CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM

OpenFoam queries

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

LinkBack Thread Tools Display Modes
Old   September 30, 2009, 04:42
Exclamation OpenFoam queries
New Member
Join Date: Jul 2009
Location: Braunschweig, Germany
Posts: 28
Rep Power: 10 is on a distinguished road

I have a few queries with a few openfoam settings:
  • northogonalcorrectors :What is the exact function of this keyword?
I read from thes userguide that it has to be between 0 and 60, 0-Hexahedral mesh. I have obtained this from the checkMesh utility
Mesh non-orthogonality Max:61.5 average:12.4196
Does this mean i have to use northogonalcorrectors as 12?
  • InternalField : I have successfully implemented the K-omega SST turbulence model for my simulation for inlet and outlet. But, i am not sure how to define the InternalField for the turbulence parameters such as 'k', 'omega' and 'epsilon'.
  • Time averaging : I am running a transient simulation and the residuals on my simulation are continiously fluctuating. How can i obtain a time averaged results starting from a certain time step? So, as to check if my computation has converged.
Please enlighten me about these functions.

Thnx 2 everyone in advance!!!


p.s: I have a tetrahedral mesh with 10 laminar sub-layers near the wall.

Last edited by; September 30, 2009 at 05:00. is offline   Reply With Quote

Old   September 30, 2009, 19:09
Assistant Moderator
Bernhard Gschaider
Join Date: Mar 2009
Posts: 4,045
Rep Power: 43
gschaider will become famous soon enoughgschaider will become famous soon enough
Originally Posted by annoyed View Post
>I read from thes userguide...

You didn't read the User Guide, or you would know how non-orthogonal corrections are used.

>Please enlighten me about these functions.

which functions?

>p.s: I have a tetrahedral mesh with 10 laminar sub-layers near the wall.
Hi "annoyed"!

I had a look at your profile. 14 posts and all of them of a similar "witty"/unhelpful variety. I think they would be much funnier if you posted them under your real name. Getting an additional anonymous account (and I guess this is your second account) is a bit childish.

If you don't think that these questions are not up to your standards ignore them. It works for most of us

gschaider is offline   Reply With Quote

Old   October 1, 2009, 03:12
Join Date: Jun 2009
Posts: 36
Rep Power: 10
dipling is on a distinguished road
annoyed is just a dump kiddy or frustrated old man, ignore him.
dipling is offline   Reply With Quote

Old   October 1, 2009, 06:46
New Member
Giovanni Ricci
Join Date: May 2009
Posts: 12
Rep Power: 10
gricci is on a distinguished road
Send a message via Skype™ to gricci
for a clear overview on the meaning and effects of orthogonal correctors refer to Hrvoje's PhD thesis, section 3.7
(available somewhere online )
gricci is offline   Reply With Quote

Old   October 1, 2009, 07:26
New Member
Join Date: Jul 2009
Location: Braunschweig, Germany
Posts: 28
Rep Power: 10 is on a distinguished road

Thank you all for defending me and bearing with my naive questions. I read a lot of threads from the forum and have understood more about orthogonalcorrectors and time averaging of the solution files.

But, i have still not been able to define the Internalfield's for the turbulence parameters. Any help or suggestion of realted threads/topics would be very helpful.


varun is offline   Reply With Quote

Old   October 1, 2009, 10:07
New Member
Valentin Fischer
Join Date: Aug 2009
Location: Germany
Posts: 9
Rep Power: 10
Valle is on a distinguished road

you can define the internal field by using the following syntax. You have to do that for all of your variables you define in the "0" directory. One hint: Check the value for k which you define in your inlet boundary condition. The value of k has a not negligible influence on the flow downstream even on the flow which is far away from the inlet.
This effect I try to understand right now. Any hints or explanations for this are welcome.

Kind regards

version 2.0;
format ascii;
class volScalarField;
location "0";
object k;
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 2 -2 0 0 0 0];

internalField uniform 0.01;

type zeroGradient;
type zeroGradient;
type zeroGradient;
type zeroGradient;
type fixedValue;
value uniform 50;
type zeroGradient;

// ************************************************** *********************** //
Valle is offline   Reply With Quote


mesh quality, time average, turbulence model

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
Superlinear speedup in OpenFOAM 13 msrinath80 OpenFOAM Running, Solving & CFD 18 March 3, 2015 06:36
Modified OpenFOAM Forum Structure and New Mailing-List pete Site News & Announcements 0 June 29, 2009 05:56
64bitrhel5 OF installation instructions mirko OpenFOAM Installation 2 August 12, 2008 18:07
Adventure of fisrst openfoam installation on Ubuntu 710 jussi OpenFOAM Installation 0 April 24, 2008 14:25
OpenFOAM Debian packaging current status problems and TODOs oseen OpenFOAM Installation 9 August 26, 2007 13:50

All times are GMT -4. The time now is 02:13.