Question about finding accurate pressure with CFD

NachtErfinder · May 26, 2016, 11:08

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, 17:05

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

May 26, 2016, 11:08	Question about finding accurate pressure with CFD	#1
NachtErfinder New Member Micah G Bullock Join Date: May 2016 Location: Houston Posts: 8 Rep Power: 10	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!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Wind tunnel Boundary Conditions in Fluent	metmet	FLUENT	6	October 30, 2019 13:23
Periodic flow using Cyclic - comparison with Fluent	nusivares	OpenFOAM Running, Solving & CFD	30	December 12, 2017 06:35
Question Concerning Pressure Value (Pressure outlet) and Reference Pressure (Physics)	andy_flow	STAR-CCM+	1	July 9, 2013 09:44
big question	happy	CFX	15	March 15, 2012 00:14
Hydrostatic pressure in 2-phase flow modeling (long)	DS & HB	Main CFD Forum	0	January 8, 2000 16:00

May 26, 2016, 17:05		#2
NachtErfinder New Member Micah G Bullock Join Date: May 2016 Location: Houston Posts: 8 Rep Power: 10	Never mind, I figured out my problem. I was misreading the program's results (between gauge pressure and atmospheric pressure).