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

Achieving convergence in model with porouse medium

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

Reply
 
LinkBack Thread Tools Display Modes
Old   August 19, 2003, 06:12
Default Achieving convergence in model with porouse medium
  #1
mneo
Guest
 
Posts: n/a
I have troubles with achieving convergence during computations what can I do? regards
  Reply With Quote

Old   August 19, 2003, 06:56
Default Re: Achieving convergence in model with porouse me
  #2
ap
Guest
 
Posts: n/a
You can do many things to improve convergence. These are some general guidelines:

1) Use a good quality mesh.

2) If you're using a high order discretization scheme, try starting with the first order scheme, then switch to the higher one.

3) Reduce under-relaxation factors.

4) Change solver parameters (sweeps,...).

What model are you using? What discretization scheme? And what residuals don't reduce?

Hi

ap
  Reply With Quote

Old   August 19, 2003, 07:14
Default Re: Achieving convergence in model with porouse me
  #3
mneo
Guest
 
Posts: n/a
I use: steady and k-e model first order scheme under-relaxation factors: preasure-0,2 momentum-0,5 k,e-0,6 mesh type-hexa
  Reply With Quote

Old   August 20, 2003, 04:44
Default Re: Achieving convergence in model with porouse me
  #4
jieremy
Guest
 
Posts: n/a
And you can also conpute innitially using a simple Model.When u have got a initial value then u can change your model.I always do it and it works well.
  Reply With Quote

Old   August 20, 2003, 05:19
Default Re: Achieving convergence in model with porouse me
  #5
mneo
Guest
 
Posts: n/a
My problem is flow through perforated plate with 45% open.I start computations without turning on "porous zone" and "laminar zone" in Fluid panel in boundary conditions and I achieved convergence. With turned on "laminar zone" I achieved convergence too but I dont't know it's right. Any suggestions? regards
  Reply With Quote

Old   August 20, 2003, 07:36
Default Re: Achieving convergence in model with porouse me
  #6
ap
Guest
 
Posts: n/a
If the problem is the reduction of k-eps residuals, try to reduce their under-relaxation factors to 0.4.
  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
Convergence Centurion2011 FLUENT 19 February 3, 2014 12:07
Heat Transfer convergence Problem mit a 1/6 compressor model chili023 CFX 1 January 15, 2011 06:41
Convergence of CFX field in FSI analysis nasdak CFX 2 June 29, 2009 01:17
no convergence due to simplified model Jason FLUENT 0 September 9, 2008 23:03
Convergence of the porous medium model fpingqian FLUENT 0 January 8, 2008 22:54


All times are GMT -4. The time now is 01:55.