blockMesh prism undefined faces
 

Hello,

I am trying to create a mesh using blockMesh around a prismatic object. The mesh block under this object is triangular. According to the User Guide pp. U-139 paragraph 5.3.3, one can create this by collapsing vertices. This is what I did, and the mesh looks good.

I define the patches as you can see in the attachment. When running "blockMesh", I get the following warning:

Indeed this gives an error when solving later. I cannot find the patch "empty" nor "defaultFaces" in my postprocessor (paraview 3.7), anyways.

Who knows what went wrong?

You have forgotten the attachment.

Best regards,

Niels

Thank you Niels, for making me aware of that. Uploading keeps on failing here, so this is a copy of my blockMeshDict file:


/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 1.6 |
| \\ / A nd | Web: http://www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //



convertToMeters 1;

vertices
(
(-20 0 -4)
(-20 25 -4)
(-4 0 -4)
(-4 25 -4)
(0 1 -4)
(0 25 -4)
(4 0 -4)
(4 25 -4)
(50 0 -4)
(50 25 -4)

(-20 0 -1)
(-20 25 -1)
(-4 0 -1)
(-4 25 -1)
(0 1 -1)
(0 25 -1)
(4 0 -1)
(4 25 -1)
(50 0 -1)
(50 25 -1)

(-20 0 1)
(-20 25 1)
(-4 0 1)
(-4 25 1)
(0 1 1)
(0 25 1)
(4 0 1)
(4 25 1)
(50 0 1)
(50 25 1)
);

blocks
(
// Lower layer
hex (2 6 4 4 12 16 14 14)(4 4 12) simplegrading (1 1 1)
hex (0 2 3 1 10 12 13 11)(16 25 12) simpleGrading (1 1 1)
hex (2 4 5 3 12 14 15 13)(4 25 12) simpleGrading (1 1 1)
hex (4 6 7 5 14 16 17 15)(4 25 12) simpleGrading (1 1 1)
hex (6 8 9 7 16 18 19 17)(46 25 12) simpleGrading (1 1 1)

// Upper layer
hex (10 12 13 11 20 22 23 21)(16 25 12) simpleGrading (1 1 1)
hex (12 14 15 13 22 24 25 23)(4 25 12) simpleGrading (1 1 1)
hex (14 16 17 15 24 26 27 25)(4 25 12) simpleGrading (1 1 1)
hex (16 18 19 17 26 28 29 27)(46 25 12) simpleGrading (1 1 1)
);

edges
(
);

patches
(
patch XMIN
(
(0 1 11 10)
(10 11 21 20)
)
wall YMAX
(
(1 3 13 11)
(3 5 15 13)
(5 7 17 15)
(7 9 19 17)
(11 13 23 21)
(13 15 25 23)
(15 17 27 25)
(17 19 29 27)
)
patch XMAX
(
(8 9 19 18)
(18 19 29 28)
)
symmetryPlane YMIN
(
(0 2 12 10)
(2 6 16 12)
(6 8 18 16)
(10 12 22 20)
(16 18 28 26)
)
wall HULL
(
(12 16 14 14)
(12 14 24 22)
(14 16 26 24)
)
wall ZMIN
(
(2 6 4 4)
(0 2 3 1)
(2 4 5 3)
(4 6 7 5)
(6 8 9 7)
)
wall ZMAX
(
(20 22 23 21)
(22 24 25 23)
(24 26 27 25)
(26 28 29 27)
)
);

mergePatchPairs
(
);

// ************************************************** *********************** //

Apparently, the face

(4 14 14 4)

needs to be defined on the boundary as well. After applying that to any boundary patch, no defaultFace patch is generated.

Good luck,

Niels