[pawansut]

What is the difference between “Grid I Unit Normal”, “Grid J Unit Normal” and “Grid K Unit Normal”?


In 'Tecplot-> Analyze -> Calculate Variable' there are three types of Unit Normals listed namely "Grid I Unit Normal", "Grid J Unit Normal" and "Grid K Unit Normal".

I want to know the difference between them!

Thanks and Regards

[wsfowler]

These are unit normals that point normal to the I-, J- or K-plane, in the plus-index direction. Appendix section F-3.1 briefly discusses these, but makes no mention of meaning or behavior for FE zones.

Only Grid K Unit Normal is meaningful for finite element surface zones; the direction it points is determined by cell right-hand rule.

Regards,
Scott

[pawansut]

Scott: Thanks for your reply. It is really helpful and gave me some idea.
Although if you find anything regarding meaning of 'Grid I Unit Normal' and 'Grid J Unit Normal' please let me know.

Thanks and Regards
pawansut

Originally Posted by wsfowler

These are unit normals that point normal to the I-, J- or K-plane, in the plus-index direction. Appendix section F-3.1 briefly discusses these, but makes no mention of meaning or behavior for FE zones.

Only Grid K Unit Normal is meaningful for finite element surface zones; the direction it points is determined by cell right-hand rule.

Regards,
Scott

[wsfowler]

Grid I Unit Normal and Grid J Unit Normal are only meaningful for structured grids. They represent the normal in the positive I- and J-
directions respectively. Grid K Unit Normal is meaningful for both structured and unstructured grids. For structured grids it is the normal in the positive K- direction. For unstructured grids it is the normal for surface cells (triangles & quads) in the direction determined by the right-hand rule.

Hopefully that provides a more explicit definition for you.

[pawansut]

Scott: Yes! Indeed. Thanks a lot.
I needed this explanation.

Thanks and Regards
pawansut

Originally Posted by wsfowler

Grid I Unit Normal and Grid J Unit Normal are only meaningful for structured grids. They represent the normal in the positive I- and J-
directions respectively. Grid K Unit Normal is meaningful for both structured and unstructured grids. For structured grids it is the normal in the positive K- direction. For unstructured grids it is the normal for surface cells (triangles & quads) in the direction determined by the right-hand rule.

Hopefully that provides a more explicit definition for you.