//process this file using: m4 -P blockMeshDict.m4 > blockMeshDict

//m4 definitions -----------------------------
m4_changecom(//)m4_changequote([,])
m4_define(calc, [m4_esyscmd(perl -e 'printf ($1)')])
m4_define(pi, 3.14159265358979323844)
m4_define(rad, [calc($1*pi/180.0)])
m4_define(VCOUNT, 0)
m4_define(vlabel, [[// ]Vertex $1 = VCOUNT m4_define($1, VCOUNT)m4_define([VCOUNT], m4_incr(VCOUNT))])

//Geometry -----------------------------------
// 2 planes levels
m4_define(zA, 0.0)
m4_define(zB, 0.1)

// Angle span for inner block
m4_define(angleB, rad(  60.0))
m4_define(angleD, rad( 150.0))

// Angle span for outer block
m4_define(angleA, rad( 5.0))
m4_define(angleC, rad(41.0))

// Radial dimensions
m4_define(r1, 1.0)
m4_define(r2, 2.0)
m4_define(r3, 3.0)

// Mesh parameters
m4_define(nCells, 5)
m4_define(BLOCKSIZE_UPSTREAM,   25 17 1)
m4_define(BLOCKSIZE_DOWNSTREAM, 25 27 1)
m4_define(grading, 1.0)

FoamFile
{
    version         2.0;    format          ascii;

    root            "";
    case            "";
    instance        "";
    local           "";

    class           dictionary;
    object          blockMeshDict;
}

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

convertToMeters 1;

vertices
(
//Plane A: 
//Bottom of curved block
(calc(r1*cos(angleB)) calc(r1*sin(angleB)) zA) vlabel(A0)
(calc(r2*cos(angleB)) calc(r2*sin(angleB)) zA) vlabel(A1)
(calc(r1*cos(angleD)) calc(r1*sin(angleD)) zA) vlabel(A2)
(calc(r2*cos(angleD)) calc(r2*sin(angleD)) zA) vlabel(A3)

//Plane B:
//Top of curved block
(calc(r1*cos(angleB)) calc(r1*sin(angleB)) zB) vlabel(B0)
(calc(r2*cos(angleB)) calc(r2*sin(angleB)) zB) vlabel(B1)
(calc(r1*cos(angleD)) calc(r1*sin(angleD)) zB) vlabel(B2)
(calc(r2*cos(angleD)) calc(r2*sin(angleD)) zB) vlabel(B3)

//Plane A: Bottom of straight block
(calc(r2*cos(angleA)) calc(r2*sin(angleA)) zA) vlabel(B4)
(calc(r3*cos(angleA)) calc(r3*sin(angleA)) zA) vlabel(B5)
(calc(r2*cos(angleC)) calc(r2*sin(angleC)) zA) vlabel(B6)
(calc(r3*cos(angleC)) calc(r3*sin(angleC)) zA) vlabel(B7)

//Plane B: Top of straight block
(calc(r2*cos(angleA)) calc(r2*sin(angleA)) zB) vlabel(C0)
(calc(r3*cos(angleA)) calc(r3*sin(angleA)) zB) vlabel(C1)
(calc(r2*cos(angleC)) calc(r2*sin(angleC)) zB) vlabel(C2)
(calc(r3*cos(angleC)) calc(r3*sin(angleC)) zB) vlabel(C3)

);

blocks          
(
    hex ( A0 A1 A3 A2 B0 B1 B3 B2 ) (BLOCKSIZE_UPSTREAM)   simpleGrading (1 1 grading)
    hex ( B4 B5 B7 B6 C0 C1 C3 C2 ) (BLOCKSIZE_DOWNSTREAM) simpleGrading (1 1 grading)
);

edges           
(
    // --- PLANE A: Bottom of curved block
    arc  A0 A2  (calc(r1*cos((angleB+angleD)/2)) calc(r1*sin((angleB+angleD)/2)) zA)
    arc  A1 A3  (calc(r2*cos((angleB+angleD)/2)) calc(r2*sin((angleB+angleD)/2)) zA)

    // --- PLANE B: Top of curved block
    arc  B0 B2  (calc(r1*cos((angleB+angleD)/2)) calc(r1*sin((angleB+angleD)/2))  zB)
    arc  B1 B3  (calc(r2*cos((angleB+angleD)/2)) calc(r2*sin((angleB+angleD)/2)) zB)

    // --- PLANE A: Bottom of straight block
    arc  B4 B6  (calc(r2*cos((angleA+angleC)/2)) calc(r2*sin((angleA+angleC)/2)) zA)
    arc  B5 B7  (calc(r3*cos((angleA+angleC)/2)) calc(r3*sin((angleA+angleC)/2)) zA)

    // --- PLANE B: Top of straight block
    arc  C0 C2  (calc(r2*cos((angleA+angleC)/2)) calc(r2*sin((angleA+angleC)/2)) zB)
    arc  C1 C3  (calc(r3*cos((angleA+angleC)/2)) calc(r3*sin((angleA+angleC)/2)) zB)
);

patches         
(
    patch outflow
    (
	( B5 B7 C3 C1 )
    )
    patch inflow
    (
        ( A0 B0 B2 A2 )
    )


    cyclicGgi upstreamPerio1
    (
        (B4 B5 C1 C0)
    )

    cyclicGgi upstreamPerio2
    (
        (B6 C2 C3 B7)
    )

    mixingPlane upstreamMixingPlanePatch
    (
	( B4 C0 C2 B6 )  
    )

    mixingPlane downstreamMixingPlanePatch
    (
        ( A1 A3 B3 B1 )
    )


    symmetryPlane downstreamWall
    (
	( A0 A2 A3 A1 )
        ( B0 B1 B3 B2 )
    )

    symmetryPlane upstreamWall
    (
	( C1 C3 C2 C0)   
       (B4 B6 B7 B5)
    )

    cyclicGgi downstreamPerio1
    (
        (A0 A1 B1 B0)
    )

    cyclicGgi downstreamPerio2
    (
	(A2 B2 B3 A3)
    )

);

mergePatchPairs
(
);