CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > ANSYS > FLUENT

Boundary condition of species transport for Pressure outlet Boundary condition

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree1Likes
  • 1 Post By hnemati

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   September 23, 2020, 04:33
Default Boundary condition of species transport for Pressure outlet Boundary condition
  #1
New Member
 
THA SEANGHAI
Join Date: Aug 2020
Location: Cambodia
Posts: 25
Rep Power: 2
THA SEANGHAI is on a distinguished road
Hello! Everyone! I have a question in Fluent, as you can see the following figure, for the Pressure outlet, if we set the species mass fraction=0, it means that we set the mass fraction equal zero in the case of back flow, but if there is no backflow velocity, so the mass fraction is non-zero, and all the species will come from the interior and can pass through the outlet to the outside, am I right? Thank you!
The following link is my figure:
https://previews.dropbox.com/p/thumb...ue&size_mode=5
THA SEANGHAI is offline   Reply With Quote

Old   September 25, 2020, 15:00
Red face
  #2
New Member
 
Agata Kicun
Join Date: Mar 2018
Posts: 1
Rep Power: 0
AgataK is on a distinguished road
I am struggling to understand this BC too... could anyone shed some light on the matter?

EDIT. I found it. Check out this thread:
Boundary Conditions

Last edited by AgataK; September 26, 2020 at 07:20.
AgataK is offline   Reply With Quote

Old   September 28, 2020, 20:45
Default
  #3
New Member
 
THA SEANGHAI
Join Date: Aug 2020
Location: Cambodia
Posts: 25
Rep Power: 2
THA SEANGHAI is on a distinguished road
Quote:
Originally Posted by AgataK View Post
I am struggling to understand this BC too... could anyone shed some light on the matter?

EDIT. I found it. Check out this thread:
Boundary Conditions
Finally, what I said above is correct. When I set mass fraction at the outlet equal zero, it means that mass fraction will be zero in the case of there is backflow in to the domain (there is reversed flow into the domain at the outlet). I already tried this case and I got the results like what I think.
THA SEANGHAI is offline   Reply With Quote

Old   October 5, 2020, 03:42
Default
  #4
Member
 
SAM
Join Date: Apr 2012
Posts: 72
Rep Power: 11
hnemati is on a distinguished road
That is correct. In cases, you don't have any backflow, you can set it any values.
THA SEANGHAI likes this.
hnemati is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
The method on dealing with velocity in static pressure outlet boundary condition mona.li CFX 2 September 30, 2017 01:33
Problem in setting Boundary Condition Madhatter92 CFX 12 January 12, 2016 04:39
Boundary Condition for reacting species flow at outlet Astrodan OpenFOAM Running, Solving & CFD 0 September 25, 2014 10:59
An error has occurred in cfx5solve: volo87 CFX 5 June 14, 2013 17:44
How to set the Heat Flux boundary condition at Outlet creddy_trddc CFX 3 September 21, 2011 07:44


All times are GMT -4. The time now is 06:05.