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

Backflow

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 19, 2018, 06:34
Default Backflow
  #1
Senior Member
 
Onur Özcan
Join Date: Feb 2016
Location: Istanbul/Turkey
Posts: 461
Rep Power: 9
oozcan is on a distinguished road
Hello guys,

I am working on cooling performance of some heat exchangers using in the buses. Model is consist of radiator,intercooler,oil cooler and fan. To review their performance has been prepared a wind tunnel. Air enters to the domain and run across a grill and then go through intercooler,oil cooler,radiator and fan,respecitvely.

Outlet side in the model has been extended more than inlet side. But pressure gradient at the outlet is more than at inlet. That is why, both pressure outlet and pressure inlet has backflow.

I have still not activated porous cell zones.if flow is desired and has a regime, then they wil be activated as porous cell zone.

Is there a way nor any way to eliminate backflow in that case?

Could it be ok if I decrease gauge pressure at the outlet (below zero gauge pressure) ?

Best Regards,

Last edited by oozcan; October 22, 2018 at 03:53.
oozcan is offline   Reply With Quote

Old   October 22, 2018, 03:54
Default
  #2
Senior Member
 
Onur Özcan
Join Date: Feb 2016
Location: Istanbul/Turkey
Posts: 461
Rep Power: 9
oozcan is on a distinguished road
Anyone?

It will be appreciated!
oozcan is offline   Reply With Quote

Old   December 7, 2018, 13:11
Default
  #3
New Member
 
Join Date: Aug 2017
Posts: 3
Rep Power: 5
Teddo is on a distinguished road
You can extend your outlet length to eliminate backflow.
Teddo 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
Inducing backflow restrictions in domain interface for multiphase flow DarrenC CFX 4 August 6, 2014 21:17
Modeling Backflow for a 3D Airfoil (Wing of Finite Span) Josh CFX 9 August 18, 2009 11:31
how to prevent backflow? May Lim FLUENT 2 June 20, 2007 12:17
Problem with integrals and averages if backflow?? Amit FLUENT 0 October 19, 2006 18:54
Swirl in backflow on pressure outlets Jonas Larsson FLUENT 17 February 3, 2000 02:14


All times are GMT -4. The time now is 03:48.