convertToMeters 0.01;

vertices
(
	(-8 -6 0)
	(8 -6 0)
	(8 6 0)
	(-8 6 0)
	(-1 -4 0)
	(1 -4 0)
	(1 4 0)
	(-1 4 0)
	
	(-8 -6 0.1)
	(8 -6 0.1)
	(8 6 0.1)
	(-8 6 0.1)
	(-1 -4 0.1)
	(1 -4 0.1)
	(1 4 0.1)
	(-1 4 0.1)
);

edges
(
	arc 0 1 (0 -10 0)
	arc 1 2 (10 0 0)
	arc 2 3 (0 10 0)
	arc 3 0 (-10 0 0)
	arc 8 9 (0 -10 0.1)
	arc 9 10 (10 0 0.1)
	arc 10 11 (0 10 0.1)
	arc 11 8 (-10 0 0.1)

	arc 4 5 (0 -4.123 0)
	arc 6 7 (0 4.123 0)

	arc 12 13 (0 -4.123 0.1)
	arc 14 15 (0 4.123 0.1)
);

blocks
(
	hex (0 1 5 4 8 9 13 12) (20 30 1) simpleGrading (1 0.5 1)
	hex (1 2 6 5 9 10 14 13) (20 30 1) simpleGrading (1 0.5 1)
	hex (2 3 7 6 10 11 15 14) (20 30 1) simpleGrading (1 0.5 1)
	hex (3 0 4 7 11 8 12 15) (20 30 1) simpleGrading (1 0.5 1)
);

boundary
(
	mixer
	{
	type wall;
	faces 
	(
		(4 5 13 12)
		(5 6 14 13)
		(6 7 15 14)
		(7 4 12 15)
	);
	}

	frontAndBack
	{
	type empty;
	faces
	(
		(0 1 5 4) 
		(1 2 6 5) 
		(2 3 7 6)
		(3 0 4 7)

		(8 9 13 12) 
		(9 10 14 13) 
		(10 11 15 14)
		(11 8 12 15)
	);
	}

	AMIInside
	{
	type patch;
	faces
	(
		(0 1 9 8)
		(1 2 10 9)
		(2 3 11 10)
		(3 0 8 11)
	);
	}
);