Question about finding accurate pressure with CFD

NachtErfinder · May 26, 2016, 10:08

Hello All,

I am very new to this forum, and to CFD. Let me know if I'm not obeying proper forum etiquette, and thanks for having me!

I have a question about finding accurate pressures in a CFD simulation I am running. I have picked various points within the model to examine the static pressure and velocity at.

I have 2 inlets and 1 outlet.

Inlet 1 B.C.: Volumetric Flow rate, temp
Inlet 2 B.C.: Volumetric Flow rate, temp
Outlet B.C.: Atmospheric pressure

The problem is the points are returning with a negative gauge pressure, when I think they should have a positive gauge pressure. Should I apply an atmospheric gauge pressure to the inlets, in order to get an accurate pressure reading? Is there a better way to do this?

I might be going about this the wrong way, as I said I am very new to CFD.

Thanks in advance for your help!

NachtErfinder · May 26, 2016, 16:05

Never mind, I figured out my problem. I was misreading the program's results (between gauge pressure and atmospheric pressure).

May 26, 2016, 10:08	Question about finding accurate pressure with CFD	#1
NachtErfinder New Member Micah G Bullock Join Date: May 2016 Location: Houston Posts: 8 Rep Power: 9	Hello All, I am very new to this forum, and to CFD. Let me know if I'm not obeying proper forum etiquette, and thanks for having me! I have a question about finding accurate pressures in a CFD simulation I am running. I have picked various points within the model to examine the static pressure and velocity at. I have 2 inlets and 1 outlet. Inlet 1 B.C.: Volumetric Flow rate, temp Inlet 2 B.C.: Volumetric Flow rate, temp Outlet B.C.: Atmospheric pressure The problem is the points are returning with a negative gauge pressure, when I think they should have a positive gauge pressure. Should I apply an atmospheric gauge pressure to the inlets, in order to get an accurate pressure reading? Is there a better way to do this? I might be going about this the wrong way, as I said I am very new to CFD. Thanks in advance for your help!

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May 26, 2016, 16:05		#2
NachtErfinder New Member Micah G Bullock Join Date: May 2016 Location: Houston Posts: 8 Rep Power: 9	Never mind, I figured out my problem. I was misreading the program's results (between gauge pressure and atmospheric pressure).