# How to choose nNonOrthogonalCorrectors value

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 December 26, 2007, 12:51 Dear all, I am trying to un #1 Member   Quinn Tian Join Date: Mar 2009 Posts: 62 Rep Power: 8 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

 December 27, 2007, 07:09 there is some info in programm #2 Member   Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 8 there is some info in programmers guide of the code in tutorials section

 December 27, 2007, 14:46 Quinn, I suppose that this is #3 Member   David P. Schmidt Join Date: Mar 2009 Posts: 71 Rep Power: 8 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

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