surface Normals

madhukar_nal · July 9, 2010, 05:38

Hi to all..
I generated 3D unstructured Mesh in gridgen. Now need surface normals.
So can anybody know how to take surface normals, by any commercial software package & aslo by C Programming..
Plz reply me ...

---
Madhukar

DoHander · July 9, 2010, 07:49

Check any good Finite Element book and you should find this described in details: for a given planar surface (a polygonal face) take two intersecting vectors and calculate their cross product, this will give you the normal to that surface ...

Also you can try ... Google:

http://www.opengl.org/wiki/Calculating_a_Surface_Normal

Do

Do

madhukar_nal · July 12, 2010, 00:18

Thank Q for reply,
Is there any method to get surface normals by commercial CFD softwares?..

July 9, 2010, 05:38	surface Normals	#1
madhukar_nal New Member Madhukar@NAL Join Date: Mar 2010 Posts: 13 Rep Power: 16	Hi to all.. I generated 3D unstructured Mesh in gridgen. Now need surface normals. So can anybody know how to take surface normals, by any commercial software package & aslo by C Programming.. Plz reply me ... --- Madhukar

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[Gmsh] Error : Self intersecting surface mesh, computing intersections & Error : Impossible	velan	OpenFOAM Meshing & Mesh Conversion	3	October 22, 2015 11:05
[Gmsh] Problem with Gmsh	nishant_hull	OpenFOAM Meshing & Mesh Conversion	23	August 5, 2015 02:09
Algorithm for finding surface normals	Deevyendu	Main CFD Forum	1	July 2, 2010 20:34
[Gmsh] boundaries with gmshToFoam‏	ouafa	OpenFOAM Meshing & Mesh Conversion	7	May 21, 2010 12:43
CFX4.3 -build analysis form	Chie Min	CFX	5	July 12, 2001 23:19

July 9, 2010, 07:49		#2
DoHander Senior Member Join Date: Nov 2009 Posts: 411 Rep Power: 19	Check any good Finite Element book and you should find this described in details: for a given planar surface (a polygonal face) take two intersecting vectors and calculate their cross product, this will give you the normal to that surface ... Also you can try ... Google: http://www.opengl.org/wiki/Calculating_a_Surface_Normal Do Do

July 12, 2010, 00:18		#3
madhukar_nal New Member Madhukar@NAL Join Date: Mar 2010 Posts: 13 Rep Power: 16	Thank Q for reply, Is there any method to get surface normals by commercial CFD softwares?..