setTimeStepFaRegionsFunctionObject.C

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/*---------------------------------------------------------------------------*\
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    Copyright (C) 2020 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.

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#include "setTimeStepFaRegionsFunctionObject.H"
#include "addToRunTimeSelectionTable.H"


// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //

namespace Foam
{
namespace functionObjects
{
    defineTypeNameAndDebug(setTimeStepFaRegionsFunctionObject, 0);
    addToRunTimeSelectionTable
    (
        functionObject,
        setTimeStepFaRegionsFunctionObject,
        dictionary
    );
}
}


// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::functionObjects::
setTimeStepFaRegionsFunctionObject::
setTimeStepFaRegionsFunctionObject
(
    const word& name,
    const Time& runTime,
    const dictionary& dict
)
:
    timeFunctionObject(name, runTime)
{
    read(dict);
}


// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //

bool Foam::functionObjects::setTimeStepFaRegionsFunctionObject::adjustTimeStep()
{
    // Wanted timestep
    scalar newDeltaT = regionDeltaT();

    static label index = -1;

    if ((time_.timeIndex() != index) && (newDeltaT < time_.deltaTValue()))
    {
        // Store current time so we don't get infinite recursion (since
        // setDeltaT calls adjustTimeStep() again)
        index = time_.timeIndex();

        // Set time, allow deltaT to be adjusted for writeInterval purposes
        const_cast<Time&>(time_).setDeltaT(newDeltaT, false);

        return true;
    }

    return false;
}


bool Foam::functionObjects::setTimeStepFaRegionsFunctionObject::read
(
    const dictionary& dict
)
{
    if (timeFunctionObject::read(dict))
    {
        // Ensure that adjustTimeStep is active
        if (!time_.controlDict().lookupOrDefault<bool>("adjustTimeStep", false))
        {
            FatalIOErrorInFunction(dict)
                << "Need to set 'adjustTimeStep' true to allow timestep control"
                << nl
                << exit(FatalIOError);
        }

        return true;
    }

    return false;
}


Foam::scalar Foam::functionObjects::setTimeStepFaRegionsFunctionObject::
regionDeltaT() const
{
    const wordList names(time_.sortedNames<regionFaModel>());

    scalar Co = 0.0;

    forAll (names, i)
    {
        const auto* regionFa = time_.cfindObject<regionFaModel>(names[i]);

        if (regionFa)
        {
            const scalar regionCo = regionFa->CourantNumber();
            if (regionCo > Co)
            {
                Co = regionCo;
            }
        }
    }

    if (names.size() > 0)
    {
        const scalar regionFaMaxCo =
            time_.controlDict().get<scalar>("regionFaMaxCo");

        const scalar maxDeltaTFact = regionFaMaxCo/(Co + SMALL);
        const scalar deltaTFact =
            min(min(maxDeltaTFact, 1.0 + 0.1*maxDeltaTFact), 1.2);

        return deltaTFact*time_.deltaTValue();
    }

    return time_.deltaTValue();
}


bool Foam::functionObjects::setTimeStepFaRegionsFunctionObject::execute()
{
    return true;
}


bool Foam::functionObjects::setTimeStepFaRegionsFunctionObject::write()
{
    return true;
}


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