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<p style="margin-top:0;margin-bottom:0">I think you're running out of memory.</p>
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</p>
<p style="margin-top:0;margin-bottom:0">In your SIZE file, increase lpmin.</p>
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</p>
<p style="margin-top:0;margin-bottom:0">You have (in SIZE) a max element count of lelg=10000.</p>
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</p>
<p style="margin-top:0;margin-bottom:0">If lpmin=1, then the code has to compile for 10000 elements per</p>
<p style="margin-top:0;margin-bottom:0">rank, which takes a lot of memory.</p>
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</p>
<p style="margin-top:0;margin-bottom:0">If you set lpmin=8, then the code will compile for 10000/8, meaning that the memory footprint is effectively 8 times smaller.</p>
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</p>
<p style="margin-top:0;margin-bottom:0">If you run 10,000 elements then you would need 8 MPI ranks in this case.</p>
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</p>
<p style="margin-top:0;margin-bottom:0">Note that if your mesh has only 5000 elements, you could run 4 MPI ranks.</p>
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</p>
<p style="margin-top:0;margin-bottom:0">I usually compile with lelg slightly larger than the number of elements in my mesh.</p>
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<p style="margin-top:0;margin-bottom:0">hth,</p>
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<p style="margin-top:0;margin-bottom:0">Paul</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Nek5000-users <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, January 16, 2018 9:48:56 PM<br>
<b>To:</b> nek5000-users@lists.mcs.anl.gov<br>
<b>Subject:</b> Re: [Nek5000-users] Nek5000-users Digest, Vol 107, Issue 24</font>
<div> </div>
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<div>
<div dir="ltr">Hey Paul,
<div><br>
</div>
<div><br>
</div>
<div>As suggested by you, I did look into the .usr of Rayleigh Benard Convection example and it did help me. But I face the following error while compiling using makenek. </div>
<div><br>
</div>
<div>
<div>obj/plan4.o: In function `plan4_':</div>
<div>plan4.f:(.text+0x1781): additional relocation overflows omitted from the output</div>
<div>collect2: error: ld returned 1 exit status</div>
<div>makefile:114: recipe for target 'nek5000' failed</div>
<div>make: *** [nek5000] Error 1</div>
</div>
<div><br>
</div>
<div>I have attached The SIZE file, .usr file,.par file and the .box file used for the simulation. Really appreciate your help.</div>
</div>
<div class="x_gmail_extra"><br>
<div class="x_gmail_quote">On Mon, Jan 15, 2018 at 11:30 PM, <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: Low-Density jet using low -Mach number formulation<br>
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Message: 1<br>
Date: Sun, 14 Jan 2018 21:00:59 +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>
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Subject: Re: [Nek5000-users] Low-Density jet using low -Mach number<br>
formulation<br>
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Dear Nitish,<br>
<br>
<br>
There are several examples of Rayleigh-Benard convection that show how to do buoyancy driven flows. Looking at those usr files would be a first step.<br>
<br>
<br>
hth,<br>
<br>
<br>
Paul<br>
<br>
<br>
______________________________<wbr>__<br>
From: Nek5000-users <<a href="mailto:nek5000-users-bounces@lists.mcs.anl.gov">nek5000-users-bounces@lists.<wbr>mcs.anl.gov</a>> on behalf of
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Sent: Sunday, January 14, 2018 8:08:20 AM<br>
To: <a href="mailto:nek5000-users@lists.mcs.anl.gov">nek5000-users@lists.mcs.anl.<wbr>gov</a><br>
Subject: [Nek5000-users] Low-Density jet using low -Mach number formulation<br>
<br>
Hello Nek Users,<br>
<br>
I want to simulate low density jet (heated air whose density is lesser than ambient air) expanding out from a pipe into stagnant air.<br>
I want to run a 2D planar case. Im planning to export the mesh from exodus II to nek. Can somebody guide me what I have to do from here? What Stress formulation to use? Thanks for the help.<br>
<br>
--<br>
Nitish Kovalam<br>
Aerospace Engineering<br>
Indian Institute of Space Science and Technology<br>
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<div class="x_gmail_signature">
<div dir="ltr">Nitish Kovalam
<div>Aerospace Engineering</div>
<div>Indian Institute of Space Science and Technology</div>
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