Dear all, I am trying to un
 

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!!

Quinn

there is some info in programm
 

there is some info in programmers guide of the code in tutorials section

Quinn, I suppose that this is
 

Quinn,
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.
-David