CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Visualization & Post-Processing Software > Tecplot

Grid I Unit Normal and Grid J Unit Normal

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

Like Tree1Likes
  • 1 Post By wsfowler

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 29, 2017, 15:20
Default Grid I Unit Normal and Grid J Unit Normal
  #1
New Member
 
Join Date: Jul 2017
Posts: 3
Rep Power: 8
pawansut is on a distinguished road
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
pawansut is offline   Reply With Quote

Old   July 31, 2017, 16:41
Default
  #2
Senior Member
 
Scott Fowler
Join Date: May 2009
Posts: 112
Rep Power: 16
wsfowler is on a distinguished road
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 is offline   Reply With Quote

Old   July 31, 2017, 17:37
Default
  #3
New Member
 
Join Date: Jul 2017
Posts: 3
Rep Power: 8
pawansut is on a distinguished road
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


Quote:
Originally Posted by wsfowler View Post
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 is offline   Reply With Quote

Old   July 31, 2017, 19:00
Default
  #4
Senior Member
 
Scott Fowler
Join Date: May 2009
Posts: 112
Rep Power: 16
wsfowler is on a distinguished road
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 likes this.
wsfowler is offline   Reply With Quote

Old   July 31, 2017, 19:14
Default
  #5
New Member
 
Join Date: Jul 2017
Posts: 3
Rep Power: 8
pawansut is on a distinguished road
Scott: Yes! Indeed. Thanks a lot.
I needed this explanation.

Thanks and Regards
pawansut



Quote:
Originally Posted by wsfowler View Post
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 is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
[ICEM] Output normal directions of grid nodes mars ANSYS Meshing & Geometry 0 January 18, 2016 11:04
Wall normal grid configuration in pipe hnemati Main CFD Forum 1 January 7, 2014 09:52
grid normal to wall lavdwall Main CFD Forum 3 January 7, 2014 05:19
grid software for normal vector cepheid Main CFD Forum 0 May 21, 2010 23:22
Grid Independent Solution Chuck Leakeas Main CFD Forum 2 May 26, 2000 12:18


All times are GMT -4. The time now is 13:52.