[General] How to use caluculator with different case data in paraview

gmori · January 14, 2023, 04:32

Hello all, I have a question.
I am using OpenFOAM to perform an analysis and visualize the results in paraview.

What I want to do is to create two cases (case1 and case2) with exactly the same model geometry and mesh geometry, but with different conditions regarding temperature, and output the temperature distribution of case1 minus that of case2.

Is it possible to use data from different cases in the paraview calculator?
I would like to know if anyone can tell me how to do this.

tomf · January 16, 2023, 08:05

Hi,

You can use the python calculator for this task.

Your expression would look like this:

Code:

inputs[0].PointData['T'] - inputs[1].PointData['T']

Or use CellData if you prefer.

Where both datasets that you want to work on must be selected as inputs to the filter.

I typically always check the fields themselves to know which is input 0 and which input 1, because that may not always be obvious.

Good luck,
Tom

gmori · January 16, 2023, 13:08

Thank you for reply!!

I will try to use python calculator.

January 14, 2023, 04:32	How to use caluculator with different case data in paraview	#1
gmori New Member mo Join Date: May 2022 Posts: 24 Rep Power: 3	Hello all, I have a question. I am using OpenFOAM to perform an analysis and visualize the results in paraview. What I want to do is to create two cases (case1 and case2) with exactly the same model geometry and mesh geometry, but with different conditions regarding temperature, and output the temperature distribution of case1 minus that of case2. Is it possible to use data from different cases in the paraview calculator? I would like to know if anyone can tell me how to do this.

January 16, 2023, 08:05		#2
tomf Senior Member Tom Fahner Join Date: Mar 2009 Location: Breda, Netherlands Posts: 634 Rep Power: 32	Hi, You can use the python calculator for this task. Your expression would look like this: Code: inputs[0].PointData['T'] - inputs[1].PointData['T'] Or use CellData if you prefer. Where both datasets that you want to work on must be selected as inputs to the filter. I typically always check the fields themselves to know which is input 0 and which input 1, because that may not always be obvious. Good luck, Tom

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January 16, 2023, 13:08		#3
gmori New Member mo Join Date: May 2022 Posts: 24 Rep Power: 3	Thank you for reply!! I will try to use python calculator.