openfoam/tutorials/compressible/rhoSimpleFoam/squareBend/system/sampling

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2206                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      sampling;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

// Setup for surfaceFieldValue
//
//   restartTime:
//     - a 'one-shot' reset at a particular time
//
// fields [required]
//     Pairs of fields to use for calculating the deviation.
//     The fields must already exist on the surfaces.
//
// weightField [optional]
//     A scalar or vector field for weighting.
//
// postOperation [optional]
//     Modify the results by particular operations.
//     (none | sqrt)
//     The sqrt operation is useful when determining RMS values.
//
// The 'output/write' control triggers the calculation.
__surfaceFieldValue
{
    type            surfaceFieldValue;
    libs            (fieldFunctionObjects);
    log             on;
    enabled         true;

    writeControl    timeStep;
    writeInterval   1;

    writeFields     false;
    surfaceFormat   vtk;
    // writeArea       true;

    // resetOnStartUp  true;
    // resetOnOutput   false;
    // periodicRestart true;
    // restartPeriod   0.0005;
}


// * * * * * * * * * * * * * * * * Sampling  * * * * * * * * * * * * * * * * //

// Sample volume fields to surfaces and hold on registry.
sampled
{
    type    surfaces;
    libs    (sampling);
    log     true;

    executeControl  timeStep;
    executeInterval 1;
    writeControl    none;
    sampleOnExecute true;

    surfaceFormat   none;

    fields      (p rho U T rhoU pTotal pTot);

    // Remove derived fields we created prior
    removeFieldsOnExecute   (rhoU pTotal);

    _plane
    {
        type    plane;
        source  cells;
        store   true;

        point   (-0.04 0 0);
        normal  (-1 0 0);
    }

    surfaces
    {
        // Top channel
        plane1
        {
            ${_plane}
            bounds (-1 0 -1) (0 1 1);
        }

        // Bottom channel
        plane2
        {
            ${_plane}
            bounds (-1 -1 -1) (0 0 1);
        }

        // Angled plane - for general testing
        plane3
        {
            type        distanceSurface;
            distance    0;
            signed      true;
            store       true;

            surfaceType triSurfaceMesh;
            surfaceName angledPlane.obj;
        }
    }
}


// Sample and write for meshed surfaces
sampleMesh
{
    type    surfaces;
    libs    (sampling);
    log     true;

    writeControl    writeTime;
    writeInterval   1;

    surfaceFormat   vtk;

    fields      (p rho U T);

    surfaces
    {
        // Oversized sampling - for general testing
        meshed_sample
        {
            type        meshedSurface;
            surface     oversized_sample.obj;
            source      cells;
            maxDistance 0.0025;
            defaultValue
            {
                T     273;
            }
        }

        meshed_interpolate
        {
            $meshed_sample;
            interpolate true;
        }
    }
}


// * * * * * * * * * * * * * * * Calculations  * * * * * * * * * * * * * * * //

massflow
{
    ${__surfaceFieldValue}

    regionType      functionObjectSurface;
    name            sampled.plane1;

    operation       areaNormalIntegrate;

    fields          ( rhoU );
}

areaAverage
{
    ${__surfaceFieldValue}

    regionType      functionObjectSurface;
    name            sampled.plane1;

    operation       weightedAreaAverage;
    weightField     rhoU;
    weightFields    ( rho U none );  // 2012 and later
    fields          ( p pTotal pTot );
}

areaIntegrate
{
    ${__surfaceFieldValue}

    regionType      functionObjectSurface;
    name            sampled.plane1;

    operation       weightedAreaIntegrate;
    weightField     rhoU;
    weightFields    ( rho U );  // 2012 and later
    fields          ( T );
}

// Inflow uniformity
UI1
{
    ${__surfaceFieldValue}

    regionType      functionObjectSurface;
    name            sampled.plane1;

    operation       uniformity;
    fields          ( U T );
}


// Uniformity after the bend
UI2
{
    ${__surfaceFieldValue}

    regionType      functionObjectSurface;
    name            sampled.plane2;

    operation       uniformity;
    fields          ( U T );
}


// Uniformity on sampled surface
UI3
{
    ${__surfaceFieldValue}

    regionType      functionObjectSurface;
    name            sampled.plane3;

    operation       uniformity;
    fields          ( U T );
}


// Inflow uniformity, but use a scalar field for weighting
// Since this field is quite uniform, there should be no difference
T_UI1
{
    ${__surfaceFieldValue}

    regionType      functionObjectSurface;
    name            sampled.plane1;

    operation       weightedUniformity;
    weightField     T;
    fields          ( U );
}


// rhoU-weighted uniformity, including weighting U too (weird but possible)
rhoU_UI1
{
    ${__surfaceFieldValue}

    regionType      functionObjectSurface;
    name            sampled.plane1;

    operation       weightedUniformity;
    weightField     rhoU;
    fields          ( p rho U rhoU );
}


// rhoU-weighted uniformity
rhoU_UI2
{
    ${__surfaceFieldValue}

    regionType      functionObjectSurface;
    name            sampled.plane2;

    operation       weightedUniformity;
    weightField     rhoU;
    fields          ( p rho U rhoU );
}


// * * * * * * * * * * * * * * * * * Cleanup * * * * * * * * * * * * * * * * //

#remove "__.*"


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