# block with 6 vertices

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October 5, 2013, 04:10
block with 6 vertices
#1
Member

Hale
Join Date: May 2013
Posts: 53
Rep Power: 5
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.
Attached Images
 Geometry_baffle.jpg (31.9 KB, 22 views)

 October 5, 2013, 08:00 #2 Super Moderator   Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 9,659 Blog Entries: 39 Rep Power: 99 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: First split the square-like mesh into 2 triangles. Then split it again into 4 triangles. Then finally evolve to the mesh you want. Best regards, Bruno __________________ OpenFOAM: FAQ | Getting started Forum: How to get help, to post code/output and forum guide What am I doing/planning: blog/wiki Read this before sending me PM

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