[Nek5000-users] turbJet problem

Sat Dec 7 12:37:17 CST 2013

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> 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 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>> 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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