[Nek5000-users] turbJet problem
nek5000-users at lists.mcs.anl.gov
nek5000-users at lists.mcs.anl.gov
Sun Dec 8 13:26:55 CST 2013
Hi Tanmoy,
I have divided by 4 and again my run stopped at iteration 1200. My
question is: does nek5000 have variable time-stepping?
Thanks,
Barak
On 12/07/2013 08:37 PM, nek5000-users at lists.mcs.anl.gov wrote:
> Hi Barak,
>
> it is because of the fact that the generated file format is probably not
> readable in visit. In the *usrchk* subroutine in your .usr file write
> these 2 lines
> param(66) = 4
> param(67) = 4
>
> before the end of the routine
>
> Then compile and execute your program. Now you will get output files in
> the form of turbJet.fld001, turbJet.fld002, ...and so on.
> type in visnek turbJet in your terminal, and generate *turbJet.nek5000*.
> This .nek5000 file can be read by visit.
>
> Thanks,
> Tanmoy
>
>
> On Sat, Dec 7, 2013 at 10:33 AM, <nek5000-users at lists.mcs.anl.gov
> <mailto:nek5000-users at lists.mcs.anl.gov>> wrote:
>
> Hi Tanmoy,
> Many thanks. It seems that after dividing by 4 (dt=0.005) it runs
> and I get output files in the form jet0.fxxxxx .
> Now I am trying to visualize them using the precompiled ubuntu11
> version of visit. Unfortunately, I get the following error:
>
> VisIt could not read from the file
> "/home/galanti/COMPUTATION/__NEK5000/nek5_svn/TEST-__examples/turbJet/jet0.f*
> database".
>
> The generated error message was:
>
> There was an error opening
> /home/galanti/COMPUTATION/__NEK5000/nek5_svn/TEST-__examples/turbJet/jet0.f*
> database. It may be an invalid file. VisIt tried using the
> following file format readers to open the file: Nek5000
>
> The following error(s) may be helpful in identifying the problem:
> When attempting to use "Nek", the file matched the general format
> expected by the reader but eventually encountered this error: "A tag
> called filetemplate: must be specified".
>
> What's wrong?
> Many thanks again,
> Barak
>
>
>
> On 12/07/2013 12:42 AM, nek5000-users at lists.mcs.anl.__gov
> <mailto:nek5000-users at lists.mcs.anl.gov> wrote:
>
> 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
> <mailto:nek5000-users at lists.mcs.anl.gov>
> <mailto:nek5000-users at lists.__mcs.anl.gov
> <mailto: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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