be about 10,000-30,000</p>
<p>for well resolved pipe flow at Re=5300.</p>
<p><br>
</p>
<p>There is a README on how to construct the mesh.</p>
<p><br>
</p>
<p>Please let me know if that helps...</p>
<p><br>
</p>
<p>Paul</p>
<p><br>
</p>
</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> nek5000-users-bounces@lists.mcs.anl.gov <nek5000-users-bounces@lists.mcs.anl.gov> on behalf of nek5000-users@lists.mcs.anl.gov <nek5000-users@lists.mcs.anl.gov><br>
<b>Sent:</b> Tuesday, June 27, 2017 7:06:09 PM<br>
<b>To:</b> nek5000-users@lists.mcs.anl.gov<br>
<b>Subject:</b> Re: [Nek5000-users] Nek5000-users Digest, Vol 100, Issue 30</font>
<div> </div>
</div>
<div>
<div dir="ltr">Hi Paul,
<div><br>
</div>
<div>I changed the elements in the straight pipe which is I am doing at the moment. I set the horizontal and vertical axis as 14 spectral elements in the quarter-section for the simulation at Re=5300 based on bulk velocity. And the pipe length is 25R. Do you
think it's enough to run the simulation? By the way, I run the simulation for a short time, after which I used visit to check the mesh finding that there are several things inside the pipe which are likely to be walls. And I found the mesh in visit shows that
the cross-sectional views are different in the outlet and inlet which is open or closed. I set the axis view in visit to not show the axis. </div>
<div><br>
</div>
<div>Kind regards,</div>
<div><br>
</div>
<div>Jian</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On 27 June 2017 at 18:00, <span dir="ltr"><<a href="mailto:nek5000-users-request@lists.mcs.anl.gov" target="_blank">nek5000-users-request@lists.mcs.anl.gov</a>></span> wrote:<br>
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1. Re: Nek5000-users Digest, Vol 100, Issue 29<br>
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2. Re: Nek5000-users Digest, Vol 100, Issue 29<br>
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Message: 1<br>
Date: Mon, 26 Jun 2017 18:06:06 +0100<br>
From: <a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a><br>
To: <a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a><br>
Subject: Re: [Nek5000-users] Nek5000-users Digest, Vol 100, Issue 29<br>
Message-ID:<br>
<<a href="mailto:mailman.9646.1498496769.2967.nek5000-users@lists.mcs.anl.gov">mailman.9646.1498496769.2967.<wbr>nek5000-users@lists.mcs.anl.<wbr>gov</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Hi Paul,<br>
<br>
Now the number of total elements is 576000 written in the rea file. By the<br>
way, would you please tell me the reason why only 1/1000 number of elements<br>
are needed indeed with SEM.<br>
<br>
Kind regards,<br>
<br>
Jian<br>
<br>
<br>
> Message: 2<br>
> Date: Mon, 26 Jun 2017 15:27:28 +0000<br>
> From: <a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a><br>
> To: "<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a>"<br>
> <<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a>><br>
> Subject: Re: [Nek5000-users] genmap<br>
> Message-ID:<br>
> <<a href="mailto:mailman.9625.1498490850.2967.nek5000-users@lists.mcs.anl.gov">mailman.9625.1498490850.2967.<wbr>nek5000-users@lists.mcs.anl.<wbr>gov</a>><br>
> Content-Type: text/plain; charset="us-ascii"<br>
><br>
><br>
> Dear Jiang,<br>
><br>
><br>
> I think you have too many elements. Keep in mind that with the SEM you<br>
> need about 1/1000th of the number of elements that you would for FEM.<br>
><br>
><br>
> What is the largest SEM run you have made so far?<br>
><br>
><br>
> Best, Paul<br>
><br>
><br>
> ______________________________<wbr>__<br>
> From: <a href="mailto:nek5000-users-bounces@lists.mcs.anl.gov">nek5000-users-bounces@lists.<wbr>mcs.anl.gov</a> <<br>
> <a href="mailto:nek5000-users-bounces@lists.mcs.anl.gov">nek5000-users-bounces@lists.<wbr>mcs.anl.gov</a>> on behalf of<br>
> <a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a> <<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a>><br>
> Sent: Monday, June 26, 2017 8:49:06 AM<br>
> To: <a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a><br>
> Subject: [Nek5000-users] genmap<br>
><br>
> Hi Neks,<br>
><br>
> Is there anyone know the reason for the following error, in which there<br>
> are hundred millions of grid points in the geometry.<br>
><br>
> ABORT: NELT>LELM, modify LELM in SIZE and recompile<br>
><br>
> I changed the LELM to be big enough, even equals to 7000000000000, but it<br>
> doesn't work though. I guess the reasons would be:<br>
><br>
> 1. genmap cannot regonize large elements mesh;<br>
> 2. I didn't get a recompilation after changing LELM parameter since I<br>
> don't know how to compile and thought genmap commond would be changed<br>
> automatically when the SIZE file in /home/bin/genmap was changed.<br>
><br>
> Kind regards,<br>
><br>
> Jian<br>
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Message: 2<br>
Date: Mon, 26 Jun 2017 19:18:22 +0000<br>
From: <a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a><br>
To: "<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a>"<br>
<<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a>><br>
Subject: Re: [Nek5000-users] Nek5000-users Digest, Vol 100, Issue 29<br>
Message-ID:<br>
<<a href="mailto:mailman.9661.1498504705.2967.nek5000-users@lists.mcs.anl.gov">mailman.9661.1498504705.2967.<wbr>nek5000-users@lists.mcs.anl.<wbr>gov</a>><br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
<br>
Dear Jiang,<br>
<br>
<br>
If you run with lx1=10 you have 1000 points per element.<br>
<br>
<br>
FEM never runs with 10th order - the SEM is meant to do this.<br>
<br>
<br>
What is the largest SEM problem you have run so far? I recommend starting with a sequence of small ones just to get used to the workflow.<br>
<br>
<br>
Paul<br>
<br>
<br>
______________________________<wbr>__<br>
From: <a href="mailto:nek5000-users-bounces@lists.mcs.anl.gov">nek5000-users-bounces@lists.<wbr>mcs.anl.gov</a> <<a href="mailto:nek5000-users-bounces@lists.mcs.anl.gov">nek5000-users-bounces@lists.<wbr>mcs.anl.gov</a>> on behalf of
<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a> <<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a>><br>
Sent: Monday, June 26, 2017 12:06:06 PM<br>
To: <a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a><br>
Subject: Re: [Nek5000-users] Nek5000-users Digest, Vol 100, Issue 29<br>
<br>
Hi Paul,<br>
<br>
Now the number of total elements is 576000 written in the rea file. By the way, would you please tell me the reason why only 1/1000 number of elements are needed indeed with SEM.<br>
<br>
Kind regards,<br>
<br>
Jian<br>
<br>
Message: 2<br>
Date: Mon, 26 Jun 2017 15:27:28 +0000<br>
From: <a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a><mailto:<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@<wbr>lists.mcs.anl.gov</a>><br>
To: "<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a><mailto:<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@<wbr>lists.mcs.anl.gov</a>>"<br>
<<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a><mailto:<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@<wbr>lists.mcs.anl.gov</a>>><br>
Subject: Re: [Nek5000-users] genmap<br>
Message-ID:<br>
<<a href="mailto:mailman.9625.1498490850.2967.nek5000-users@lists.mcs.anl.gov">mailman.9625.1498490850.2967.<wbr>nek5000-users@lists.mcs.anl.<wbr>gov</a><mailto:<a href="mailto:mailman.9625.1498490850.2967.nek5000-users@lists.mcs.anl.gov">mailman.9625.<wbr>1498490850.2967.nek5000-users@<wbr>lists.mcs.anl.gov</a>>><br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
<br>
Dear Jiang,<br>
<br>
<br>
I think you have too many elements. Keep in mind that with the SEM you need about 1/1000th of the number of elements that you would for FEM.<br>
<br>
<br>
What is the largest SEM run you have made so far?<br>
<br>
<br>
Best, Paul<br>
<br>
<br>
______________________________<wbr>__<br>
From: <a href="mailto:nek5000-users-bounces@lists.mcs.anl.gov">nek5000-users-bounces@lists.<wbr>mcs.anl.gov</a><mailto:<a href="mailto:nek5000-users-bounces@lists.mcs.anl.gov">nek5000-<wbr>users-bounces@lists.mcs.anl.<wbr>gov</a>> <<a href="mailto:nek5000-users-bounces@lists.mcs.anl.gov">nek5000-users-bounces@lists.<wbr>mcs.anl.gov</a><mailto:<a href="mailto:nek5000-users-bounces@lists.mcs.anl.gov">nek5000-<wbr>users-bounces@lists.mcs.anl.<wbr>gov</a>>>
on behalf of <a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a><mailto:<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@<wbr>lists.mcs.anl.gov</a>> <<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a><mailto:<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@<wbr>lists.mcs.anl.gov</a>>><br>
Sent: Monday, June 26, 2017 8:49:06 AM<br>
To: <a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a><mailto:<a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@<wbr>lists.mcs.anl.gov</a>><br>
Subject: [Nek5000-users] genmap<br>
<br>
Hi Neks,<br>
<br>
Is there anyone know the reason for the following error, in which there are hundred millions of grid points in the geometry.<br>
<br>
ABORT: NELT>LELM, modify LELM in SIZE and recompile<br>
<br>
I changed the LELM to be big enough, even equals to 7000000000000, but it doesn't work though. I guess the reasons would be:<br>
<br>
1. genmap cannot regonize large elements mesh;<br>
2. I didn't get a recompilation after changing LELM parameter since I don't know how to compile and thought genmap commond would be changed automatically when the SIZE file in /home/bin/genmap was changed.<br>
<br>
Kind regards,<br>
<br>
Jian<br>
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