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

How to choose nNonOrthogonalCorrectors value

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

Like Tree1Likes
  • 1 Post By schmidt_d

LinkBack Thread Tools Display Modes
Old   December 26, 2007, 12:51
Default Dear all, I am trying to un
Quinn Tian
Join Date: Mar 2009
Posts: 62
Rep Power: 10
qtian is on a distinguished road
Dear all,

I am trying to understand how to choose the parameter for nNonOrthogonalCorrectors. I searched " nNonOrthogonalCorrectors" in the message board and read every thread. However, for some reason, I can not find much information about it.

Someone happened to mention that use "checkMesh" to find information about mesh non-orthogonality and skewness.

Here is the information I got from "checkMesh"

Mesh non-orthogonality Max: 56.7059 average: 8.27139
Non-orthogonality check OK.

Face pyramids OK.

Max skewness = 76.5705 percent. Face skewness OK.

Minumum edge length = 0.0026. Maximum edge length = 0.0312349.

My question is how can I decide the nNonOrthogonalCorrectors value, based on above informaiton? is there any special formula?

Thanks for your help. Happy new year!!

qtian is offline   Reply With Quote

Old   December 27, 2007, 07:09
Default there is some info in programm
Mojtaba Shahmohammadian
Join Date: Mar 2009
Posts: 73
Rep Power: 10
msha is on a distinguished road
there is some info in programmers guide of the code in tutorials section
msha is offline   Reply With Quote

Old   December 27, 2007, 14:46
Default Quinn, I suppose that this is
David P. Schmidt
Join Date: Mar 2009
Posts: 71
Rep Power: 10
schmidt_d is on a distinguished road
I suppose that this is a matter of opinion and experience. Usually CFD codes use a deferred correction approach where the orthogonal part of the Laplacian is handled implicitly while the non-orthogonal part is treated explicitly. Generally, spatial errors in CFD dominate temporal errors. So I would say that if your code is running and stable, you are using enough non-orthogonal corrections. Start with 1 for nNonOrthogonalCorrectors and go from there. To learn more, look at H. Jasak's thesis and also Peric and Ferziger's CFD book.
chengdi likes this.
schmidt_d is offline   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
choose which pressure? pdz711 FLUENT 1 June 6, 2008 06:23
How to choose meshing? slaxmi CFX 1 September 13, 2007 05:19
how to choose Interface prateek jain CFX 3 July 11, 2007 23:56
Where can I choose RANS and RNG!!! maoasis FLUENT 4 May 2, 2006 17:19
Would someone help me choose? Xiaozhu Main CFD Forum 7 May 23, 2002 02:07

All times are GMT -4. The time now is 01:01.