[Claire88]

Hello everyone,

I have a case where I have generated a mesh in ANSYS and used fluent3DMeshToFoam to convert to OpenFoam format. The mesh was generated from a complex burner geometry with several internal contact regions. The part is not rotating and one of the contact regions has two neighboring patches. I added an additional bc for contact_region_2-contact_region_3-src to account for both neighboring patches.

boundary file:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  5.x                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       polyBoundaryMesh;
    location    "constant/polyMesh";
    object      boundary;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

13
(
    wall-fff-3-volume_volume
    {
        type            wall;
        inGroups        1(wall);
        nFaces          68602;
        startFace       7029853;
    }
    wall-fff-3-volume
    {
        type            wall;
        inGroups        1(wall);
        nFaces          903;
        startFace       7098455;
    }
    inlet_outertube
    {
        type            patch;
        nFaces          288;
        startFace       7099358;
    }
    inlet_innertube
    {
        type            patch;
        nFaces          705;
        startFace       7099646;
    }
    inlet_coflow
    {
        type            patch;
        nFaces          892;
        startFace       7100351;
    }
    outlet_chamber
    {
        type            patch;
        nFaces          3741;
        startFace       7101243;
    }
    wall
    {
        type            wall;
        inGroups        1(wall);
        nFaces          992;
        startFace       7104984;
    }
    contact_region_2-contact_region_3-src
    {
        type            cyclicAMI;
        nFaces          65110;
        startFace       7105976;
        neighbourPatch    contact_region_2-contact_region_3-trg-fff-3-volume_volume1;
        transform    noOrdering;
        matchTolerance  0.1;
    }
    contact_region_2-contact_region_3-src2
    {
        type            cyclicAMI;
        nFaces          65110;
        startFace       7105976;
        neighbourPatch    contact_region_2-contact_region_3-trg-fff-3-volume_volume;
        transform    noOrdering;
        matchTolerance  0.1;
    }
    contact_region_2-contact_region_3-trg-fff-3-volume_volume1
    {
        type            cyclicAMI;
        nFaces          1248;
        startFace       7171086;
        neighbourPatch    contact_region_2-contact_region_3-src;
        transform    noOrdering;
        matchTolerance  0.1;
    }
    contact_region_2-contact_region_3-trg-fff-3-volume_volume
    {
        type            cyclicAMI;
        nFaces          400;
        startFace       7172334;
        neighbourPatch    contact_region_2-contact_region_3-src2;
        transform    noOrdering;
        matchTolerance  0.1;
    }
    contact_region_4-src
    {
        type            cyclicAMI;
        nFaces          47772;
        startFace       7172734;
        neighbourPatch    contact_region_4-trg;
        transform    noOrdering;
        matchTolerance  0.1;
    }
    contact_region_4-trg
    {
        type            cyclicAMI;
        nFaces          59160;
        startFace       7220506;
        neighbourPatch    contact_region_4-src;
        transform    noOrdering;
        matchTolerance  0.1;
    }
)

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

p file:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  5.0                                   |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    location    "0.3";
    object      p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [1 -1 -2 0 0 0 0];

internalField   uniform 101325;

boundaryField
{
    outlet_chamber
    {
        type            fixedValue;
    value        uniform 101325;
    }
    inlet_outertube
    {
        type            zeroGradient;
    }
    inlet_innertube
    {
        type            zeroGradient;
    }
    inlet_coflow
    {
        type            zeroGradient;
    }
    wall-fff-3-volume_volume
    {
        type            zeroGradient;
    }
    wall-fff-3-volume
    {
        type            zeroGradient;
    }
    wall
    {
        type            zeroGradient;
    }
    contact_region_2-contact_region_3-src
    {
        type        cyclicAMI;
    }
    contact_region_2-contact_region_3-src2
    {
        type            cyclicAMI;
    }
    contact_region_2-contact_region_3-trg-fff-3-volume_volume1
    {
        type        cyclicAMI;
    }
    contact_region_2-contact_region_3-trg-fff-3-volume_volume
    {
        type        cyclicAMI;
    }
    contact_region_4-src
    {
        type        cyclicAMI;
    }
    contact_region_4-trg
    {
        type        cyclicAMI;
    }
}


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

When I try to view my mesh in paraFoam i get the following error:

AMI: Creating addressing and weights between 65110 source faces and 1248 target faces
--> FOAM Warning : 
    From function void Foam::AMIMethod<SourcePatch, TargetPatch>::checkPatches() const [with SourcePatch = Foam::PrimitivePatch<Foam::face, Foam::SubList, const Foam::Field<Foam::Vector<double> >&>; TargetPatch = Foam::PrimitivePatch<Foam::face, Foam::SubList, const Foam::Field<Foam::Vector<double> >&>]
    in file lnInclude/AMIMethod.C at line 57
    Source and target patch bounding boxes are not similar
    source box span     : (0.0348 0.0348 0.301)
    target box span     : (0.0381 0.0380692 0.263007)
    source box          : (-0.0174 -0.0174 0.358533) (0.0174 0.0174 0.659533)
    target box          : (-0.01905 -0.0190346 0.396525) (0.01905 0.0190347 0.659533)
    inflated target box : (-0.0324733 -0.0324578 0.383102) (0.0324733 0.0324579 0.672956)


--> FOAM FATAL ERROR: 
Unable to set source and target faces

I am a beginner in setting up boundary conditions but I understood that the cyclicAMI bc could be used to map neighboring patches that may not be perfectly matched. Is this correct? I looked at some other forum threads with a similar problem which was why I added transform and matchTolerance but I am still seeing the same errors as before.


Am I approaching this problem correctly? Is there something I can do match the source and targets?


Thanks,
Charmaine