pressure definition in OpenFOAM

vaina74 · November 18, 2014, 10:04

Hi everybody, sorry for the trivial question.
I have a doubt about pressure definition in OpenFoam. I've already looked for that in the forum, but I've sometimes found different answers and samples.
If I'm right, pressure is divided by fluid density (m2/s2). Could you confirm this, please? Anyway, for incompressible solvers a relative pressure (related to a reference value) can be adopted.

chegdan · November 18, 2014, 15:16

yes, you are correct. For the incompressible solvers (e.g. simpleFoam) pressure is actually pressure/density.

vaina74 · November 20, 2014, 08:28

Thanks for your confirmation, Daniel. So I could define a new field for 'conventional' pressure in ParaView (filter calculator) or post-process with Function Objects. I need to investigate this, I've just had a quick look and - am I correct? - simpleFunctionObjects are not valid in OpenFoam-2.3. I'll check if swak4Foam libraries are what I'm looking for.

chegdan · November 20, 2014, 09:02

Using the ParaView calculator is easy enough, but yes you could make a function object to make pressure or even a post-processing utility to convert to the actual pressure.

November 18, 2014, 10:04	pressure definition in OpenFOAM	#1
vaina74 Senior Member Join Date: Feb 2010 Posts: 213 Rep Power: 17	Hi everybody, sorry for the trivial question. I have a doubt about pressure definition in OpenFoam. I've already looked for that in the forum, but I've sometimes found different answers and samples. If I'm right, pressure is divided by fluid density (m2/s2). Could you confirm this, please? Anyway, for incompressible solvers a relative pressure (related to a reference value) can be adopted.

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November 18, 2014, 15:16		#2
chegdan Senior Member Daniel P. Combest Join Date: Mar 2009 Location: St. Louis, USA Posts: 621 Rep Power: 0	yes, you are correct. For the incompressible solvers (e.g. simpleFoam) pressure is actually pressure/density.

November 20, 2014, 08:28		#3
vaina74 Senior Member Join Date: Feb 2010 Posts: 213 Rep Power: 17	Thanks for your confirmation, Daniel. So I could define a new field for 'conventional' pressure in ParaView (filter calculator) or post-process with Function Objects. I need to investigate this, I've just had a quick look and - am I correct? - simpleFunctionObjects are not valid in OpenFoam-2.3. I'll check if swak4Foam libraries are what I'm looking for.

November 20, 2014, 09:02		#4
chegdan Senior Member Daniel P. Combest Join Date: Mar 2009 Location: St. Louis, USA Posts: 621 Rep Power: 0	Using the ParaView calculator is easy enough, but yes you could make a function object to make pressure or even a post-processing utility to convert to the actual pressure.