CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > SU2

Adaptive CFL parameters

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 22, 2022, 10:14
Default Adaptive CFL parameters
  #1
New Member
 
Shahid Khan
Join Date: Jan 2022
Posts: 8
Rep Power: 4
shahidhk21 is on a distinguished road
I need to some help in deciding adaptive CFL parameters for my case
It is a 3-d, supersonic, viscous, steady, turbulent flow case with flow in x direction, RANS simulation. I have given value of CFL=0.5, Euler Implicit scheme, FGMRES linear solver with ILU preconditioner.

My solution initially converges for some iterations then starts to diverge.

I have given parameter CFL_ADAPT=(0 , 1.2, 0.5, 100 ) respectively based on given template and tutorial cases. I am not sure about these parameters.

Can anyone give me some more idea about adaptive CFL and how I can modify these parameters for convergence of my results?

Also, can we print CFL value for each iteration in our console as screen output just like residual?

I am new to SU2 and CFD.
shahidhk21 is offline   Reply With Quote

Old   January 23, 2022, 06:05
Default
  #2
Member
 
PENG YAN
Join Date: Jul 2021
Location: Italy
Posts: 34
Rep Power: 4
PENGGEGE777 is on a distinguished road
Hi, you can find more info about CFL adaptive in su2 homepage or config_template.

Usually, I set parameter = (0.1, 1.1, 1, 100)-----------CFL factor up, down, min, max.

Also, from your descripttion, maybe divergence of your simulation is not due to CFL number. You can check your mesh, bounadry contidions, numerical schemes, etc.
PENGGEGE777 is offline   Reply With Quote

Old   January 23, 2022, 07:36
Default
  #3
Member
 
Shahid Khan
Join Date: Jan 2020
Posts: 35
Rep Power: 6
shahidkhan is on a distinguished road
Sure, I will try with that. I also think that there is some issue with my grid but i wanted to try other things first before going to the grid part. I will try with this. If not I will look into other things
shahidkhan is offline   Reply With Quote

Reply

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
Solver parameters to solve convergence issue WilliamH SU2 5 February 5, 2021 06:19
Unsteady Restart Divergence pro_ SU2 6 May 20, 2020 15:17
Pro/E to ANSYS Parameterization Guide Trues ANSYS 4 April 18, 2018 05:52
CFL Adapt parameter DLuo SU2 3 April 13, 2018 05:07
Test Case CFL Number Issues with Software Update JBCFD SU2 3 July 14, 2017 12:05


All times are GMT -4. The time now is 14:19.