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

Mesh is ok but no convergence

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

LinkBack Thread Tools Display Modes
Old   July 25, 2007, 07:46
Default Hello, Im computing in Simp
Posts: n/a

Im computing in SimpleFoam the flowcase of an object in a wind tunnel. The mesh is a structured one and checkMesh tells me its perfect. Im working with the k- Epsilon realizable- turbulence. After running potentialFoam the given flow for the timestep "0" looks great, so my boundary conditions might be ok too.
My problem is, even with upwind- descritisation and turbulence turned off it isn't converging and I have no idea why.

So I set the relaxation factors step by step down to:
p 0.1
U 0.2
k 0.2
Epsilon 0.2

but with no effect. Does anyone of you have a clue what could be the problem? Or does anyone had a similar problem and solved it in past?

I would be happy for some hints, thank you
  Reply With Quote

Old   July 26, 2007, 10:57
Default Hi RW, I use simpleFoam too
Join Date: Mar 2009
Location: Lausanne, Switzerland
Posts: 60
Rep Power: 10
lam is on a distinguished road
Hi RW,

I use simpleFoam too (turbulence off, but in laminar)
And i have a "better" convergence when I increase the relaxation factors:
U -> 0.8
p -> 0.3

But maybe, we'are not in the same case, because I do not use k-epsilon.


lam is offline   Reply With Quote

Old   July 28, 2007, 07:07
Default Hi Lam, thank you for your
Posts: n/a
Hi Lam,

thank you for your answer, I will check out, if this may help me too.

  Reply With Quote


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
Mixed mesh nonothogonalcorr and the convergence sven82 OpenFOAM Meshing & Mesh Conversion 0 December 10, 2008 10:59
Convergence moving mesh lr103476 OpenFOAM Running, Solving & CFD 30 November 19, 2007 15:09
mesh quality and convergence Ed Schaub FLUENT 2 April 24, 2006 10:55
Convergence on skewed mesh ales FLUENT 5 April 18, 2001 09:00
Convergence problem when ustructured mesh is used. SangJin Ryu Siemens 3 October 5, 2000 20:26

All times are GMT -4. The time now is 17:55.