[broccolibadger]

blockMesh with grading works like a charm without grading as per attached images A & B.

With grading specified and changing cyclic to wall, the mesh is generated beautifully. Problem starts when cyclic and grading is combined, see image C.

blockMeshDict is attached.

Gradings:

/*
gz0 1;
gz1 1;
gr 1;
*/

gz0 .1;
gz1
(
    (.3 3 1)
    (.7 2 5)
);
gr 10;

Patch specifications:

cyclicA
    {
        type            cyclic;
        neighbourPatch  cyclicB;

        transform       rotational;
        rotationAxis    (0 0 1);
        rotationCentre  (0 0 0);
//        rotationAngle   270;
        matchTolerance  1e-5;

        faces
            (
                (7 32 29 0)
                (32 10 3 29)
                (10 12 5 3)
                (10 17 19 12)
                (17 24 26 19)
                (35 38 24 17)
                (14 21 38 35)
            );
    }

    cyclicB
    {
        type            cyclic;
        neighbourPatch  cyclicA;

        transform       rotational;
        rotationAxis    (0 0 1);
        rotationCentre  (0 0 0);
//        rotationAngle   90;
        matchTolerance  1e-5;

        faces
            (
                (0 28 31 7)
                (28 1 8 31)
                (1 2 9 8)
                (9 16 15 8)
                (15 16 23 22)
                (22 37 15 34)
                (34 37 21 14)
            );
    }

Error message:

cyclicPolyPatch::calcTransforms : Writing cyclicA faces to OBJ file "cyclicA_faces.obj"
cyclicPolyPatch::calcTransforms : Writing cyclicB faces to OBJ file "cyclicB_faces.obj"
cyclicPolyPatch::calcTransforms : Writing coupled face centres as lines to "cyclicA_to_cyclicB.obj"


--> FOAM FATAL ERROR: 
face 1 area does not match neighbour by 25.44563% -- possible face ordering problem.
patch:cyclicA my area:4.1126e-05 neighbour area:3.184237e-05 matching tolerance:1e-05
Mesh face:6011 fc:(0 0.002292 0.01345746)
Neighbour fc:(0.000764 0 0.03733454)
If you are certain your matching is correct you can increase the 'matchTolerance' setting in the patch dictionary in the boundary file.
Rerun with cyclic debug flag set for more information.

    From void Foam::cyclicPolyPatch::calcTransforms(const primitivePatch&, const pointField&, const vectorField&, const pointField&, const vectorField&)
    in file meshes/polyMesh/polyPatches/constraint/cyclic/cyclicPolyPatch.C at line 215.

FOAM exiting

I'm using .com-version v2006

To me this looks like a bug in how cyclic is implemented. I can't seem to find any other reason for this not to work.