Page 224 - Basic Structured Grid Generation

Unstructured grid generation 213

5
6 4

10
3

7 2 3
4
9 2
6
1
5
8
1
Fig. 8.34 Seventh front.

• active nodes: 9, 10, 4, 5, 6, 7
• active sides: 9-10, 10-4, 4-5, 5-6, 6-7, 7-9
• passive nodes: 8, 1, 2, 3
• passive sides: 7-8, 8-1, 1-2, 2-3, 3-4
• npoint: 10
• nelem: 6
• nptr: 6

Now the side 7-9 is chosen, and the new equilateral triangle with centre K ideal
(Fig. 8.35) is valid. Thus K ideal becomes the new point 11, and the updated front is
as shown in Fig. 8.36, with properties:

• active nodes: 9, 10, 4, 5, 6, 7, 11
• active sides: 9-10, 10-4, 4-5, 5-6, 6-7, 7-11, 11-9
• passive nodes: 8, 1, 2, 3
• passive sides: 7-8, 8-1, 1-2, 2-3, 3-4
• npoint: 11

5
6 4

10
K id 3

7 2 3
4
9
2
6
1
5
8
1
Fig. 8.35 Side 7-9; ideal point.