CFD Online Logo CFD Online URL
Home > Forums > Siemens

Courant number star-cd

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

LinkBack Thread Tools Display Modes
Old   January 15, 2008, 10:31
Default Courant number star-cd
Posts: n/a
Hi everyone,

I'd like to know if someone did already a 'Courant Number' investigation when using Prostar/es-ice. I am currently trying to fine-tune the time step so as to reduce my multi-cycle calculation time. The user-manual states that the 'local' Courant number has to stay below 100. Does anyone already try to overshoot this value? Is a value around 120-130 still ok?

  Reply With Quote

Old   January 15, 2008, 18:24
Default Re: Courant number star-cd
may be
Posts: n/a
  Reply With Quote

Old   January 16, 2008, 08:52
Default Re: Courant number star-cd
Posts: n/a
Often if you run 4 piso stages per temestep you will get the least CPU time per physical time. Therefore if you set your timestep to achieve this you will be doing about as well as you can (all other things being equal).

Obviously the physics of the problem has to allow this and the timestep has to be suitable to capture the necessary temporal details.

Grid generation is also key here as if you put small cells in high velocity zones and they were not needed then it significantly slows the overall progress of the simulation.
  Reply With Quote


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
Courant Number Aaron Latty CFX 16 November 12, 2012 19:27
what exactly is the Courant Number ??? CFX Novice CFX 1 July 26, 2006 13:40
Courant number msrinath80 OpenFOAM Running, Solving & CFD 1 May 29, 2006 17:20
Courant Number Ramana CFX 4 December 30, 2005 02:51
Courant Number Parshant Dhand FLUENT 1 April 29, 2003 20:39

All times are GMT -4. The time now is 12:51.