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December 26, 2007, 11:51 |
Dear all,
I am trying to un
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#1 |
Member
Quinn Tian
Join Date: Mar 2009
Posts: 62
Rep Power: 17 |
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 |
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December 27, 2007, 06:09 |
there is some info in programm
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#2 |
Member
Mojtaba Shahmohammadian
Join Date: Mar 2009
Posts: 73
Rep Power: 17 |
there is some info in programmers guide of the code in tutorials section
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December 27, 2007, 13:46 |
Quinn,
I suppose that this is
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#3 |
Member
David P. Schmidt
Join Date: Mar 2009
Posts: 71
Rep Power: 17 |
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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