"FOAM FATAL ERROR: inconsistent number of faces between block pair ... and ..."
 

Hi everyone,

I'm a novice OpenFoam user and I got into the following error while running blockMesh on a multi-block structured 2D geometry:
"...

Creating block edges
No non-planar block faces defined
Creating topology blocks
Creating topology patches

Creating block mesh topology

Check topology

Basic statistics
Number of internal faces : 15
Number of boundary faces : 42
Number of defined boundary faces : 42
Number of undefined boundary faces : 0
Checking patch -> block consistency

Creating block offsets
Creating merge list

--> FOAM FATAL ERROR:
Inconsistent number of faces between block pair 0 and 2

From function void Foam::blockMesh::calcMergeInfo()
in file blockMesh/blockMeshMerge.C at line 222.

FOAM exiting
"



My blockMeshDict reads as follows:

"

convertToMeters 1;

vertices
(
(0 0 0)
(0.7 0 0)
(0.8 0 0)
(1 0 0)
(-0.2 -0.25 0)
(0 -0.25 0)
(0.7 -0.25 0)
(0.8 -0.25 0)
(1 -0.25 0)
(-0.2 -0.35 0)
(0 -0.35 0)
(0.7 -0.35 0)
(0.8 -0.35 0)
(1 -0.35 0)
(0 -0.6 0)
(0.7 -0.6 0)
(0.8 -0.6 0)
(1 -0.6 0)
(0.7 -0.8 0)
(0.8 -0.8 0)
(0.7 0.2 0)
(0.8 0.2 0)
(0 0 0.1)
(0.7 0 0.1)
(0.8 0 0.1)
(1 0 0.1)
(-0.2 -0.25 0.1)
(0 -0.25 0.1)
(0.7 -0.25 0.1)
(0.8 -0.25 0.1)
(1 -0.25 0.1)
(-0.2 -0.35 0.1)
(0 -0.35 0.1)
(0.7 -0.35 0.1)
(0.8 -0.35 0.1)
(1 -0.35 0.1)
(0 -0.6 0.1)
(0.7 -0.6 0.1)
(0.8 -0.6 0.1)
(1 -0.6 0.1)
(0.7 -0.8 0.1)
(0.8 -0.8 0.1)
(0.7 0.2 0.1)
(0.8 0.2 0.1)
);

blocks
(
hex (1 2 21 20 23 24 43 42) (10 20 1) simpleGrading (1 1 1) //0
hex (0 5 6 1 22 27 28 23) (70 25 1) simpleGrading (1 1 1) //1
hex (1 6 7 2 23 28 29 24) (10 25 1) simpleGrading (1 1 1) //2
hex (2 7 8 3 24 29 30 25) (20 25 1) simpleGrading (1 1 1) //3
hex (4 9 10 5 26 31 32 27) (20 10 1) simpleGrading (1 1 1) //4
hex (5 10 11 6 27 32 33 28) (70 10 1) simpleGrading (1 1 1) //5
hex (6 11 12 7 28 33 34 29) (10 10 1) simpleGrading (1 1 1) //6
hex (7 12 13 8 29 34 35 30) (20 10 1) simpleGrading (1 1 1) //7
hex (10 14 15 11 32 36 37 33) (70 25 1) simpleGrading (1 1 1) //8
hex (11 15 16 12 33 37 38 34) (10 25 1) simpleGrading (1 1 1) //9
hex (12 16 17 13 34 38 39 35) (20 25 1) simpleGrading (1 1 1) //10
hex (15 18 19 16 37 40 41 38) (10 20 1) simpleGrading (1 1 1) //11
);

edges
(
);

boundary
(
inlet
{
type patch;
faces
(
(4 26 31 9)
);
}

leftWall
{
type wall;
faces
(
(4 26 27 5)
(0 5 27 22)
(0 22 23 1)
(1 23 42 20)
(2 21 43 24)
(2 24 25 3)
(3 25 30 8)
);
}

rightWall
{
type wall;
faces
(
(9 10 32 31)
(10 14 36 32)
(14 15 37 36)
(15 18 40 37)
(16 38 41 19)
(16 17 39 38)
(13 35 39 17)
);
}

frontWall
{
type wall;
faces
(
(8 30 35 13)
);
}

frontAndBack
{
type empty;
faces
(
(1 20 21 2)
(23 24 43 42)
(0 1 6 5)
(22 27 28 23)
(1 2 7 6)
(23 28 29 24)
(2 3 8 7)
(24 29 30 25)
(4 5 10 9)
(26 31 32 27)
(5 6 11 10)
(27 32 33 28)
(6 7 12 11)
(28 33 34 29)
(7 8 13 12)
(29 34 35 30)
(10 11 15 14)
(32 36 37 33)
(11 12 16 15)
(33 37 38 34)
(12 13 17 16)
(34 38 39 35)
(15 16 19 18)
(37 40 41 38)

);
}

outlet
{
type patch;
faces
(
(20 42 43 21)
(18 19 41 40)
);
}
);

mergePatchPairs
(
);


"
I also attach below an image of the consituing blocks taken from ParaView.

As you can guess, I'm trying to create a mesh entirely made of cubic cells. However I still can't figure out why block 0 and 2 (and, I suppose, many others going through the code), which should be face-matched in the xz plane, are said to be inconsistent with respect to the number of shared faces :confused:.

Any idea or advice regarding the origin of the issue will be welcomed and highly appreciated :).

Thanks in advance:).