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Help with cyclic boundary condition needed

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Old   May 30, 2021, 10:18
Default Help with cyclic boundary condition needed
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Claudia
Join Date: Mar 2021
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Hey guys!


as you can see in the attached snapshots, i have have a tray filled with Schokolate inside a windtunnel. In the real windtunnel, there are 3 of these trays on top of each other. So basically where the upper and lower wall is, would actually start another tray.

I want to use the cyclic boundary condition, but i have some problems with it. I tried changing the boundary file but I am confused about some entries, for example the "separation vektor" and the "matchTolerance" one.



My boundaryFile looks like this:

Code:
7
(
    inlet
    {
        type            patch;
        nFaces          1350;
        startFace       2606557;
    }
    outlet
    {
        type            patch;
        nFaces          1350;
        startFace       2607907;
    }
    walls
    {
        type            wall;
        inGroups        List<word> 1(wall);
        nFaces          23802;
        startFace       2609257;
    }
    upperWall
    {
        type            cyclic;
        inGroups        List<word> 1(cyclic);
        nFaces          9000;
        startFace       2633059; 

        matchTolerance 0.001;   //?
        transform translational;
        neighbourPatch lowerForm;
       separationVector (0 0 0);     //?

    }
    wallsForm
    {
        type            wall;
        inGroups        List<word> 1(wall);
        nFaces          53516;
        startFace       2642059;
    }
    lowerForm
    {
        type              cyclic;
        inGroups        List<word> 1(cyclic);
        nFaces          60900;
        startFace       2695575;
        matchTolerance 0.001;
        transform translational;
        neighbourPatch upperWall;
        separationVector (0 0 0);
    }
    Schokolade
    {
        type            wall;
        inGroups        List<word> 1(wall);
        nFaces          38520;
        startFace       2756475;
    }
)
Does someone have an idea how to use the cyclic BC in my case?
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boundary condition, cyclic, cyclic bc

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