[jhanson2]

I'm trying to run blockmesh but I keep getting an error. the below is my error message. I don't know what i'm doing wrong. If could get another pair of eyes to look at this I would greatly appreciate it.

Actual Error Message:

"FOAM FATAL IO ERROR:
Block hex (0 1 2 3 4 5 6 7) (10 10 10) simpleGrading (1(1) 1(1) 1(1)) is inside-out

file: /home/jackhansonjr/OpenFOAM/openfoam5/tutorials/incompressible/pimpleDyMFoam/Torpedo/system/blockMeshDict.blocks at line 34.
"

blockmeshdict file:

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 5 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
object blockMeshDict;
}

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

convertToMeters 0.305;

vertices
(
(-10 -1.84 -1.84) // 0 - Left Bottom Back
(-10 -1.84 1.84) // 1 - Left Bottom Front
(-10 1.84 1.84) // 2 - Left Top Front
(-10 1.84 -1.84) // 3 - Left Top Back
(10 -1.84 -1.84) // 4 - Right Bottom Back
(10 -1.84 1.84) // 5 - Right Bottom Front
(10 1.84 1.84) // 6 - Right Top Front
(10 1.84 -1.84) // 7 - Right Top Back
);

blocks
(
hex (0 1 2 3 4 5 6 7) (10 10 10) simpleGrading (1 1 1)
);

edges
(
);

boundary
(
topAndBottom
{
type patch;
faces
(
(3 7 6 2)
(1 5 4 0)
);
}

inlet
{
type patch;
faces
(
(0 4 7 3)
);
}

outlet
{
type patch;
faces
(
(2 6 5 1)
);
}

symFront
{
type symmetryPlane;
faces
(
(4 5 6 7)
);
}

symBack
{
type symmetryPlane;
faces
(
(0 3 2 1)
);
}
);

mergePatchPairs
(
);

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

[DenysW]

Look up blockMesh in the openFoam instructions or a Wiki, and sketch and number your vertices. You've gone clockwise when blockMesh is expecting counter-clockwise or vice-versa, or not put in the lowest face as the first four vertices. Thus you think you're fine but blockMesh thinks your shape is inside-out.
After about 5 years of using blockMesh this is still my commonest error.