A wall has been placed at OUTLET

vortex69 · April 24, 2018, 19:08

Hi,

I am simulating a brush seal. I have extended my inlet and outlet. But I get this error message : A wall has been placed at portion(s) of an OUTLET

It is 30% of the face. One guy told me if you change it to opening, you will get more problems. So could anyone please explain me, what will be the problems by changing the outlet to opening ?

I thank you in advance

Gert-Jan · April 25, 2018, 04:08

Why don't you give it a try and see what you get?

When an outlet has a wall, this wall is artifical and will prevent fluid to enter through the outlet. When changing to an opening, no artificial wall will be placed, so the fluid will enter through your opening. Then you need to define what is entering (T, concentrations, etc) and in what direction (usually normal direction). The question is whether these boundary conditions are realisatic. It might be better to move your outlet further downstream........

BTW, it is a FAQ: https://www.cfd-online.com/Wiki/Ansy...f_an_OUTLET.22

April 24, 2018, 19:08	A wall has been placed at OUTLET	#1
vortex69 New Member Ali Join Date: Apr 2016 Location: Germany Posts: 26 Rep Power: 10	Hi, I am simulating a brush seal. I have extended my inlet and outlet. But I get this error message : A wall has been placed at portion(s) of an OUTLET It is 30% of the face. One guy told me if you change it to opening, you will get more problems. So could anyone please explain me, what will be the problems by changing the outlet to opening ? I thank you in advance

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Inlet and outlet boudary without wall between	Janshi	CFX	5	February 2, 2012 05:51
A wall has been placed at portion(s) of an OUTLET	aero123	CFX	1	November 9, 2011 19:14
UDF for wall slipping	HFLUENT	Fluent UDF and Scheme Programming	0	April 27, 2011 13:03
solution problem : A wall has been placed at portion(s) of an OUTLET	alnabhani	CFX	1	August 8, 2010 19:46
Combining BCs: wall - outlet. Boundary layer disappears	MartinaF	OpenFOAM Running, Solving & CFD	1	July 20, 2009 19:14

April 25, 2018, 04:08		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,928 Rep Power: 28	Why don't you give it a try and see what you get? When an outlet has a wall, this wall is artifical and will prevent fluid to enter through the outlet. When changing to an opening, no artificial wall will be placed, so the fluid will enter through your opening. Then you need to define what is entering (T, concentrations, etc) and in what direction (usually normal direction). The question is whether these boundary conditions are realisatic. It might be better to move your outlet further downstream........ BTW, it is a FAQ: https://www.cfd-online.com/Wiki/Ansy...f_an_OUTLET.22