[ GiDlist ] Order of gauss points for 2D quad elements

[Valdenir de Souza Junior]

Hello,

The Gauss Points order and local axis position for Triangle and
Quadrilaterals are given on the page 185 of the GiD Reference Manual. On
this page the order of a 3x3 scheme is also pictured. The file of the GiD
Reference Manual (HTML, PDF and PS version) can be dowloaded at
http://gid.cimne.upc.es/download/do05.html

Regards

Valdenir de Souza Junior
Centro de Mecânica Aplicada e Computacional - CEMACOM
Federal University of Rio Grande do Sul - UFRGS
Porto Alegre, Brazil

At 23:12 24/09/01 +0100, you wrote:
Hello,

What is the numbering order used by GiD for gauss points in standard
locations
in 2D quadrilateral elements ?

To give some background, I am using a program called NONSAP which
outputs gauss point stresses only for most of its material models. It
uses this convention for a 4 node element with node order I-J-K-L:

J I
•-----------•
| |
| 2 4 | 1,2,3,4 are the 2x2 gauss point locations
| |
| 1 3 |
| |
•-----------•
K L

The above produced strange results on GiD.

Using the order below seemed to produce better results visualising on
GiD for a test problem:

J I
•-----------•
| |
| 2 1 | 1,2,3,4 are the 2x2 gauss point locations
| |
| 3 4 |
| |
•-----------•
K L

So does GiD use this order, or is it something more complicated
altogether? Also how does GiD number the gauss points for a 3x3 scheme?
I can't find any info in the documentation on the number ordering issue.
Hopefully above diagrams are not messed up on transmission.

Regards

Dave Gardner