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General understanding of postprocessing in paraFoam

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Old   October 15, 2015, 05:38
Default General understanding of postprocessing in paraFoam
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Hi everyone,

I want to get values out of my simulations for a mesh-independence study. No problem:
1. Insert a slice
2. Insert a Filter "Integrate variables"
3. Attribute "Cell Data"

1. As far as I understood, I have to divide the value by the area at that position, is that correct?
2. The pressure, that is defined in 0/p and given in paraFoam in the filter e.g. is the relative static pressure, right?
3. Do I have to multiply that pressure with density to receive the correct pressure?

Sorry for these basic questions, but I do not want to make stupid mistakes!
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Old   October 16, 2015, 05:10
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Tom Fahner
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Hi,

Let me respond to your questions:

Quote:
1. As far as I understood, I have to divide the value by the area at that position, is that correct?
2. The pressure, that is defined in 0/p and given in paraFoam in the filter e.g. is the relative static pressure, right?
3. Do I have to multiply that pressure with density to receive the correct pressure?
1. If you want to have the average over the area: yes. You can actually do this by using the calculator filter after the integrate variables filter (there should be a variable "Area")
2. If you are running an incompressible solver: yes. You can also find it in the dimensions of your 0/p file. If it reads [0 2 -2 0 0 0 0] you have kinematic pressure (pressure divided by density). If it reads [1 -1 -2 0 0 0 0] you have absolute pressure. OpenFOAM uses relative pressure in incompressible cases, but absolute pressure in compressible cases.
3. (Like in 2.): yes if incompressible

Regards,
Tom
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Old   October 20, 2015, 02:08
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Hi Tom,

thank you very much for your reply! It's nice to know, that I was on the right path
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