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

Divergence Problem SU2

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 18, 2018, 18:20
Default Divergence Problem SU2
  #1
New Member
 
Ahmed
Join Date: Nov 2017
Posts: 15
Rep Power: 8
Moharam is on a distinguished road
Hello Everyone
I'm using SU2 v5 for a 2D Incomp. RANS case for a very simple airfoil but it never converges?

I tried to reduce the CFL no , Multigrid = 0 , Used JST and ROE
Increased the Max number of iterations of the linear solver for the implicit formulation to a 100
Never converge, the residuals in the beginning increase and the Cd increase, then at some point the residuals fluctuate around a certain value and the Cd keeps decreasing

I'd appreciate any help )
Thanks very much
Moharam is offline   Reply With Quote

Old   December 30, 2019, 20:25
Default
  #2
Member
 
Join Date: Dec 2019
Posts: 30
Rep Power: 6
jcownbey is on a distinguished road
Moharam,

First, I would check to make sure you have an adequate mesh and the correct BC's and rerun the simulation. Usually a CFL= 1 is a good start for an airfoil. I'd also increase the number of iterations. The residuals only indicate when to start checking for convergence of the solution and do not indicate when convergence actually occurs. (e.g. the residual can converge, but your solution may not necessarily converge). You may need to visualize a variable between two different iteration numbers a few hundred iterations apart.

If you require more help, then you should post your config file and maybe a picture of your mesh.
jcownbey 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
Airfoil simulation - Divergence of the results - Mesh or geometry problem ? Pol.P FLUENT 9 March 7, 2022 17:21
[ANSYS Meshing] Help with element size sandri_92 ANSYS Meshing & Geometry 14 November 14, 2018 07:54
Optimization Problem of ONERA M6 wing in SU2 lbfhappy SU2 Shape Design 0 November 10, 2017 08:31
divergence problem santu Main CFD Forum 0 October 31, 2014 00:58
Divergence problem Smaras FLUENT 13 February 21, 2013 05:03


All times are GMT -4. The time now is 04:09.