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

Modeling reduced flow rate in 2D

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 22, 2007, 09:27
Default Modeling reduced flow rate in 2D
  #1
Tom Smith
Guest
 
Posts: n/a
Hi,

I want to model the flow pattern in a simple U-shaped channel. The outlet of this u-shaped channel is narrowed compared to the inlet (about 30% of the inlet). In the real life process a part of the fluid (about 70%) in this channel is diffusing through a porous wall ("the third dimension"), resulting in a reduced flow rate (l/h) at the outlet of the channel. So to insure an equal flow velocity in the inlet and outlet of the channel (and throughout most of the channel), the reduction of the width of the outlet corresponds to the reduced flow rate.

Is it possible to take into account this reduction of flow rate in a 2D-model? And if so, how, and is it possible to gradually decrease the flow rate from cell to cell until the end of the channel?

Until now I have used a velocity BC on the inlet. However, since I have not been able to model the reduced flow rate at the outlet, I get an increased velocity at the outlet, due to the narrow channel.

I'm grateful for all tips you can give me!

Regards

Tom

  Reply With Quote

Old   April 27, 2007, 05:10
Default Re: Modeling reduced flow rate in 2D
  #2
JSM
Guest
 
Posts: n/a
hi,

Are you considering the porous medium effect in 2D simulation. I think if you consider the porous medium effect, then only you can get the reduced flow rate.

with regards, JSM
  Reply With Quote

Old   April 27, 2007, 10:04
Default Re: Modeling reduced flow rate in 2D
  #3
Tom Smith
Guest
 
Posts: n/a
Thank you for the response!

I'll look into your suggestion. As the newbie I am, I suddenly discovered the world of UDF, so right now I'm thinking about writing an UDF for a source term, which might solve the problem.
  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
Target Mass Flow Rate Nitin FLUENT 9 June 17, 2017 11:30
Mass flow rate sepidecent CFX 0 August 9, 2011 01:15
mass flow rate on the Iso-clip surface & interior Sunil Gupta FLUENT 0 April 22, 2008 10:29
target flow rate: varying results Ryan FLUENT 3 January 9, 2008 14:54
Inlet and outlet flow rate Neser CFX 1 March 2, 2004 17:02


All times are GMT -4. The time now is 08:40.