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

L-shaped duct

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 6, 2010, 09:34
Default L-shaped duct
  #1
Senior Member
 
sega's Avatar
 
Sebastian Gatzka
Join Date: Mar 2009
Location: Frankfurt, Germany
Posts: 729
Rep Power: 12
sega is on a distinguished road
Hello world.

I'm trying to simulate the flow in an L-shaped duct.
See the picture attached.

I'm using velocity-inlet and outflow as boundary conditions.
The rest are walls.

Unfortunately the case does not converge.
Residuals are stuck at some level.

On what does the convergence of such a case depend?
Any ideas?
Attached Images
File Type: jpg lduct.jpg (71.9 KB, 10 views)
__________________
Schrödingers wife: "What did you do to the cat? It's half dead!"
sega is offline   Reply With Quote

Old   January 6, 2010, 10:42
Default
  #2
Senior Member
 
Philipov's Avatar
 
Svetlin Philipov
Join Date: Mar 2009
Location: United Kingdom
Posts: 176
Rep Power: 9
Philipov is on a distinguished road
First of all try to remesh the domain...as I see it is a bit of luck that you got constant residuals..... and.... I do not know the dimensions of the pipe, but..... outflow BC assumes fully developed flow... (for good results)
Philipov is offline   Reply With Quote

Old   January 6, 2010, 11:55
Default
  #3
Senior Member
 
sega's Avatar
 
Sebastian Gatzka
Join Date: Mar 2009
Location: Frankfurt, Germany
Posts: 729
Rep Power: 12
sega is on a distinguished road
Quote:
Originally Posted by Philipov View Post
First of all try to remesh the domain...as I see it is a bit of luck that you got constant residuals..... and.... I do not know the dimensions of the pipe, but..... outflow BC assumes fully developed flow... (for good results)
Remesh? I guess I should create a finer mesh?
Dimensions are 1m x 1m cross-section, with 10 meters overall-length.
__________________
Schrödingers wife: "What did you do to the cat? It's half dead!"
sega is offline   Reply With Quote

Old   January 6, 2010, 13:46
Default
  #4
Senior Member
 
Philipov's Avatar
 
Svetlin Philipov
Join Date: Mar 2009
Location: United Kingdom
Posts: 176
Rep Power: 9
Philipov is on a distinguished road
yes, refine the mesh, take into account the inlet BC (velocity, Re, adequately calculate the equivalent diameter, fluid type and so on)...
Philipov is offline   Reply With Quote

Reply

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
S shaped duct francois Main CFD Forum 5 May 16, 2014 05:44
Fabric Duct Modeling Dan FLUENT 0 June 30, 2008 15:00
Total pressure increase in the diverging duct shiv CD-adapco 3 February 1, 2008 04:39
modelling fuel cell duct in fluent rajesh kumar tippabhotla FLUENT 2 October 7, 2004 12:04
flow simulation across a small fan jane luo Main CFD Forum 15 April 12, 2004 17:49


All times are GMT -4. The time now is 03:22.