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

Turning off equations during solution in CFX, like fluent.

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   April 26, 2015, 09:25
Default Turning off equations during solution in CFX, like fluent.
  #1
Member
 
Adil Syyed
Join Date: May 2012
Posts: 49
Rep Power: 14
adilsyyed is on a distinguished road
In fluent, we can turn off an equation (say energy equation) at the start of the solution. After some iterations, we stop the solver and turn on the energy equation again.
This technique is very useful when initially the solution tends to diverge.
Is it possible to do this in ANSYS CFX?
adilsyyed is offline   Reply With Quote

Old   April 26, 2015, 18:03
Default
  #2
New Member
 
Kushal J
Join Date: Apr 2015
Location: chicago
Posts: 5
Rep Power: 11
KushalJ is on a distinguished road
I think this should be doable through expert parameters in CFX. search for the expert parameters in ANSYS documentation or look in CFX-pre, Insert -> Solver -> Expert Parameter.
KushalJ is offline   Reply With Quote

Old   April 26, 2015, 18:38
Default
  #3
Member
 
Adil Syyed
Join Date: May 2012
Posts: 49
Rep Power: 14
adilsyyed is on a distinguished road
Quote:
Originally Posted by KushalJ View Post
I think this should be doable through expert parameters in CFX. search for the expert parameters in ANSYS documentation or look in CFX-pre, Insert -> Solver -> Expert Parameter.
Seems like it should be there. I will thoroughly consult documentation and CFX-Pre for expert parameters. If there is any problem, I will come back here and post it.

Thank you Sir.
adilsyyed is offline   Reply With Quote

Old   April 27, 2015, 04:57
Default
  #4
Senior Member
 
Thomas MADELEINE
Join Date: Oct 2014
Posts: 126
Rep Power: 12
Thomas MADELEINE is on a distinguished road
to select which equation you want to activate or deactivate :
go to expert parameter -> last tab "model override" -> and then select the equation you want to modify (by default it is on solving of course)

for the stability I would rather use an under relaxation parameter (in the expert parameter too) or play with the order of the calculation like something with the first order and no turbulence as initialization for example.
Thomas MADELEINE is offline   Reply With Quote

Reply


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
The fluent stopped and errors with "Emergency: received SIGHUP signal" yuyuxuan FLUENT 0 December 3, 2013 23:56
Fluent exceeding Solution Limits on faces bawfuls FLUENT 3 July 10, 2012 17:34
High Resolution (CFX) vs 2nd Order Upwind (Fluent) gravis ANSYS 3 March 24, 2011 03:43
Wall function formulation in CFX and Fluent gravis ANSYS 0 May 4, 2010 12:03
Reynolds Stress model in CFX vs Fluent Tim CFX 1 October 7, 2009 07:19


All times are GMT -4. The time now is 17:27.