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block with 6 vertices

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Old   October 5, 2013, 04:10
Default block with 6 vertices
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Hale
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Hi

I'm trying to create a block with 6 vertices. I followed the instruction on page U-142 in the user Guide but I got some strange shape of the block. I guess it is because it assumes that the vertices on the collapsed side have the same y values, which is not the case in my problem.

I have attached a sketch of the geometry. There is no problem defining the 8-cornered blocks at the sides but the 6-cornered blocks are not easy to define if they have to have the right x, y, and z direction as the other 8-cornered blocks.

I tried the following:

8-cornered blocks
hex (7 3 11 15 4 0 8 12)
hex (0 1 9 8 4 5 13 12)
hex (2 6 14 10 1 5 13 9)
hex (7 6 14 15 3 2 10 11)

6-cornered blocks
hex (1 0 8 9 1 2 10 9)
hex (3 2 10 11 3 0 8 11)

This gives the right geometry but when I run the simulation it takes 20 times as much time to get results as when I remove the triangles in the middle and just define a square block!

Am I defining something wrong the two last blocks?

NB. I need these triangular blocks to define a wall in the middle afterwards.
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File Type: jpg Geometry_baffle.jpg (31.9 KB, 19 views)
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Old   October 5, 2013, 08:00
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Bruno Santos
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wyldckat is just really nicewyldckat is just really nicewyldckat is just really nicewyldckat is just really nice
Greetings Hale,

If you could provide an example case, it would be easier to experiment this ourselves.

Beyond this, my suggestion is to step back a few steps and use the cavity tutorial as an example for gradually creating collapsed edges. For example:
  1. First split the square-like mesh into 2 triangles.
  2. Then split it again into 4 triangles.
  3. Then finally evolve to the mesh you want.
Best regards,
Bruno
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