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strange behavior of BC mappedValue

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Old   April 19, 2024, 02:46
Unhappy strange behavior of BC mappedValue
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Sebastian Thaler
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Hey,

i am trying to connect two patches with the mapped condition. I am testing the BC on a simple rectangular duct with laminar flow. I am trying to connect the upper and lower side. It works fine with cyclic, but this condition does not work on my actual model. So i am trying the mapped type.
Here the BC part of blockMesh:
Code:
boundary                                                                          
(
    yMax
    {
        type mapped;
        neighbourPatch yMin;
        //matchTolerance 0.1;
        transformType translational;
        separation      (0 0.05 0);
        faces ((3 7 6 2));
    }
    yMin
    {
        type mapped;
        neighbourPatch yMax;
        //matchTolerance 0.1;
        transformType translational;
        separation      (0 -0.05 0);
        faces ((1 5 4 0));
    }
    xMax
    {
        type wall;
        faces ((2 6 5 1));
    }
    xMin
    {
        type wall;
        faces ((0 4 7 3));
    }                
    inlet
    {
        type patch;
        faces
        (
            (0 3 2 1)
        );
        
    }                
    outlet
    {
        type patch;
        faces
        (
            (4 5 6 7)
        );
        
    }                                      
);
and here my 0/U file:
Code:
dimensions      [0 1 -1 0 0 0 0];

internalField   uniform (0 0 0);

boundaryField
{
    inlet
    {
        type                flowRateInletVelocity; 
        meanVelocity        5; 
        profile             laminarBL; 
        //type fixedValue;
        value               uniform (0 0 5);
    }

    outlet
    {
        type            zeroGradient;
    }

    ".*"
    {
        type            noSlip;                           
    }

    yMin
    {
        type mappedValue;
        value uniform (0 0 0);
    }

    yMax
    {
        type mappedValue;
        value uniform (0 0 0);
    }
     #includeEtc "caseDicts/setConstraintTypes"
}
Strangely the behavior of this setup is dependent on the value entry of my mappedValue-patches. The flow takes the given value on this patch for all time-steps. Does someone know this problem and maybe a solution?
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