/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2006                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

scale   1;
verbose no;

// Geometric parameters
outerRadius 1;
innerRatio  0.5;

// Divisions in x/y/z and radial directions. Can be unequal.
nx   10;
ny   $nx;
nz   $nx;
nr   6;

geometry
{
    sphere
    {
        type    sphere;
        origin  (0 0 0);
        radius  $outerRadius;
    }

    innerSphere
    {
        $sphere
        radius  #eval{ $outerRadius * $innerRatio };
    }
}


// Outer box sizes (approximate)
vo   #eval{ sqrt($outerRadius/3) };
mvo  #eval{ -$vo };

// Inner box sizes - % of overall dimension
vi   #eval{ $vo * $innerRatio };
mvi  #eval{ -$mvo };

vertices
(
    // Inner block points
    project ($mvi $mvi $mvi) (innerSphere)
    project ( $vi $mvi $mvi) (innerSphere)
    project ( $vi  $vi $mvi) (innerSphere)
    project ($mvi  $vi $mvi) (innerSphere)
    project ($mvi $mvi  $vi) (innerSphere)
    project ( $vi $mvi  $vi) (innerSphere)
    project ( $vi  $vi  $vi) (innerSphere)
    project ($mvi  $vi  $vi) (innerSphere)

    // Outer block points
    project ($mvo $mvo $mvo) (sphere)
    project ( $vo $mvo $mvo) (sphere)
    project ( $vo  $vo $mvo) (sphere)
    project ($mvo  $vo $mvo) (sphere)
    project ($mvo $mvo  $vo) (sphere)
    project ( $vo $mvo  $vo) (sphere)
    project ( $vo  $vo  $vo) (sphere)
    project ($mvo  $vo  $vo) (sphere)
);

blocks
(
    hex (0 1 2 3 4 5 6 7) ($nx $ny $nz) grading (1 1 1)  // Inner block

    // Outer blocks
    hex ( 8  0  3 11 12  4  7 15) ($nr $ny $nz) grading (1 1 1)  // x-min
    hex ( 1  9 10  2  5 13 14  6) ($nr $ny $nz) grading (1 1 1)  // x-max
    hex ( 8  9  1  0 12 13  5  4) ($nx $nr $nz) grading (1 1 1)  // y-min
    hex ( 3  2 10 11  7  6 14 15) ($nx $nr $nz) grading (1 1 1)  // y-max
    hex ( 8  9 10 11  0  1  2  3) ($nx $ny $nr) grading (1 1 1)  // z-min
    hex ( 4  5  6  7 12 13 14 15) ($nx $ny $nr) grading (1 1 1)  // z-max
);

edges
(
    // Outer blocks
    project  8  9 (sphere)
    project 10 11 (sphere)
    project 14 15 (sphere)
    project 12 13 (sphere)

    project  8 11 (sphere)
    project  9 10 (sphere)
    project 13 14 (sphere)
    project 12 15 (sphere)

    project  8 12 (sphere)
    project  9 13 (sphere)
    project 10 14 (sphere)
    project 11 15 (sphere)

    // Inner block
    project 0 1 (innerSphere)
    project 2 3 (innerSphere)
    project 6 7 (innerSphere)
    project 4 5 (innerSphere)

    project 0 3 (innerSphere)
    project 1 2 (innerSphere)
    project 5 6 (innerSphere)
    project 4 7 (innerSphere)

    project 0 4 (innerSphere)
    project 1 5 (innerSphere)
    project 2 6 (innerSphere)
    project 3 7 (innerSphere)
);

faces
(
    // Outer blocks
    project ( 8 12 15 11) sphere  // x-min
    project ( 9 10 14 13) sphere  // x-max
    project ( 8  9 13 12) sphere  // y-min
    project (11 15 14 10) sphere  // y-max
    project ( 8 11 10  9) sphere  // z-min
    project (12 13 14 15) sphere  // z-max
);

boundary
(
    walls
    {
        type wall;
        faces
        (
            ( 8 12 15 11)  // x-min
            ( 9 10 14 13)  // x-max
            ( 8  9 13 12)  // y-min
            (11 15 14 10)  // y-max
            ( 8 11 10  9)  // z-min
            (12 13 14 15)  // z-max
        );
    }
);

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