[Paraview] Coprocessing with many time steps

[Andy Bauer]

Hi,

The XML readers and writers don't properly support time so currently the
best way would be to create a pvd file which would contain the time and
time step information. I don't know of anything in VTK or ParaView that
writes out pvd files (I only see a vtkPVDReader in ParaView) but the format
is meant to be simple. I would suggest doing it directly in the Catalyst
Python script through some Python library as the best workaround for now.



On Thu, Sep 28, 2017 at 3:08 PM, Hermano Lustosa <hllustosa at gmail.com>
wrote:

> Ohh I see...
>
> Just another quick question. Currently, I am creating a series of VTU and
> VTI files whose names follow the pattern mysimulation-t%d. With %d being
> replaced by an integer index identifying the time step. I am about to code
> a simple PVD writer to consolidate the output and also to assign the real
> time step value in seconds instead of maintaining this integer index.
>
> It doesn't seem to be very hard to create this PVD file by hand, but I was
> just wondering if there is something in the VTK library that could
> automatically create these files for me. I still could not understand how I
> can assign the real time step in seconds to a file, don't know if its even
> possible with VT? files. If this is possible, some directions that could
> help me implement that would be very nice!
>
> Thanks once again!
>
>
>
>
>
> On Thu, Sep 28, 2017 at 3:50 PM, Andy Bauer <andy.bauer at kitware.com>
> wrote:
>
>> Hi,
>>
>> The TemporalStatistics filter (or any other filter that iterates through
>> time steps) doesn't currently work with Catalyst. We hope to change this in
>> the future but because of the way that the ParaView pipeline works it makes
>> it a non-trivial change.
>>
>> Andy
>>
>> On Thu, Sep 28, 2017 at 2:40 PM, Hermano Lustosa <hllustosa at gmail.com>
>> wrote:
>>
>>> I have doubt about using paraview catalyst from my simulation code.
>>> Suppose I created a simple Paraview pipeline containing the
>>> TemporalStatistics filter only.
>>>
>>> Initially, it is not clear for which "dummy" source is adequate for the
>>> script. I used a simple programmable source or even a unstructured cell
>>> types source to create the python script. Then, I call the script from
>>> catalyst in my code like this:
>>>
>>> for each time step
>>>     update grid;
>>>     create data description;
>>>     call coprocessing method;
>>>
>>> The problem is that I expect the TemporalStatistics filter to create a
>>> single file containing the statistics for all the time steps. However, this
>>> approach creates a file for every time step. What I should do in the
>>> catalyst (or during the script creation) to have a single output for this
>>> filter.
>>>
>>> Thanks in advance.
>>>
>>>
>>>
>>>
>>>
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