Data manipulation of variables from two simulations, same mesh

Eren10 · July 3, 2012, 04:58

Hi,

is it readily possible to do simple calculations (substract, add..) variables like the pressure from two ( or more) different simulations ? The meshes are the same.

I can do this by using p files but then I have to change the text in files and I need to this for a lot of simulations.

lovecraft22 · July 3, 2012, 05:46

Have you tried loading both the simulations in paraview and using the calculator?

Eren10 · August 6, 2012, 06:52

Quote:

Originally Posted by lovecraft22

Have you tried loading both the simulations in paraview and using the calculator?

I have to this for over the hundred simulations so I do not think that will solve my problem. Maybe I should delete the texts in files (p,U) and then use the values. Sorry for the late response.

wyldckat · August 6, 2012, 07:06

Greetings to all!

The way I see it, you've got at least a few options:

pvbatch - it's ParaView's python based batch system. Search for pvbatch here in the forum for more information. Additionally, you can use ParaView's "Python Trace" feature for getting the base script.
PyFoam - I'm not sure on this one... all I know is that it's a very awesome toolkit to have with OpenFOAM
Modify foamCalc for handling data from more than one mesh... although it's not that easy to do, I think
The mapFields utility would be a good reference on handling more than one case folder.
Create a script that:
1. Copies the reference case to a sandbox folder.
2. Copies the fields from a second case, using different field names, to the sandbox folder.
3. Run foamCalc over the fields.
4. And so on...

Best regards,
Bruno

July 3, 2012, 04:58	Data manipulation of variables from two simulations, same mesh	#1
Eren10 Member The True Join Date: Dec 2010 Posts: 80 Rep Power: 15	Hi, is it readily possible to do simple calculations (substract, add..) variables like the pressure from two ( or more) different simulations ? The meshes are the same. I can do this by using p files but then I have to change the text in files and I need to this for a lot of simulations.

August 6, 2012, 07:06		#4
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,974 Blog Entries: 45 Rep Power: 128	Greetings to all! The way I see it, you've got at least a few options: pvbatch - it's ParaView's python based batch system. Search for pvbatch here in the forum for more information. Additionally, you can use ParaView's "Python Trace" feature for getting the base script. PyFoam - I'm not sure on this one... all I know is that it's a very awesome toolkit to have with OpenFOAM Modify foamCalc for handling data from more than one mesh... although it's not that easy to do, I think The mapFields utility would be a good reference on handling more than one case folder. Create a script that: Copies the reference case to a sandbox folder. Copies the fields from a second case, using different field names, to the sandbox folder. Run foamCalc over the fields. And so on... Best regards, Bruno __________________ OpenFOAM: FAQ \| Getting started Forum: How to get help, to post code/output and forum guide Read this before sending me PM

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July 3, 2012, 05:46		#2
lovecraft22 Senior Member lore Join Date: Mar 2010 Location: Italy Posts: 460 Rep Power: 18	Have you tried loading both the simulations in paraview and using the calculator?