CFD Online Discussion Forums - [blockMesh] defining and connecting two circular pipes using blockMesh

You can make this with a block and some edges.
Here are two examples I just made. You can copy it and adapt to your needs:

Code:

/*--------------------------------*- C++ -*----------------------------------*\

| ========= | |

| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |

| \\ / O peration | Version: 2.2.0 |

| \\ / A nd | Web: www.OpenFOAM.org |

| \\/ M anipulation | |

\*---------------------------------------------------------------------------*/

FoamFile

{

version 2.0;

format ascii;

class dictionary;

object blockMeshDict;

}

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



convertToMeters 1;



vertices

(

(0 1.292893219 0.707106781)//0

(0 2.707106781 0.707106781)//1

(0 2.707106781 -0.707106781)//2

(0 1.292893219 -0.707106781)//3

(2.707106781 0 0.707106781)//4

(1.292893219 0 0.707106781)//5

(1.292893219 0 -0.707106781)//6

(2.707106781 0 -0.707106781)//7

);



blocks

(

hex (5 4 7 6 0 1 2 3) (50 50 50) simpleGrading (1 1 1)

);



edges

(

arc 0 1 (0 2 1)

arc 1 2 (0 3 0)

arc 2 3 (0 2 -1)

arc 3 0 (0 1 0)



arc 4 5 (2 0 1)

arc 5 6 (1 0 0)

arc 6 7 (2 0 -1)

arc 7 4 (3 0 0)



arc 0 5 (0.914213563 0.914213563 0.707106781)

arc 3 6 (0.914213563 0.914213563 -0.707106781)

arc 1 4 (1.914213562 1.914213562 0.707106781)

arc 2 7 (1.914213562 1.914213562 -0.707106781)

);



boundary

(



);



mergePatchPairs

(

);



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

Code:

/*--------------------------------*- C++ -*----------------------------------*\

| ========= | |

| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |

| \\ / O peration | Version: 2.2.0 |

| \\ / A nd | Web: www.OpenFOAM.org |

| \\/ M anipulation | |

\*---------------------------------------------------------------------------*/

FoamFile

{

version 2.0;

format ascii;

class dictionary;

object blockMeshDict;

}

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



convertToMeters 1;



vertices

(

(0 1 0)//0

(0 2 1)//1

(0 3 0)//2

(0 2 -1)//3

(3 0 0)//4

(2 0 1)//5

(1 0 0)//6

(2 0 -1)//7

);



blocks

(

hex (5 4 7 6 1 2 3 0) (50 50 50) simpleGrading (1 1 1)

);



edges

(

arc 0 1 (0 1.292893219 0.707106781)

arc 1 2 (0 2.707106781 0.707106781)

arc 2 3 (0 2.707106781 -0.707106781)

arc 3 0 (0 1.292893219 -0.707106781)



arc 4 5 (2.707106781 0 0.707106781)

arc 5 6 (1.292893219 0 0.707106781)

arc 6 7 (1.292893219 0 -0.707106781)

arc 7 4 (2.707106781 0 -0.707106781)



arc 0 6 (0.707106781 0.707106781 0)

arc 1 5 (1.414213562 1.414213562 1)

arc 2 4 (2.121320344 2.121320344 0)

arc 3 7 (1.414213562 1.414213562 -1)

);



boundary

(



);



mergePatchPairs

(

);



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

Theses two edge pipe are are quite similar, but depending of how you made the pipes you want to connect, you may prefer one way to the other.

Theses case are quite general with pipes of radius 1 and small curve radius to 1 too (you may need to not have this curve).