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[Technical] BlockMesh not making arcs

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Old   July 6, 2010, 07:54
Default BlockMesh not making arcs
  #1
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G B
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Hi, i've been reading the userguide on how to do simple arcs (and it seems simple enough) but for some reason, it's not working for me.

Here is my mesh:

vertices
(
(0 -1.35 0) //0
(10.235 -6.835 0) //1
(10.235 6.835 0) //2
(0 1.35 0) //3
(0 -1.35 4.45) //4
(10.235 -6.835 4.45) //5
(10.235 6.835 4.45) //6
(0 1.35 4.45) //7

);

blocks
(
hex (0 1 2 3 4 5 6 7) (10 1 100) simpleGrading (1 1 10)

);

edges
(
arc 1 2 (11.5 0.0 0.0)
arc 5 6 (11.5 0.0 4.45)
);

patches
(

patch walls
(
(0 4 7 3)
(0 1 5 4)
(1 2 6 5)
(2 3 7 6)
(3 2 1 0)
(4 5 6 7)
)
);

mergePatchPairs
(
);

//-----//

As you can see, the edge is defined accordingly. But when i create my mesh and use paraview I get a straight line instead of an arc. I assume it's something quite simple (as my past enquiries have turned out to be). But i am stumped here.

Thanks in advance!
GB
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Old   July 6, 2010, 10:03
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Update:

FIXED! I ended up copying the blockmeshdict from the stress analysis tutorial and modifying the vertex and the arcs accordingly and it worked. Doing a line by line comparison it is exactly the same. I dont know what happened. So, for anyoe out there having trouble making arcs, just copy the blockmeshdict from the stress analysis tutorial, and modify accordingly. Best of luck!
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Old   July 6, 2010, 10:09
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Stefan Herbert
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Just for note:

the problem here was, that an arc was defined on an edge (1 2) with only one single cell. To create arcs, of course, you need some more cells along it.

Regards,
Stefan
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Old   July 6, 2010, 10:16
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Ofcourse, that was it. How embarassing. I should bite my tongue (or fingers) before i post. I thought i had set 10 cells for my y axis. And the tutorial case file has that and that is why it worked. Thank you for pointing that out to me. I can't believe it.

Thank you again, Stefan.
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