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values take by probes function object

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Old   July 7, 2014, 12:06
Default values take by probes function object
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Alex
Join Date: Oct 2013
Posts: 337
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zfaraday will become famous soon enough
Dear Foamers,

I'm working in a conjugate heat transfer problem where I need to probe the values of T in the interfase between a solid and a fluid regions. In order to do that I set up probes in the controlDict-file as follows:
Code:
functions
{
    probes_object
    {
        type            probes; //patchProbes;//
        functionObjectLibs ("libsampling.so");
        region          object;
        outputControl   timeStep;
        outputInterval  100;
        probeLocations //patchName //
        (                     //points at boundary
            (0    0.1   0  )    //bottom
            (0    0.1  0.3 )    //top
            (-0.2 0.1  0.1 )    //left
            (0.2  0.1  0.1 )    //right
            (0    -0.1 0.1 )    //front
            (0    0.2  0.1 )    //back
            (0    0.1  0.15)  //inner point in object
            (0    0.48 0.1 )  //point behind object
            (0    0.25 0.4 )  //point above object
        );
        fields
        (
            T
        );
    }

    probes_air
    {
        type            probes; //patchProbes;//
        functionObjectLibs ("libsampling.so");
        region          air;
        outputControl   timeStep;
        outputInterval  100;
        probeLocations //patchName //
        (                     //points at boundary
            (0    0.1   0  )    //bottom
            (0    0.1  0.3 )    //top
            (-0.2 0.1  0.1 )    //left
            (0.2  0.1  0.1 )    //right
            (0    -0.1 0.1 )    //front
            (0    0.2  0.1 )    //back
            (0    0.1  0.15)  //inner point in object
            (0    0.48 0.1 )  //point behind object
            (0    0.25 0.4 )  //point above object
        );
        fields
        (
            T
        );
    }
}
As you can see I am probing the same point twice, once from the fluid region and once from the solid region. At this stage, a doubt came out to my mind. Where are these values taken from? All the probed points belong to the boundaries so I guess the value retrieved for one of these points is the value of T at the boundary face of the cell that contains that point. However, I don't know if the whole boundary face of a single cell has the same value of T or if only the the value at the center is calculated and then the value for the rest of the points is interpolated.

Morevoer, what if the point was inside a cell but it was not the center? I guess it is interpolated, right?

Regards,


Alex
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