Pressure inlet problem

Laci · October 4, 2010, 05:26

Hi guys,

I face with a problem when I use pressure inlet boundary conditions.
I simulate a reactor with compressible reacting flow. The calculation converge quite fast and the residuals are really low.

The only problem, that the pressure on the pressure inlet boundary, where I set the gauge pressure, is not the same I set at the beginning.

It seems Fluent calculates due to: p=pg+1/2*rho*g
Could you help me out, how to set really homogenous pressure on this boundary?
Thank you very much in advance.
Bests.

JoFFe · October 4, 2010, 18:27

I'm a fluent newbie but you maybe have 1 atm as operating pressure? The pressure shown at the inlet on a vector plot is the operting pressure + gaguge pressure at inlet. I think so atleast.

Laci · October 5, 2010, 05:51

I have figured out what was the problem. I just made a silly error. Thx

October 4, 2010, 05:26	Pressure inlet problem	#1
Laci Member anonym Join Date: Mar 2009 Posts: 65 Rep Power: 17	Hi guys, I face with a problem when I use pressure inlet boundary conditions. I simulate a reactor with compressible reacting flow. The calculation converge quite fast and the residuals are really low. The only problem, that the pressure on the pressure inlet boundary, where I set the gauge pressure, is not the same I set at the beginning. It seems Fluent calculates due to: p=pg+1/2rhog Could you help me out, how to set really homogenous pressure on this boundary? Thank you very much in advance. Bests.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Pressure Inlet Boundary Condition	Prasad	FLUENT	6	April 9, 2013 22:32
pressure with velocity inlet boundary conditions	Ashraf Sharara	FLUENT	1	August 21, 2008 08:29
Pressure Inlet yields wrong velocities	Ben	FLUENT	0	November 21, 2004 02:47
Gas pressure question	Dan Moskal	Main CFD Forum	0	October 24, 2002 23:02
what the result is negatif pressure at inlet	chong chee nan	FLUENT	0	December 29, 2001 06:13

October 4, 2010, 18:27		#2
JoFFe New Member JoFFe JoFF Join Date: Oct 2010 Posts: 7 Rep Power: 16	I'm a fluent newbie but you maybe have 1 atm as operating pressure? The pressure shown at the inlet on a vector plot is the operting pressure + gaguge pressure at inlet. I think so atleast.

October 5, 2010, 05:51		#3
Laci Member anonym Join Date: Mar 2009 Posts: 65 Rep Power: 17	I have figured out what was the problem. I just made a silly error. Thx