[Woody8]

Hi dear forum readers

First, the boring thing: My CFD-experiences are years behind. However, I installed CAElinux with OpenFOAM and would like to simulate an external flow around a cube (3-dimensional). The goal is actually to do a parameter study, involving different flow directions and cube sizes.

I have started to look at the basic tutorials, from where I have a rough idea about the blockMesh utility. I then decided to try it with blockMesh, because I would like to control the mesh as much as possible (because of the planned post-processing, which is another story).

However, upon my understanding how the blockMesh works, I set up a case (see case descriptions). Running blockMesh results in this error:

--> FOAM FATAL ERROR:
Trying to specify a boundary face 4(5 21 22 6) on the face on cell 1 which is either an internal face or already belongs to some other patch. This is face 0 of patch 3 named cube.

----- this works... ------
If I don' "patch" the cube, blockMesh and checkMesh runs through (unfortunately Paraview crashes - so there might be other problems :-(

cube
{
type wall;
faces
(
//(5 21 22 6) // 0
//(9 25 26 10) // 1
//(5 9 25 21) // 2
//(6 10 26 22) // 3
//(21 22 26 25) // 4

);
}
-----------------------------------------
Can someone help me with this problem?
General question: Does my concept (numbering, etc.) work?

Best regards,
Woody8

--------- blockMeshDict ------

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.1.x |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 1 ;

vertices
(
(0 0 0) // 0
(5 0 0) // 1
(6 0 0) // 2
(11 0 0) // 3
(0 5 0) // 4
(5 5 0) // 5
(6 5 0) // 6
(11 5 0) // 7
(0 6 0) // 8
(5 6 0) // 9
(6 6 0) // 10
(11 6 0) // 11
(0 11 0) // 12
(5 11 0) // 13
(6 11 0) // 14
(11 11 0) // 15
(0 0 1) // 16
(5 0 1) // 17
(6 0 1) // 18
(11 0 1) // 19
(0 5 1) // 20
(5 5 1) // 21
(6 5 1) // 22
(11 5 1) // 23
(0 6 1) // 24
(5 6 1) // 25
(6 6 1) // 26
(11 6 1) // 27
(0 11 1) // 28
(5 11 1) // 29
(6 11 1) // 30
(11 11 1) // 31
(0 0 6) // 32
(5 0 6) // 33
(6 0 6) // 34
(11 0 6) // 35
(0 5 6) // 36
(5 5 6) // 37
(6 5 6) // 38
(11 5 6) // 39
(0 6 6) // 40
(5 6 6) // 41
(6 6 6) // 42
(11 6 6) // 43
(0 11 6) // 44
(5 11 6) // 45
(6 11 6) // 46
(11 11 6) // 47

);

blocks
(
hex (0 1 5 4 16 17 21 20) (20 20 20) simpleGrading (1 1 1) // Block 0
hex (1 2 6 5 17 18 22 21) (20 20 20) simpleGrading (1 1 1) // Block 1
hex (2 3 7 6 18 19 23 22) (20 20 20) simpleGrading (1 1 1) // Block 2
hex (4 5 9 8 20 21 25 24) (20 20 20) simpleGrading (1 1 1) // Block 3
hex (5 6 10 9 21 22 26 25) (20 20 20) simpleGrading (1 1 1) // Block 4
hex (6 7 11 10 22 23 27 26) (20 20 20) simpleGrading (1 1 1) // Block 5
hex (8 9 13 12 24 25 29 28) (20 20 20) simpleGrading (1 1 1) // Block 6
hex (9 10 14 13 25 26 30 29) (20 20 20) simpleGrading (1 1 1) // Block 7
hex (10 11 15 14 26 27 31 30) (20 20 20) simpleGrading (1 1 1) // Block 8
hex (16 17 21 20 32 33 37 36) (20 20 20) simpleGrading (1 1 1) // Block 9
hex (17 18 22 21 33 34 38 37) (20 20 20) simpleGrading (1 1 1) // Block 10
hex (18 19 23 22 34 35 39 38) (20 20 20) simpleGrading (1 1 1) // Block 11
hex (20 21 25 24 36 37 41 40) (20 20 20) simpleGrading (1 1 1) // Block 12
hex (21 22 26 25 37 38 42 41) (20 20 20) simpleGrading (1 1 1) // Block 13
hex (22 23 27 26 38 39 43 42) (20 20 20) simpleGrading (1 1 1) // Block 14
hex (24 25 29 28 40 41 45 44) (20 20 20) simpleGrading (1 1 1) // Block 15
hex (25 26 30 29 41 42 46 45) (20 20 20) simpleGrading (1 1 1) // Block 16
hex (26 27 31 30 42 43 47 46) (20 20 20) simpleGrading (1 1 1) // Block 17
);

edges
(
);

boundary
(
inlet
{
type wall;
faces
(
(0 4 20 16) // 0
(4 8 24 20) // 1
(8 12 28 24) // 2
(16 20 36 32) // 3
(20 24 40 36) // 4
(24 28 44 40) // 5
(12 13 29 28) // 6
(13 14 30 29) // 7
(14 15 31 30) // 8
(28 29 45 44) // 9
(29 30 46 45) // 10
(30 31 47 46) // 11

);
}

outlet
{
type wall;
faces
(
(3 7 23 19) // 0
(7 11 27 23) // 1
(11 15 31 27) // 2
(19 23 39 35) // 3
(23 27 43 39) // 4
(27 31 47 43) // 5
(0 1 17 16) // 6
(1 2 18 17) // 7
(2 3 19 18) // 8
(16 17 33 32) // 9
(17 18 34 33) // 10
(18 19 35 34) // 11

);
}

bottom
{
type wall;
faces
(
(0 1 5 4) // 0
(1 2 6 5) // 1
(2 3 7 6) // 2
(4 5 9 8) // 3
(5 6 10 9) // 4
(6 7 11 10) // 5
(8 9 13 12) // 6
(9 10 14 13) // 7
(10 11 15 14) // 8

);
}

cube
{
type wall;
faces
(
(5 21 22 6) // 0
(9 25 26 10) // 1
(5 9 25 21) // 2
(6 10 26 22) // 3
(21 22 26 25) // 4

);
}

empty
{
type wall;
faces
(
(32 33 37 36) // 0
(33 34 38 37) // 1
(34 35 39 38) // 2
(36 37 41 40) // 3
(37 38 42 41) // 4
(38 39 43 42) // 5
(40 41 45 44) // 6
(41 42 46 45) // 7
(42 43 47 46) // 8

);
}

);

mergePatchPairs

(
);

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