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How to get the output pressure of OpenFoam?

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Old   November 25, 2016, 05:56
Default How to get the output pressure of OpenFoam?
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IGH
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Isar Ghamari
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Hi,

I am new to OpenFoam, so sorry if this is a basic question.
I am using OpenFoam for solving the forces and moments on a 2D rectangulat tank with motion. but first I am doing some simulation on a static tank at rest (without any motions) so that we know all the pressure at tank bottom theoretically and we can check to see if we are using the OpenFoam at right setup.
when I use the pressure probes at bottom of the tank, I get some values that I don't understand them at all. what do we get (at which dimension) as output when we want P out of the probes?
I get some values like +11 as p-rgh and values like -0.4 as P.
the tank depth is 4cm and tanktop is open atmosphere.

Thanks
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Old   October 4, 2017, 10:36
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saeed barzegar
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Hi Isar, How are you?

I had same problem recently and I think you got those values because your probes' locations were out of your computational domain.
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Old   October 4, 2017, 10:56
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Isar Ghamari
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Hi Saeed. Thanks.
No that was not my problem. Normally it gives the pressures relative to a basic pressure at a predefined point. So one should define that point in air domain normally to get some meaningful pressure values at other probes, otherwise it seems nonsense.
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Old   October 4, 2017, 11:38
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Yes, you are right. That is reference pressure and it must be assigned to a specific cell. And it is suggested to define this cell in the air phase for two-phase flow problems.
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