/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v1806                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

verbose no;

geometry
{
    sphere
    {
        type   sphere;
        origin (0 0 0);
        radius 1;
    }

    innerSphere
    {
        type   sphere;
        origin (0 0 0);
        radius 0.5;
    }
}

scale 1;

n    10;

// Rough approximation of corner points
v    0.5773502;
mv  -0.5773502;
vh   0.2886751;
mvh -0.2886751;

vertices
(
    // Inner block points
    project ($mvh $mvh $mvh) (innerSphere)
    project ( $vh $mvh $mvh) (innerSphere)
    project ( $vh  $vh $mvh) (innerSphere)
    project ($mvh  $vh $mvh) (innerSphere)
    project ($mvh $mvh  $vh) (innerSphere)
    project ( $vh $mvh  $vh) (innerSphere)
    project ( $vh  $vh  $vh) (innerSphere)
    project ($mvh  $vh  $vh) (innerSphere)

    // Outer block points
    project ($mv $mv $mv) (sphere)
    project ( $v $mv $mv) (sphere)
    project ( $v  $v $mv) (sphere)
    project ($mv  $v $mv) (sphere)
    project ($mv $mv  $v) (sphere)
    project ( $v $mv  $v) (sphere)
    project ( $v  $v  $v) (sphere)
    project ($mv  $v  $v) (sphere)
);

blocks
(
    hex ( 0  1  2  3  4  5  6  7) ($n $n $n) simpleGrading (1 1 1)
    hex ( 9  8 12 13  1  0  4  5) ($n $n $n) simpleGrading (1 1 1)
    hex (10  9 13 14  2  1  5  6) ($n $n $n) simpleGrading (1 1 1)
    hex (11 10 14 15  3  2  6  7) ($n $n $n) simpleGrading (1 1 1)
    hex ( 8 11 15 12  0  3  7  4) ($n $n $n) simpleGrading (1 1 1)
    hex ( 8  9 10 11  0  1  2  3) ($n $n $n) simpleGrading (1 1 1)
    hex (13 12 15 14  5  4  7  6) ($n $n $n) simpleGrading (1 1 1)
);

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

boundary
(
    walls
    {
        type wall;
        faces
        (
            ( 8 12 15 11)
            (10 14 13  9)
            ( 9 13 12  8)
            (11 15 14 10)
            ( 8 11 10  9)
            (12 13 14 15)
        );
    }
);

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