CFD Online Logo CFD Online URL
Home > Forums > FLUENT

courant number

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

LinkBack Thread Tools Display Modes
Old   February 3, 2012, 06:54
Default courant number
Senior Member
Join Date: Nov 2010
Posts: 185
Rep Power: 7
hamid1 is on a distinguished road
how will it be interpreted if the simulation pass the criteria of courant number 0.25,
how wrong will the result of the simulation will be if the courant number is abit higher than 0.25, or if it is 1, 1.5, 2 or very high,
I am asking this because i dont have very much sense of it,
i know the definition but i dont know how much it effects the results of the simulation
Thank u so much
hamid1 is offline   Reply With Quote

Old   February 3, 2012, 23:50
Senior Member
shoeb khan
Join Date: Nov 2011
Posts: 179
Rep Power: 6
shk12345 is on a distinguished road
just decrease the time step and see
decrease by 1/10 .
it will improve the results
shk12345 is offline   Reply With Quote

Old   February 4, 2012, 01:41
Super Moderator
Join Date: Mar 2009
Location: Islamabad
Posts: 4,299
Blog Entries: 6
Rep Power: 43
Far will become famous soon enoughFar will become famous soon enough
Send a message via Skype™ to Far
If you dont get the required convergence then results may be inaccurate, otherwise using higher courant is recommended. This is general guideline, for your particular problem you must do the sensitivity analysis that how much convergence level is required and what is the effect of different courant no. on this convergence accuracy.
Far is offline   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 fireman FLUENT 5 July 28, 2016 12:55
IcoFoam unstability, courant number gets large! vivien OpenFOAM 10 July 23, 2013 12:48
LES near wall model & courant number kasim CFX 5 March 16, 2008 19:23
IcoFoam parallel woes msrinath80 OpenFOAM Running, Solving & CFD 9 July 22, 2007 02:58
Courant number calculation - unsteady flow Kuba FLUENT 0 November 8, 2005 23:44

All times are GMT -4. The time now is 15:06.