[Pedro Felix]

Hello guys!!

I'm trying to leave my simulation with the following boundary condition: The fluid that enters the upper part must come out at the bottom, and the fluid that enters the lower part must come out at the top. My simulation is a channel with cylinders inside, as in the attached image.

How do I do that?

My boundary file looks like this and I was wondering if it is correct::

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v1912                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       polyBoundaryMesh;
    location    "0.5/polyMesh";
    object      boundary;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

6
(
    inlet
    {
        type            patch;
        nFaces          34;
        startFace       14819;
    }
    frontandback
    {
        type            empty;
        inGroups        1(empty);
        nFaces          2880;
        startFace       14853;
    }
    cylinders
    {
        type            patch;
        nFaces          1398;
        startFace       17733;
    }
    outlet
    {
        type            patch;
        nFaces          34;
        startFace       19131;
    }
    new_top
    {
        type            cyclicAMI;
        inGroups        1(cyclicAMI);
        nFaces          176;
        startFace       19165;
        matchTolerance  0.1;
        transform       translational;
        neighbourPatch  new_bottom;
        separationVector (0 -5 0);
    }
    new_bottom
    {
        type            cyclicAMI;
        inGroups        1(cyclicAMI);
        nFaces          176;
        startFace       19341;
        matchTolerance  0.1;
        transform       translational;
        neighbourPatch  new_top;
        separationVector (0 5 0);
    }
)

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

Sorry for the mistakes I'm not a native English speaker.