[Nek5000-users] turbJet problem

[nek5000-users at lists.mcs.anl.gov]

Hi Barak,

It is a problem with numerical Stability. Decrease DT  in your .rea file
until the simulations become stable. You could start with 1/2 DT to check
if simulation is stable, other wise go for 1/4 DT, and check with this
simple test.

Thanks,
Tanmoy


On Fri, Dec 6, 2013 at 3:31 PM, <nek5000-users at lists.mcs.anl.gov> wrote:

> Hello,
> I am testing the example turbJet, and it seems that I have some problem
> with output. This are the output files:
> jet0.f00001
>
> Moreover, the ran stops with emergency exit at time 5.64 (CFL too large?):
>
>
>         282  DNORM, DIVEX   6.2789891850172769E-004 8.4967723454134898E-006
>         282   5.6400E+00  1.1065E+01 Fluid done
>    282  5.6400000E+00  1.1955953E-03  6.4269380E-04  9.9999991E-01 e2
>  t max/min:   0.0000000000000000        0.0000000000000000
>  CFL, Ctarg!   22.504301079496056        2.0000000000000000
>  call outfld: ifpsco: T
>
>       283  5.6400E+00 Write checkpoint:
>        0     283 OPEN: jet0.f00001
>
>       283  5.6400E+00 done :: Write checkpoint
>                               file size =      55.    MB
>                               avg data-throughput =   572.1MB/s
>                               io-nodes =     1
>
>
>            7  Emergency exit:         283    time =   5.6399999999999677
>   Latest solution and data are dumped for post-processing.
>   *** STOP ***
>            3  Emergency exit:         283    time =   5.6399999999999677
>   Latest solution and data are dumped for post-processing.
>   *** STOP ***
>            5  Emergency exit:         283    time =   5.6399999999999677
>   Latest solution and data are dumped for post-processing.
>   *** STOP ***
>            0  Emergency exit:         283    time =   5.6399999999999677
>   Latest solution and data are dumped for post-processing.
>   *** STOP ***
>            6  Emergency exit:         283    time =   5.6399999999999677
>   Latest solution and data are dumped for post-processing.
>   *** STOP ***
>            4  Emergency exit:         283    time =   5.6399999999999677
>   Latest solution and data are dumped for post-processing.
>   *** STOP ***
>            2  Emergency exit:         283    time =   5.6399999999999677
>   Latest solution and data are dumped for post-processing.
>   *** STOP ***
>            1  Emergency exit:         283    time =   5.6399999999999677
>
>
>
>
> Thank you,
> Barak
>
>
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