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

Constant Initial Residuals and divergence

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   May 24, 2016, 05:44
Default Constant Initial Residuals and divergence
  #1
New Member
 
G.Bevensee
Join Date: Mar 2016
Posts: 3
Rep Power: 10
Gubevens is on a distinguished road
Hey Guys,

I`m running a simulation with rhoSimpleFoam solver, LRR turbulence model and a mesh with 1.8 M tetraedrons.

During the first 100 Iterations my epsilons residuals are constant (like 0.3). After that it rises to one and falls again. It does not blow up.
See the attached picture.
In my eyes this is not ok, so my question is how can i fix that to get a convergence? Or is this behaviour not considerable?

info: the same case does converge with kEpsilon model after 4500 Iterations. CheckMesh Ok.

Thank you in advance

----------------------------------------------------------------------
Here is the fvSchemes Setup
----------------------------------------------------------------------
ddtSchemes
{
default steadyState;
}

gradSchemes
{
default cellLimited Gauss linear 1.0;
}

divSchemes
{
default bounded gauss upwind;;

div(phi,U) bounded Gauss upwind;
div(((rho*(thermo:mu|(p*thermosi)))*dev2(T(grad( U))))) Gauss linear;
div(phi,K) bounded Gauss linear;
div(phi,h) bounded Gauss upwind;
div(phi,epsilon) bounded Gauss upwind;
div(phi,k) bounded Gauss upwind;
div(phi,Ekp) bounded Gauss upwind;
div((rho*R)) Gauss linear;
div(phi,R) bounded Gauss linear;
div(((rho*nuEff)*dev2(T(grad(U))))) Gauss linear;
}

laplacianSchemes
{
default Gauss linear corrected;
}

interpolationSchemes
{
default linear;
}

snGradSchemes
{
default corrected;
}

wallDist
{
method meshWave;
}
Attached Images
File Type: jpg residualsLRR.jpg (71.5 KB, 28 views)
Gubevens is offline   Reply With Quote

Reply

Tags
epsilon bounds, openfoam 3.0.1, residuals, rhosimplefoam rhopisofoam


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
fluent divergence for no reason sufjanst FLUENT 2 March 23, 2016 16:08
Turbine model - sudden divergence after stabilized residuals Octagon CFX 3 May 27, 2013 18:48
divergence of scaled residuals (steady simulation) hanka FLUENT 6 December 16, 2010 04:45
divergence in energy residuals swarley FLUENT 2 May 22, 2008 08:09
Divergence of residuals Manoj Kumar FLUENT 1 February 27, 2005 04:21


All times are GMT -4. The time now is 07:57.