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9.3 Node ordering
For all mesh and post-processing file formats, the reference elements are defined as follows. For high-order elements, the ordering of the edges/quad faces defines the ordering of high-order vertices associated with edges/faces.
Point:
v
|
|
-----1-----u
|
|
|
Line:
edge 1: nodes 1 2
v
|
|
--1-----2--u
|
|
|
Triangle:
edge 1: nodes 1 2
v 2: 2 3
| 3: 3 1
|
3
|\
| \
|__\___u
1 2
|
Quadrangle:
edge 1: nodes 1 2 quad. face 1: nodes 1 2 3 4
v 2: 2 3
| 3: 3 4
4--|--3 4: 4 1
| | |
-----------u
| | |
1--|--2
|
|
Tetrahedron:
edge 1: nodes 1 2
v 2: 2 3
| 3: 3 1
| 4: 4 1
| 5: 4 3
3 6: 4 2
|\
| \
|__\2_____u
1\ /
\4
\
w
|
Hexahedron:
edge 1: nodes 1 2 quad. face 1: nodes 1 4 3 2
v 2: 1 4 2: 1 2 6 5
| 3: 1 5 3: 1 5 8 4
| 4: 2 3 4: 2 3 7 6
4----|--3 5: 2 6 5: 3 4 8 7
|\ | |\ 6: 3 4 6: 5 6 7 8
| 8-------7 7: 3 7
| | ----|---u 8: 4 8
1-|---\-2 | 9: 5 6
\| \ \| 10: 5 8
5-----\-6 11: 6 7
\ 12: 7 8
w
|
Prism:
edge 1: nodes 1 2 quad. face 1: nodes 1 2 5 4
v 2: 1 3 2: 1 4 6 3
3 | 3: 1 4 3: 2 3 6 5
|\| 4: 2 3
| | 5: 2 5
1_|2 6: 3 6
\| 6 7: 4 5
|_|_\___u 8: 4 6
\| \ 9: 5 6
4 __5
\
\
w
|
Pyramid:
edge 1: nodes 1 2 quad. face 1: nodes 1 4 3 2
v 2 1 4
| 3 1 5
| 4 2 3
4---|---3 5 2 5
| \ | /| 6 3 4
| \ -/-|---u 7 3 5
| / 5\ | 8 4 5
1/----\-2
\
\
w
|
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