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[blockMesh] Wedge shape meshing problem!

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Old   July 1, 2014, 20:44
Question Wedge shape meshing problem!
  #1
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Kerem Aydemir
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Hi everyone. I am trying to build a wedged-shape(or you can say pyramid-shape) geometry like the one in Table 5.1 in the Manual. However I couldn't achieve this. I used the same structure given in the Manual 5.3.3 but I get an error as of below:
face 1 in patch 0 does not have neighbour cell face: 4(1 2 4 3)

I do not know what it means I checked my vertices and assigned them anti-clockwise. Here is a copy of this small mesh. Can you help me about it?

vertices
(
(0 0 0)
(11.18111 4.98 0)
(11.18111 -4.98 0)
(11.18111 -4.98 1.7)
(11.18111 4.498 1.7)
);

blocks
(
hex (0 1 2 2 3 4 4 3) (20 20 20) simpleGrading (1 1 1)
);

edges
(
);

boundary
(
fixedWalls
{
type wall;
faces
(
(0 1 2 2)
(1 2 3 4)
(0 1 4 4)
(0 2 3 3)
);
}
fixedWalls
{
type empty;
faces
(
(3 4 4 3)
);
}

);
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Old   July 4, 2014, 04:22
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Victorien
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Hello,

I'm new to OpenFOAM but I tried to understand your problem.

I think the fifth coord is 4.98 (instead of 4.498). Then which form do you want to create with 5 points ? I thought it could be only the pyramid or the tet-wedge (according to the user guide).

And another issue is that the number of faces have to be lower than the number of vertices. (One more time, I guess, except if you create internal faces)

Maybe someone else can respond...

Victorien
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Old   July 7, 2014, 16:06
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  #3
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Kerem Aydemir
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Quote:
Originally Posted by Victorien View Post
Hello,

I'm new to OpenFOAM but I tried to understand your problem.

I think the fifth coord is 4.98 (instead of 4.498). Then which form do you want to create with 5 points ? I thought it could be only the pyramid or the tet-wedge (according to the user guide).

And another issue is that the number of faces have to be lower than the number of vertices. (One more time, I guess, except if you create internal faces)

Maybe someone else can respond...

Victorien
Thank you Victorien. It was a typo mistake with the correct number I still got the error however that was only to see something else. Now I changed the structure and trying to build a mesh for a wind tunnel but thank you for the help.
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Old   August 20, 2014, 10:50
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problem was in the definiton of the hex block. It should work, if you use this code:

Code:
vertices
(
    (0 0 0)
    (11.18111 4.98 0)
    (11.18111 -4.98 0)
    (11.18111 -4.98 1.7)
    (11.18111 4.98 1.7)
);

blocks
(
    //hex (0 1 2 2 3 4 4 3) (20 20 20) simpleGrading (1 1 1)
    hex (0 0 4 3 0 0 1 2) (20 20 20) simpleGrading (1 1 1)
);

edges
(
);

boundary
(
    fixedWalls
    {
        type wall;
        faces
        (    
            (0 0 1 2)
            (0 0 2 3)
            (0 0 4 3)
            (0 0 1 4)
        );
    }
    fixedWalls
    {
        type empty;
        faces
        (
            (3 4 1 2)
        );
    }

);
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blockmesh, cell face, coincidence, pyramid, wedge

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