[Paraview] NEK5000 with ParaView

Wed Mar 5 06:04:08 EST 2014

Hi Sam,

Thanks for offering the help.

I looked at the case file you sent, NEK5000 also has a similar ASCII meta
file and time-depended mesh data is saved in a set of binary files. I am
not able to read this changing mesh into Paraview.

I have been using Paraview to visualize moving-mesh which are saved in VTK
format for quite sometime and it was working fine. But not able to do the
same with NEK5000 output files. I am guessing that this is still a
bug/pending enhancement since Paraview has added the NEK5000 compatibility
only recently, starting from 4.1.0.

Regards,
Ravi

On Sun, Mar 2, 2014 at 1:45 PM, Samuel Key <samuelkey at bresnan.net> wrote:

>  Giuseppe, Ravi;
>
> I have no knowledge of NEK-5000, nor the content of the results files
> produced by NEK-5000. However, in my use of ParaView, ParaView routinely
> provides moving and distorting meshes in my animations. For me, there are
> at least two ways that the moving and distorting meshes are produced:
>
> 1) If there are vector displacement values supplied at the grid points,
> and ParaView's Warp filter is available (that is, not grayed-out), then the
> Warp filter will can be used with a scale value to reduce, amplify, or give
> true position of the grid,
>
> 2) If one uses the EnSight-formatted simulation results file, and
> true-scale deformed mesh plots are the routine case, then EnSight's *.geom
> file can contain by time-step the mesh coordinates, and then without the
> use of ParaView's Warp filter, true-scale deformed meshes are obtained
> automatically. A small EnSight *.case file (an ASCII-formatted meta file
> the points to all of the binary files that contain the simulation results)
> is attached.
>
> Sam Key
>
>
>
> On 3/2/2014 9:16 AM, Ravi Tumkur wrote:
>
>     Hello Giuseppe,
>
>  Thanks a lot for replying to my query.
>
>  I understand that you are also facing the same issue of only one
> time-step's mesh geometry begin loaded when you try to use Paraview 4.1.0
> to visualize your post-processed data.
>
>  When you say using Praview 4.1.0 resolved your issue at the beginning of
> your email, do you mean you were able to visualize *.fld* data in Paraview?
> If so, can you please send an example database set and the metadata file?
>
>  I am trying to visualize moving-mesh results for the basic problem of
> vortex-shedding past a cylinder moving with prescribed motion. The flow
> results are rendered as expected in Paraview for each time step, but the
> mesh appears stationary, corresponding to "firsttimestep", as you also
> observe too.
>
>  I appreciate your help, a set to example database will get me started on
> using Paraview for visualizing NEK-5000 data.
>
>
>  Regards
> Ravi
>
>
>
>
>
> On Sat, Mar 1, 2014 at 2:45 AM, Giuseppe Pitton <giuseppe.pitton at gmail.com
> > wrote:
>
>> Hello Ravi,
>> although Paraview 4.1.0 solved my issue, now I am experiencing the same
>> problem you report with some postprocessed data (but I have a fixed mesh).
>> In my opinion this happens when the dataset has mesh information stored on
>> each .f or .fld file. I think Paraview expects to have mesh information
>> only in the first file of the dataset, and it is not behaving well if this
>> is not the case.
>> I suspect this because if I edit my .nek5000 file and change the value
>> of firsttimestep setting it to n, then Paraview correctly visualizes the
>> data of the n-th time step, but again it cannot display correctly the data
>> of the following timesteps.
>> I also can share some example dataset if it can help.
>> Best regards,
>> Giuseppe
>>
>>
>>
>>  Il giorno 28/feb/2014, alle ore 12:40, Ravi Tumkur ha scritto:
>>
>>    Hello Patrick and Giuseppe,
>>
>>  I am also facing the same issue as Giuseppe did on visualizing the
>> NEK5000 solution data. I have simulated a moving boundary problem using
>> NEK5000, and have the output saved in *.fld* format. When I load the meta
>> file to read the files in Paraview, only one time-step mesh geometry is
>> loaded, whereas the field results of all the time-steps are available in
>> Paraview.
>>
>>  I would appreciate if either of you could suggest any workaround to read
>> the moving mesh geometry which is saved for each time-step of the solution.
>>
>>  I am trying to read my NEK5000 output in version 4.1.0 64-bit Paraview
>> installation. If you want the data files, please let me know, I can send
>> them across.
>>
>>  Thanks in advance for you help.
>>
>>  Sincerely,
>>  Ravi
>>
>>
>>
>>
>>
>> On Mon, Jan 20, 2014 at 10:44 AM, Patrick O'Leary <
>> patrick.oleary at kitware.com> wrote:
>>
>>>   Dear Giuseppe,
>>>
>>>  Yes I remember the issue. I have a test data set, and I just tested it.
>>> It works with version 4.1. Send me your data set and I'll look at what we
>>> might have missed.
>>>
>>>  Best regards,
>>>  Patrick
>>>
>>>
>>> On Mon, Jan 20, 2014 at 8:37 AM, Giuseppe Pitton <
>>> giuseppe.pitton at gmail.com> wrote:
>>>
>>>> Dear Patrick,
>>>> I am a ParaView user, and I am experiencing some issues with NEK5000
>>>> output format, both with the 4.0.1 and the 4.1 version.
>>>> I have found a user already reported this bug, but I have not found any
>>>> solution online. The problem is that only the first timestep is visualized,
>>>> and not the following ones. If you want, I could send you an example output
>>>> (few Mb).
>>>> Thank you in advance, best regards.
>>>> Giuseppe Pitton
>>>
>>>
>>>
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>>
>>
>> --
>> Ravi Kumar T R
>>
>> University of Illinois at Urbana-Champaign
>> ph : +1 217 778 7538 <%2B1%20217%20778%207538>
>> http://lndvl.mechse.illinois.edu/
>>
>>
>>
>
>
> --
> Ravi Kumar T R
>
> University of Illinois at Urbana-Champaign
> ph : +1 217 778 7538
> http://lndvl.mechse.illinois.edu/
>
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the ParaView Wiki at: http://paraview.org/Wiki/ParaView
>
> Follow this link to subscribe/unsubscribe:http://www.paraview.org/mailman/listinfo/paraview
>
>
>
> _______________________________________________
> Powered by www.kitware.com
>
> Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
>
> Please keep messages on-topic and check the ParaView Wiki at:
> http://paraview.org/Wiki/ParaView
>
> Follow this link to subscribe/unsubscribe:
> http://www.paraview.org/mailman/listinfo/paraview
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>

-- 
Ravi Kumar T R

University of Illinois at Urbana-Champaign
ph : +1 217 778 7538
http://lndvl.mechse.illinois.edu/
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