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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">My apologies upfront for any simple misconceptions as I'm new to nek.<br>
<br>
I have successfully run the included 2d RB example and thought things looked reasonable. I then changed the mesh to an aspect ratio 2, 4x8 element mesh and modified the boundary conditions to be 'SYM' sidewalls and 'SYM' (free-slip) for the top and bottom
velocity (see attached rea and map file).<br>
<br>
Without changing anything else from the example (I did not modify SIZE) the velocities appear to blow up, and I get a series of errors like the following in the logfile:<br>
<br>
1 100 **ERROR**: Failed in HMHOLTZ: TEMP 1.4999E-02 3.7064E+01 2.4836E-03<br>
1 2.0000E-02 6.0370E-03 Heat done<br>
<br>
1 100 **ERROR**: Failed in HMHOLTZ: VELX 2.8743E-21 1.7086E-16 2.3416E-23<br>
0.000000000000000E+000 p22 1 1<br>
New CG1-tolerance (RINIT*epsm) = 1.010379228335448E-010<br>
2.341589846098494E-023<br>
<br>
<br>
1 100 **ERROR**: Failed in HMHOLTZ: VELY 1.0837E-01 1.0104E+03 1.0104E-10<br>
New CG2-tolerance (RINIT*10-5/10-10) = 2.795810823528297E-003<br>
3.472834773690102E-025<br>
<br>
<br>
<br>
Do I need to adjust the tolerances because the mesh/BCs are different?<br>
<br>
<br>
I don't think it matters, but I ran this on 16 procs (there are 16 per node on the machine I'm using).<br>
<br>
-Jared<br>
<div><br>
<div style="font-family:Tahoma; font-size:13px">CCS2/CNLS Postdoctoral Research Associate
<div>Los Alamos National Laboratory</div>
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