controlDict

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2506                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    object      controlDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

application     moveDynamicMesh;

startFrom       startTime;

startTime       0;

stopAt          endTime;

endTime         10;

deltaT          1;

writeControl    timeStep;

writeInterval   10;

purgeWrite      0;

writeFormat     ascii;

writePrecision  6;

writeCompression off;

timeFormat      general;

timePrecision   6;

runTimeModifiable true;

functions
{
    relaxationFactor
    {
        // Convoluted example - control relaxation factor
        libs            (utilityFunctionObjects);
        type            coded;

        name            relaxationFactor;

        codeRead
        #{
            const IOobject io
            (
                "banana",
                mesh().time().constant(),
                mesh().thisDb()
            );

            auto* ptr =
                io.db().getObjectPtr<uniformDimensionedScalarField>(io.name());

            if (!ptr)
            {
                Info<< "Registering relaxation factor " << io.name() << endl;

                ptr = new uniformDimensionedScalarField
                (
                    io,
                    dimless,
                    0.80
                );
                ptr->store();
            }
        #};

        codeExecute
        #{
            const IOobject io
            (
                "banana",
                mesh().time().constant(),
                mesh().thisDb()
            );

            auto& val =
                io.db().lookupObjectRef<uniformDimensionedScalarField>
                (
                    io.name()
                );

            // Ramp a bit
            val.value() = min(0.99, val.value()+0.01);

            Info<< "Set relaxation factor to " << val << endl;
        #};
    }
}


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