How to calculate the facet normal for a triangle element

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dreamchaser
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Posts: 3
Joined: Wed Aug 09, 2017 6:12 am
Location: Belgium

How to calculate the facet normal for a triangle element

Postby dreamchaser » Wed Mar 06, 2019 2:04 pm

Hello,

Right now I have a data format file (below) where each row corresponds to a node, and each column corresponds to a variable.
Thus, for every three lines, the values for the variables are repeated, since each node of a triangle is assumed to have the same value.
I believe this is the triangle data in point format. I would like to output a file that has the normal vector for each node.

variables = x y z flux
zone T="sampling", n= 2430 , e= 810 , et=triangle,f=fepoint
0.243636995E-03 0.250523420E-03 0.292066356E-04 0.570100000E+04
0.244069267E-03 0.248489737E-03 0.292066353E-04 0.570100000E+04
0.243637000E-03 0.250523420E-03 0.392066356E-04 0.570100000E+04

I would like to output a file that has the facet normal (nx,ny,nz) at each node:

variables = x y z flux nx ny nz
zone T="sampling", n= 2430 , e= 810 , et=triangle,f=fepoint
0.243636995E-03 0.250523420E-03 0.292066356E-04 0.570100000E+04 nx ny nz


Is there a way for me to calculate the normal vector for each triangle?
I did see an option under "Analyze", "Calculate Variables", and came across "Grid I Unit Normal"
but was not sure this was correct?

I appreciate any advice. My version of Tecplot:Tecplot 360 EX 2018 R2, Version 2018.2.0.92317 (Oct 16 2018)

Thanks for your time,

dreamchaser

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