CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

SimpleFoam solution convergence pattern

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 26, 2008, 14:18
Default Hello and a Good Evening to ev
  #1
Senior Member
 
Philippose Rajan
Join Date: Mar 2009
Location: Germany
Posts: 537
Rep Power: 17
philippose will become famous soon enough
Hello and a Good Evening to everyone :-)!

It has been a while since my last post with a basic CFD question :-)! So I hope as usual... that it does not come off as being too amateur...

I use simpleFoam for most of my CFD simulation cases, with the following configuration:

a. GAMG as the solver for pressure.
b. PBiCG solver with the DILU preconditioner for U, k and Epsilon.
c. Relaxation factors as 0.3 for all the variables (U, p, k, and epsilon).

My question is... can something general be said about the way simpleFoam with such a configuration would converge on a steady-state solution for the variables solved?

As in.... for example, does the pressure field always have an overshoot like a second order under-damped step response... or do all the variables approach the converged values like a highly damped second order response...etc...etc..?

Or is the convergence pattern very dependent on the mesh, and geometry of the case with no general trends based on solver characteristics?

And is there any way of being able to control this response pattern (if there is one) via the various solver parameters?

Have a nice day!

Philippose
philippose is offline   Reply With Quote

Reply

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
SimpleFoam convergence problems brahim OpenFOAM Running, Solving & CFD 20 June 9, 2015 09:09
SimpleFoam Convergence problem skabilan OpenFOAM Running, Solving & CFD 6 May 31, 2013 03:21
Convergence problem using simpleFoam steady state vvqf OpenFOAM Running, Solving & CFD 12 May 18, 2011 07:51
SimpleFoam convergence problems schnitzlein OpenFOAM Running, Solving & CFD 6 June 24, 2005 09:51
Axial 2D calculation in simpleFoam prblem with convergence rybakov OpenFOAM Running, Solving & CFD 3 May 16, 2005 02:00


All times are GMT -4. The time now is 00:34.