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

2 domains - 2 physical timesteps? How to?

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

Reply
 
LinkBack Thread Tools Display Modes
Old   March 30, 2009, 12:36
Default 2 domains - 2 physical timesteps? How to?
  #1
New Member
 
Craig Hildreth
Join Date: Mar 2009
Posts: 22
Rep Power: 8
flattie is on a distinguished road
I have 2 fluid domains with a solid between them. How can I set two different physical timesteps, without resorting to autotimestepping, which I don't want to use? The size of my domains is vastly different and the timescale needed to get the small domain to converge leads to very slow convergence on the large domain.

Thanks!

Craig Hildreth
flattie is offline   Reply With Quote

Old   March 30, 2009, 20:42
Default
  #2
Senior Member
 
Rikio
Join Date: Mar 2009
Location: SH, China
Posts: 182
Blog Entries: 1
Rep Power: 8
rikio is on a distinguished road
Send a message via Skype™ to rikio
Local Timescale Factor can be used to set different timescales for different domains automatically. Please refer to section of "Steady State Time Scale Control" in HELP.
Wish it helps.
rikio is offline   Reply With Quote

Old   March 31, 2009, 11:31
Default
  #3
New Member
 
Craig Hildreth
Join Date: Mar 2009
Posts: 22
Rep Power: 8
flattie is on a distinguished road
Thanks, but doesn't Localtimescale factor have a different timestep on an element basis rather than a domain one? I want to set the timestep for the domain as a whole.
flattie is offline   Reply With Quote

Old   April 4, 2009, 20:44
Default
  #4
Senior Member
 
Join Date: Apr 2009
Posts: 511
Rep Power: 12
stumpy is on a distinguished road
You can do this, but it's CCL only. Essentially copy the entire SOLVER CONTROL section and paste it under the DOMAIN section. Delete all the parameter except the timescale control parameters.
Mike
stumpy is offline   Reply With Quote

Old   April 5, 2009, 04:01
Default
  #5
Senior Member
 
Rikio
Join Date: Mar 2009
Location: SH, China
Posts: 182
Blog Entries: 1
Rep Power: 8
rikio is on a distinguished road
Send a message via Skype™ to rikio
Stumpy,

Does it work? I will have a try on this to check this "new" feature...hehe
rikio is offline   Reply With Quote

Old   April 5, 2009, 19:27
Default
  #6
Senior Member
 
Join Date: Apr 2009
Posts: 511
Rep Power: 12
stumpy is on a distinguished road
Yeh, it works, I've used it before. You can do phase-specific timescales too in a similar way by pasting into the FLUID object of a domain. If you know how to read the RULES file (<install dir>/etc/RULES) you can see that SOLVER CONTROL is a valid child of a DOMAIN object.
stumpy 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
Superlinear speedup in OpenFOAM 13 msrinath80 OpenFOAM Running, Solving & CFD 18 March 3, 2015 06:36
Version 20 of the bmshb file format to FOAM converter 7islands Open Source Meshers: Gmsh, Netgen, CGNS, ... 35 April 1, 2010 05:13
Multiple Solid Domains - Interfaces Scott CFX 8 July 31, 2008 15:20
multi fluid domains with differ. physical charact. John Walker CFX 5 April 15, 2006 22:32
Different physical mesh domains Juergen Almanstoetter (Almanstoetter) OpenFOAM Running, Solving & CFD 1 January 24, 2005 12:32


All times are GMT -4. The time now is 02:40.