More Scale the Mesh 2

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  4.1                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 0.1;

vertices
(
    (0 0 0)
    (1 0 0)
    (1 1 0)
    (0 1 0)
    (0 0 0.1)
    (1 0 0.1)
    (1 1 0.1)
    (0 1 0.1)
);
-----------------------------------------------------------------------------------

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  4.1                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       vectorField;
    location    "constant/polyMesh";
    object      points;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //


882
(
(0 0 0)
(0.005 0 0)
(0.01 0 0)
(0.015 0 0)
(0.02 0 0)
(0.025 0 0)
(0.03 0 0)
(0.035 0 0)
(0.04 0 0)
(0.045 0 0)
(0.05 0 0)
(0.055 0 0)
(0.06 0 0)
(0.065 0 0)
(0.07 0 0)
(0.075 0 0)
(0.08 0 0)
(0.085 0 0)
(0.09 0 0)
(0.095 0 0)
(0.1 0 0)
----------------------------------------------------------------------------------------------------

The step size is 0.1 / 20 or the "convertToMeters 0.1" divided by the number of patches "20".

What number of patches would one use for an irregular shape? Would it be based on the number of patches in the shortest face?

----------------------------------------------------------------------------------------------------

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  4.1                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       polyBoundaryMesh;
    location    "constant/polyMesh";
    object      boundary;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

3
(
    movingWall
    {
        type            wall;
        inGroups        1(wall);
        nFaces          20;
        startFace       760;
    }
    fixedWalls
    {
        type            wall;
        inGroups        1(wall);
        nFaces          60;
        startFace       780;
    }
    frontAndBack
    {
        type            empty;
        inGroups        1(empty);
        nFaces          800;
        startFace       840;
    }
)