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Periodic Boundary Condition For The Edges of Parallelogram

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Old   May 18, 2020, 03:19
Default Periodic Boundary Condition For The Edges of Parallelogram
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Duc Anh
Join Date: Dec 2018
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hi foamer,
I want to define 4 cyclics boundary for 4 edges of the parallelog channel. But I have a problem with 2 edges which were tilted against the axis (look at the picture below).
I was used gmsh to meshing and used createPatchDict to create cyclic boundary.
Code:
/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  6
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      createPatchDict;
}

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

// Do a synchronisation of coupled points after creation of any patches.
// Note: this does not work with points that are on multiple coupled patches
//       with transformations (i.e. cyclics).
pointSync false;

// Optional: Write cyclic matches into .obj format; defaults to false.
writeCyclicMatch  false;

// Patches to create.
patches
(
    {
        //- Master side patch
        name            in_1;
        patchInfo
        {
            type            cyclic;
            matchTolerance  0.0001;
            neighbourPatch  out_1;
            transform       translational;
	   	    separationVector  (8e-6 0 0) ;
        }
        constructFrom patches;
        patches (in1);
    }

    {
        //- Slave side patch
        name            out_1;
        patchInfo
        {
            type            cyclic;
            matchTolerance  0.0001;
            neighbourPatch  in_1;
            transform       translational;
			separationVector  (-8e-6 0 0);
        }
        constructFrom patches;
        patches (out1);
    }

    {
        //- Master side patch
        name            in_2;
        patchInfo
        {
            type            cyclic;
           // inGroups        1(cyclicAMI);
            matchTolerance  0.0001;
            neighbourPatch  out_2;
            transform       translational;
			separationVector  (0 -8e-6 0 ) ;       
		}
        constructFrom patches;
        patches (in2);
    }

    {
        //- Slave side patch
        name            out_2;
        patchInfo
        {
            type            cyclic;
           // inGroups        1(cyclicAMI);
            matchTolerance  0.0001;
            neighbourPatch  in_2;
            transform       translational;
			separationVector  (0 8e-6 0 );
        }
        constructFrom patches;
        patches (out2);
    }
);
I face a problem :"face 0 area does not match neighbour by 22.2222% -- possible face ordering problem.
patch:in_2 my area:1e-13 neighbour area:8e-14 matching tolerance:0.0001
"
I was tried cyclicAMI but it is not fit in my solver which I was developed.
Any one help me to create cyclic boundary for these edge.
Thank you so much,
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cyclic boundary condition, gmsh 4.0.4

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