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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif">Hello NekGurus,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif"><o:p> </o:p></span></p>
<p class="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?<o:p></o:p></span></p>
<p class="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:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif">‘At line 70 of file re2torea.f<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif">Fortran runtime error: End of file.’<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif">With an empty .rea file.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif"><o:p> </o:p></span></p>
<p class="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.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif">Thank you very much,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif">Mario<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif">Mario R. Naranjo<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif">Computational Sciences and Engineering<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Cambria",serif">Los Alamos National Laboratory<o:p></o:p></span></p>
<p class="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<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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