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

Time step size with adaptive time steps

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

Reply
 
LinkBack Thread Tools Display Modes
Old   April 12, 2013, 13:56
Default Time step size with adaptive time steps
  #1
New Member
 
Join Date: Dec 2010
Posts: 3
Rep Power: 6
Racing_34 is on a distinguished road
Hi everyone,
i'm trying to run a transient simulation with adaptive time step length.
I have an expression in which i need the time step size, but i can't figure out how i can get that information. I tried both with dtstep and with "Time Step Size" but, even if in cfx-pre they're written in italic (which means i'm calling a built-in expression), in cfx-post i have this message "ERROR
The following unrecognized name was referenced: Time Step Size." and cfx can't calculate my expression.

So, how can i get the information i need?

Thank you
Racing_34 is offline   Reply With Quote

Old   April 13, 2013, 07:57
Default
  #2
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,923
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
dtstep is available in the solver but not the post-processor. It should work fine in the solver. So I presume you are using it in the post processor. Why do you need it in the post processor?
ghorrocks is offline   Reply With Quote

Old   April 14, 2013, 10:15
Default
  #3
New Member
 
Join Date: Dec 2010
Posts: 3
Rep Power: 6
Racing_34 is on a distinguished road
Quote:
Originally Posted by ghorrocks View Post
dtstep is available in the solver but not the post-processor. It should work fine in the solver. So I presume you are using it in the post processor. Why do you need it in the post processor?
i'm modeling the saturation of a dual scale porous media, saturation is defined as 'accumulated saturation'+constant*t step size so i need to visualize it because it's one of my work's output

thanks
Racing_34 is offline   Reply With Quote

Old   April 14, 2013, 18:32
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 10,923
Rep Power: 85
ghorrocks has a spectacular aura aboutghorrocks has a spectacular aura aboutghorrocks has a spectacular aura about
I cannot see a way of doing this in the post processor. You can do this in the solver by defining an additional variable and a source term. Alternately you can export the raw data and do the intgeration in another package (excel, matlab, python whatever you like).
ghorrocks 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
Time step size, number of time steps and max iterations per time step guido_88 FLUENT 4 August 30, 2012 14:49
Multiple floating objects CKH OpenFOAM 10 September 21, 2011 23:13
OF 1.6 | Ubuntu 9.10 (64bit) | GLIBCXX_3.4.11 not found piprus OpenFOAM Installation 22 February 25, 2010 14:43
Problems in compiling paraview in Suse 10.3 platform chiven OpenFOAM Installation 3 December 1, 2009 08:21
Is there a way to write the time step size, time a may FLUENT 6 November 22, 2009 12:52


All times are GMT -4. The time now is 20:59.