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

Fluent, scale domain help!

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 15, 2011, 22:22
Unhappy Fluent, scale domain help!
  #1
New Member
 
Bill
Join Date: Apr 2011
Posts: 2
Rep Power: 0
sunbiao8411 is on a distinguished road
Hello everyone!

For a 3D computational domain like 1000m x 1000m x 50m, to simulate its velocity and temperature field, after setting boundary conditions and calculation, the scaled residuals are not convergent, just after several iteration steps, the lines are flat at the level of 1e-01. However, when scaling like 100m x 100m x 5m, and the same boundary conditions, the results are convergent very well.

Somebody can tell me why, and how to set for the larger domain like 1000m x 1000m x 50m to make the calculation convergent well. Really frustrating for the problem.

Really appreciating for your help.

Bill
sunbiao8411 is offline   Reply With Quote

Old   May 18, 2011, 17:05
Default
  #2
New Member
 
mojtaba
Join Date: Nov 2010
Posts: 25
Rep Power: 6
mojtaba1365 is on a distinguished road
you can decrease the under relaxations ....
mojtaba1365 is offline   Reply With Quote

Old   May 18, 2011, 21:02
Default
  #3
New Member
 
Bill
Join Date: Apr 2011
Posts: 2
Rep Power: 0
sunbiao8411 is on a distinguished road
Quote:
Originally Posted by mojtaba1365 View Post
you can decrease the under relaxations ....
Thanks guy.
I have found the problem. Just because I set one side of the square as air velocity inlet, and the others as pressure outlets. If there is only one pressure outlet opposite to inlet, with other two sides as walls, then the calculation is perfect. However, in fact, all of the other three sides should be pressure outlets, I will try further to solve the problem properly.
Thanks for your attention.
sunbiao8411 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
Domain format problem on airfoil flow simulation andrenonaka CFX 6 December 4, 2014 04:57
Material identification between a flow domain and a porous domain Ervideiro CFX 1 June 1, 2010 09:50
How can I extend the domain in Fluent? gabrielg FLUENT 1 November 12, 2008 01:44
Fidap to Fluent Ravi FLUENT 3 July 10, 2008 13:31
CFX Solver Memory Error mike CFX 1 March 19, 2008 08:22


All times are GMT -4. The time now is 07:18.