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<p style="margin-top:0;margin-bottom:0">Hi Mario,</p>
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<p style="margin-top:0;margin-bottom:0">Please contact me offline at obabko@mcs.anl.gov</p>
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<p style="margin-top:0;margin-bottom:0">Aleks<br>
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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> Monday, July 9, 2018 12:47:15 PM<br>
<b>To:</b> nek5000-users@lists.mcs.anl.gov<br>
<b>Subject:</b> [Nek5000-users] CFL's impact on data & 3D without .rea</font>
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<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif">Hello NekGurus,</span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif"> </span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif">I have been studying Nek5000 this summer as part of a project investigating it’s viability as a replacement/alternative to other commercial codes. My two test cases, natural
circulation & convective pipe flow, are producing nice results with the only issue being a ‘WARNING: DIV(V)-QTL too large!’ after X time steps. I’ve increased my targetCFL, from 0.4 to 4.0, and changed dt from variable to fixed. This has eliminated the
warning, at the cost of a longer runtime. My first question is; will the changes to the CFL value effect the accuracy of temperature or velocity results?</span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif">Second, I would like to expand one (or both) of the cases to 3d, do I need to create .rea file to do this, or is it better to import a 3d .STEP file? I’ve tried using n2to3
and re2torea, but the later outputs the following:</span></p>
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<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif">‘At line 70 of file re2torea.f</span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif">Fortran runtime error: End of file.’</span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif"> </span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif">With an empty .rea file.</span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif"> </span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif">It is my impression that the .rea file is no longer necessary. Is this incorrect? Please advise on the best way to proceed.</span></p>
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<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif">Thank you very much,</span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif"> </span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif">Mario</span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif"> </span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif">Mario R. Naranjo</span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif"> </span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif">Computational Sciences and Engineering</span></p>
<p class="x_MsoNormal"><span style="font-size:12.0pt; font-family:"Cambria",serif">Los Alamos National Laboratory</span></p>
<p class="x_MsoNormal"><u><span style="font-size:12.0pt; font-family:"Cambria",serif; color:blue"><a href="mailto:naranjom@lanl.gov"><span style="color:blue">naranjom@lanl.gov</span></a></span></u><span style="font-size:12.0pt; font-family:"Cambria",serif">
| W: 505-664-0978 | M: 505-980-4187</span></p>
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