# General understanding of postprocessing in paraFoam

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 October 15, 2015, 05:38 General understanding of postprocessing in paraFoam #1 Member   Join Date: Jul 2015 Location: Aalborg Posts: 83 Rep Power: 3 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!

October 16, 2015, 05:10
#2
Senior Member

Tom Fahner
Join Date: Mar 2009
Location: Delft, Netherlands
Posts: 318
Rep Power: 12
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

 October 20, 2015, 02:08 #3 Member   Join Date: Jul 2015 Location: Aalborg Posts: 83 Rep Power: 3 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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