CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Courant no. unstable

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

LinkBack Thread Tools Search this Thread Display Modes
Old   December 10, 2022, 06:03
Exclamation Courant no. unstable
New Member
Rishi Kumar
Join Date: Jun 2022
Posts: 20
Rep Power: 4
rishik686 is on a distinguished road
Hi everyone,
I am trying to run a fluid flow simulation in an artery using pimple Foam.
But the courant number is increasing abruptly.

Earlier when i tried the same for simple tube it run perfectly with stable Courant No.

Please help me to stablize the courant no. so that my simulation can converge.
Rishi K.
rishik686 is offline   Reply With Quote

Old   December 19, 2022, 11:01
Senior Member
Josh Williams
Join Date: Feb 2021
Location: Scotland
Posts: 113
Rep Power: 5
joshwilliams is on a distinguished road
I guess the artery has some curvature near the outlets which causes backflow issues. You may wish to change your BCs to a robust one that cancels backflow (I think totalPressure and inletOutlet do this).

Difficult to help without info such as your BCs, y+, any turbulence model etc..
joshwilliams is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
courant number increases to rather large values 6863523 OpenFOAM Running, Solving & CFD 22 July 5, 2023 23:48
pimpleFoam, rhoPimpleFoam unstable at small Courant numbers (time-steps) peob OpenFOAM Running, Solving & CFD 18 November 13, 2020 13:56
same geometry,structured and unstructured mesh,different behaviour. sharonyue OpenFOAM Running, Solving & CFD 13 January 2, 2013 22:40
Upgraded from Karmic Koala 9.10 to Lucid Lynx10.04.3 bookie56 OpenFOAM Installation 8 August 13, 2011 04:03
Could anybody help me see this error and give help liugx212 OpenFOAM Running, Solving & CFD 3 January 4, 2006 18:07

All times are GMT -4. The time now is 19:24.