[lsingh]

Hi all!

I'm new to OpenFOAM and have been trying to build my first test case. The geometry consists of a cylindrical inlet which opens into a larger cylindrical volume, which opens out to an even larger cylindrical volume. All three cylinders share the same major axis. Each cylinder makes up one block. I have been having problems with my blockMeshDict file when I define the walls of the larger cylinders which surround the inlet from the smaller cylinders. I have tried using MergePatchPairs to match things up with no success either. I have included my blockMeshDict file below. How should I be describing the back walls of the cylinders and the interface between each block?

Thank you all for your help!

FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters .01;

vertices
(
    /*Cylinder 1 - Inlet*/
	(-1 -.15875 0)//0
	(0 -.15875 0)//1
	(0 .15875 0)//2
	(-1 .15875 0)//3
	(-1 0 .15875)//4
	(0 0 .15875)//5
	(0 0 -.15875)//6
	(-1 0 -.15875)//7
	
	/*Cylinder 2 - Helicon*/
	(0 -6.65 0)//8
	(29.2 -6.65 0)//9
	(29.2 6.65 0)//10
	(0 6.65 0)//11
	(0 0 6.65)//12
	(29.2 0 6.65)//13
	(29.2 0 -6.65)//14
	(0 0 -6.65)//15
	
	/*Cylinder 3 - Vacuum*/
	(29.2 -20 0)//16
	(100 -20 0)//17
	(100 20 0)//18
	(29.2 20 0)//19
	(29.2 0 20)//20
	(100 0 20)//21
	(100 0 -20)//22
	(29.2 0 -20)//23
	

);

blocks
(
    hex (0 1 6 7 4 5 2 3) (100 10 10) simpleGrading (1 1 1)//Inlet
    hex (8 9 14 15 12 13 10 11) (150 67 67) simpleGrading (5 1 1)//Helicon
	hex (16 17 22 23 20 21 18 19) (70 40 40) simpleGrading (1 1 1)//Vacuum
);

edges
(
	/*Inlet*/
	arc 0 4 (-1 -.112253202 .112253202)
	arc 3 4 (-1 .112253202 .112253202)
	arc 3 7 (-1 .112253202 -.112253202)
	arc 0 7 (-1 -.112253202 -.112253202)
	arc 1 5 (0 -.112253202 .112253202)
	arc 2 5 (0 .112253202 .112253202)
	arc 2 6 (0 .112253202 -.112253202)
	arc 1 6 (0 -.112253202 -.112253202)
	
	/*Helicon*/
	arc 8 12 (0 -4.70226009 4.70226009)
	arc 11 12 (0 4.70226009 4.70226009)
	arc 11 15 (0 4.70226009 -4.70226009)
	arc 8 15 (0 -4.70226009 -4.70226009)
	arc 9 13 (29.2 -4.70226009 4.70226009)
	arc 10 13 (29.2 4.70226009 4.70226009)
	arc 10 14 (29.2 4.70226009 -4.70226009)
	arc 9 14 (29.2 -4.70226009 -4.70226009)
	
	/*Vacuum*/
	arc 16 20 (29.2 -14.1421356 14.1421356)
	arc 19 20 (29.2 14.1421356 14.1421356)
	arc 19 23 (29.2 14.1421356 -14.1421356)
	arc 16 23 (29.2 -14.1421356 -14.1421356)
	arc 17 21 (100 -14.1421356 14.1421356)
	arc 18 21 (100 14.1421356 14.1421356)
	arc 18 22 (100 14.1421356 -14.1421356)
	arc 17 22 (100 -14.1421356 -14.1421356)

);

patches
(
    patch inlet
    (
        (0 4 3 7)
    )
    wall walls
    (
        /*Cylinder 1 Side Walls*/
		(5 4 0 1)
		(2 3 4 5)
		(3 2 6 7)
		(7 6 1 0)
		
		/*Cylinder 2 Side Walls*/
		(13 12 8 9)
		(10 11 12 13)
		(11 10 14 15)
		(15 14 9 8)
		
		/*Cylinder 2 Back Wall*/
		(11 2 5 12)
		(11 15 6 2)
		(6 15 8 1)
		(12 5 1 8)
		
		/*Cylinder 3 Back Wall*/
		(19 10 13 20)
		(19 23 14 10)
		(14 23 16 9)
		(20 13 9 16)
		
    )
    patch outlet
    (
        
		(18 21 17 22)
		(21 20 16 17)
		(18 19 20 21)
		(19 18 22 23)
		(23 22 17 16)
		
    )
	/*
	patch interface1
    (
        
		(2 5 1 6)
		
    )
	
	patch interface2
    (
        
		(11 15 8 12)
		
    )
	
	patch interface3
    (
        
		(9 14 10 13)
		
    )
	
	patch interface4
    (
        
		(19 23 16 20)
		
    )
	*/
);

mergePatchPairs
(
	/*(interface1 interface2)
	(interface3 interface4)*/
	
	
);