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Hi Xu,
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<div> Did you use genbox to build this case?</div>
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<div>You need BCs on all 4 sides ... </div>
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<div>Paul</div>
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<div id="divRpF200562" style="direction: ltr;"><font face="Tahoma" size="2" 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> Friday, January 22, 2016 12:56 AM<br>
<b>To:</b> nek5000-users@lists.mcs.anl.gov<br>
<b>Subject:</b> [Nek5000-users] error in generalev<br>
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<span lang="EN-US">Hello Nek,</span></p>
<p class="MsoNormal" style="margin-right:21.0pt; text-indent:21.0pt"><span lang="EN-US">I just met a trouble in running the case ‘high_ray’ In ‘benard’. I changed the original 2X1 calculation field into a 1x1 cavity, and when I ran the case, the error message
 ‘error in generalev’ appeared on the screen. All elements of the matrix ‘Aeig’ were ‘NaN’. I guess that I made some mistakes in the .usr file, maybe wrong B.C., but I’m not sure. I hope I can get some help from you. Thank you!</span></p>
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<span lang="EN-US">Kind regards</span></p>
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<span lang="EN-US">Xu Bolun </span></p>
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