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

How Does Fluent Handle Volume Flow in 2D and 3D

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 15, 2008, 17:20
Default How Does Fluent Handle Volume Flow in 2D and 3D
  #1
Shawn
Guest
 
Posts: n/a
I am running a model in both 2D and 3D with the same X & Y dimensions. After iterations based on a constant pressure or velocity inlet boundary conditions, I observed that the resulting velocity vector plots are similar but the volumetric flow rates at the inlets and outlets are dramatically different. This totally makes sense. But I'm curious as to how exactly FLUENT treats the 2D model. I can't seem to find that information anywhere. Also, can I obtain any scaling factor to convert the 2D flow data into 3D flow data (for faster simulations)? Thanks!
  Reply With Quote

Old   July 15, 2008, 18:37
Default Re: How Does Fluent Handle Volume Flow in 2D and 3
  #2
umesh javiya
Guest
 
Posts: n/a
2D geometry is slice for the 3D geometry....

means physically it is assumed that the width is infinite long.....

like rectangle channel in 3D can be represented by 2D plane rectangle geometry provided that the width of 3D channel is large enough to consider as not affecting the flow....

  Reply With Quote

Old   July 16, 2008, 00:18
Default Re: How Does Fluent Handle Volume Flow in 2D and 3
  #3
CDE
Guest
 
Posts: n/a
2D is not infinitly wide. If it was you would have an infinite inlet area and infinite flow rate.

By default, it is unit depth (1 metre) but you can change it in the reference values as far as I can remember. So, to calculate you inlet area it is simply the height*1m depth.

If your problem is cyclindrical shape you should use the 2D axisymmetric model.
  Reply With Quote

Old   July 16, 2008, 03:06
Default Re: How Does Fluent Handle Volume Flow in 2D and 3
  #4
umesh javiya
Guest
 
Posts: n/a
sorry..... you are right it is a unit length....
  Reply With Quote

Old   July 16, 2008, 15:38
Default Re: How Does Fluent Handle Volume Flow in 2D and 3
  #5
Friend
Guest
 
Posts: n/a
In cylindrical shape isn't the unit depth defined as one radian?
  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
volume fraction in multiphasic flow in fluent max FLUENT 0 February 16, 2009 09:08
How to handle it ivanyao OpenFOAM Pre-Processing 6 August 24, 2008 22:27
impossible for fluent 6 to handle wall functions!? mike FLUENT 0 November 15, 2006 20:18
How to handle peoridic boundary in multiphase flow Harry Main CFD Forum 0 November 19, 2005 16:10
Can Fluent handle species transport in multi-phase Roger FLUENT 1 January 30, 2003 20:12


All times are GMT -4. The time now is 21:28.