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

Role of Courant number in Density solver

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

Reply
 
LinkBack Thread Tools Display Modes
Old   January 20, 2013, 23:18
Angry Role of Courant number in Density solver
  #1
New Member
 
Dave Christopher
Join Date: Dec 2009
Posts: 23
Rep Power: 7
David Christopher is on a distinguished road
I am using the implicit density solver to analyze the blowdown of a high pressure tank into the atmosphere (supersonic flow). I do not understand the effect of the Courant number on the time step.
Fluent uses the Courant number to control the time step if the eigenvalues become too small. I tracked the time step using the statistics option and did not see any changes in the time step, but Co has a large effect of the result.
The strange result is that a larger Co gives more stable results that I think are better.
How can a larger Co help?
David Christopher is offline   Reply With Quote

Reply

Tags
courant, density solver

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
Strange residuals of the Density Based Solver Pat84 FLUENT 0 October 22, 2012 15:59
alphaEqn.H in twoPhaseEulerFoam cheng1988sjtu OpenFOAM Bugs 14 September 18, 2011 13:46
Very high courant number, time step continuity errors and bounding epsilon erncyc OpenFOAM Running, Solving & CFD 1 March 24, 2011 12:00
BlockMeshmergePatchPairs hjasak OpenFOAM Native Meshers: blockMesh 11 August 15, 2008 07:36
Fluent 6.4 courant number Aris Nikolopoulos FLUENT 0 May 6, 2008 08:52


All times are GMT -4. The time now is 02:34.