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-   -   Difference between 2 timesteps (https://www.cfd-online.com/Forums/openfoam-post-processing/69725-difference-between-2-timesteps.html)

makaveli_lcf November 2, 2009 10:59

Difference between 2 timesteps
 
Hallo!

I'm trying to display in ParaView difference between fields values corresponding to 2 different time steps. I didn't find any solution. Would any one please give some tips how to do this. I found how to create shifted in time data using Time Shift Scale filter, but can not find easy way how to subtract those shifted values from current and display that.

I would really appreciate your help!
Best regards

t.oliveira November 18, 2017 17:33

Hi,

I wasn't able to do that using the Time Shift Scale filter either.

Now, there is another solution. ParaView 5.4.0 introduced a new filter called Temporal Array Operator that makes it easy to calculate the difference between field values corresponding to two different time steps.

Best regards,
Thomas

makaveli_lcf November 20, 2017 04:13

Hi Thomas,

thank you for the great tip, I will try it! Currently I was saving ddt(some_field) in my solver. Of course it is not a solution for the standard solvers of for old results.

Cheers,
Alexander


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