timeVaryingMappedFixedValueFvPatchField.C

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#include "timeVaryingMappedFixedValueFvPatchField.H"
#include "Time.H"
#include "AverageField.H"
#include "IFstream.H"

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

template<class Type>
Foam::timeVaryingMappedFixedValueFvPatchField<Type>::
timeVaryingMappedFixedValueFvPatchField
(
    const fvPatch& p,
    const DimensionedField<Type, volMesh>& iF
)
:
    fixedValueFvPatchField<Type>(p, iF),
    fieldTableName_(iF.name()),
    setAverage_(false),
    perturb_(0),
    mapperPtr_(nullptr),
    sampleTimes_(0),
    startSampleTime_(-1),
    startSampledValues_(0),
    startAverage_(Zero),
    endSampleTime_(-1),
    endSampledValues_(0),
    endAverage_(Zero),
    offset_()
{}


template<class Type>
Foam::timeVaryingMappedFixedValueFvPatchField<Type>::
timeVaryingMappedFixedValueFvPatchField
(
    const fvPatch& p,
    const DimensionedField<Type, volMesh>& iF,
    const dictionary& dict
)
:
    fixedValueFvPatchField<Type>(p, iF, dict, false),
    fieldTableName_(iF.name()),
    setAverage_(dict.lookupOrDefault("setAverage", false)),
    perturb_(dict.lookupOrDefault("perturb", 1e-5)),
    mapMethod_
    (
        dict.lookupOrDefault<word>
        (
            "mapMethod",
            "planarInterpolation"
        )
    ),
    mapperPtr_(nullptr),
    sampleTimes_(0),
    startSampleTime_(-1),
    startSampledValues_(0),
    startAverage_(Zero),
    endSampleTime_(-1),
    endSampledValues_(0),
    endAverage_(Zero),
    offset_()
{
    if (dict.found("offset"))
    {
        offset_ = Function1<Type>::New("offset", dict);
    }

    if
    (
        mapMethod_ != "planarInterpolation"
     && mapMethod_ != "nearest"
    )
    {
        FatalIOErrorInFunction
        (
            dict
        )   << "mapMethod should be one of 'planarInterpolation'"
            << ", 'nearest'" << exit(FatalIOError);
    }

    dict.readIfPresent("fieldTable", fieldTableName_);

    if (dict.found("value"))
    {
        fvPatchField<Type>::operator==(Field<Type>("value", dict, p.size()));
    }
    else
    {
        // Note: we use evaluate() here to trigger updateCoeffs followed
        //       by re-setting of fvatchfield::updated_ flag. This is
        //       so if first use is in the next time step it retriggers
        //       a new update.
        this->evaluate(Pstream::commsTypes::blocking);
    }
}


template<class Type>
Foam::timeVaryingMappedFixedValueFvPatchField<Type>::
timeVaryingMappedFixedValueFvPatchField
(
    const timeVaryingMappedFixedValueFvPatchField<Type>& ptf,
    const fvPatch& p,
    const DimensionedField<Type, volMesh>& iF,
    const fvPatchFieldMapper& mapper
)
:
    fixedValueFvPatchField<Type>(ptf, p, iF, mapper),
    fieldTableName_(ptf.fieldTableName_),
    setAverage_(ptf.setAverage_),
    perturb_(ptf.perturb_),
    mapMethod_(ptf.mapMethod_),
    mapperPtr_(nullptr),
    sampleTimes_(0),
    startSampleTime_(-1),
    startSampledValues_(0),
    startAverage_(Zero),
    endSampleTime_(-1),
    endSampledValues_(0),
    endAverage_(Zero),
    offset_(ptf.offset_, false)
{}


template<class Type>
Foam::timeVaryingMappedFixedValueFvPatchField<Type>::
timeVaryingMappedFixedValueFvPatchField
(
    const timeVaryingMappedFixedValueFvPatchField<Type>& ptf
)
:
    fixedValueFvPatchField<Type>(ptf),
    fieldTableName_(ptf.fieldTableName_),
    setAverage_(ptf.setAverage_),
    perturb_(ptf.perturb_),
    mapMethod_(ptf.mapMethod_),
    mapperPtr_(nullptr),
    sampleTimes_(ptf.sampleTimes_),
    startSampleTime_(ptf.startSampleTime_),
    startSampledValues_(ptf.startSampledValues_),
    startAverage_(ptf.startAverage_),
    endSampleTime_(ptf.endSampleTime_),
    endSampledValues_(ptf.endSampledValues_),
    endAverage_(ptf.endAverage_),
    offset_(ptf.offset_, false)
{}


template<class Type>
Foam::timeVaryingMappedFixedValueFvPatchField<Type>::
timeVaryingMappedFixedValueFvPatchField
(
    const timeVaryingMappedFixedValueFvPatchField<Type>& ptf,
    const DimensionedField<Type, volMesh>& iF
)
:
    fixedValueFvPatchField<Type>(ptf, iF),
    fieldTableName_(ptf.fieldTableName_),
    setAverage_(ptf.setAverage_),
    perturb_(ptf.perturb_),
    mapMethod_(ptf.mapMethod_),
    mapperPtr_(nullptr),
    sampleTimes_(ptf.sampleTimes_),
    startSampleTime_(ptf.startSampleTime_),
    startSampledValues_(ptf.startSampledValues_),
    startAverage_(ptf.startAverage_),
    endSampleTime_(ptf.endSampleTime_),
    endSampledValues_(ptf.endSampledValues_),
    endAverage_(ptf.endAverage_),
    offset_(ptf.offset_, false)
{}


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

template<class Type>
void Foam::timeVaryingMappedFixedValueFvPatchField<Type>::autoMap
(
    const fvPatchFieldMapper& m
)
{
    fixedValueFvPatchField<Type>::autoMap(m);
    if (startSampledValues_.size())
    {
        startSampledValues_.autoMap(m);
        endSampledValues_.autoMap(m);
    }
    // Clear interpolator
    mapperPtr_.clear();
    startSampleTime_ = -1;
    endSampleTime_ = -1;
}


template<class Type>
void Foam::timeVaryingMappedFixedValueFvPatchField<Type>::rmap
(
    const fvPatchField<Type>& ptf,
    const labelList& addr
)
{
    fixedValueFvPatchField<Type>::rmap(ptf, addr);

    const timeVaryingMappedFixedValueFvPatchField<Type>& tiptf =
        refCast<const timeVaryingMappedFixedValueFvPatchField<Type>>(ptf);

    startSampledValues_.rmap(tiptf.startSampledValues_, addr);
    endSampledValues_.rmap(tiptf.endSampledValues_, addr);

    // Clear interpolator
    mapperPtr_.clear();
    startSampleTime_ = -1;
    endSampleTime_ = -1;
}


template<class Type>
void Foam::timeVaryingMappedFixedValueFvPatchField<Type>::checkTable()
{
    // Initialise
    if (mapperPtr_.empty())
    {
        // Reread values and interpolate
        fileName samplePointsFile
        (
            this->db().time().constant()
           /"boundaryData"
           /this->patch().name()
           /"points"
        );

        pointField samplePoints((IFstream(samplePointsFile)()));

        if (debug)
        {
            Info<< "timeVaryingMappedFixedValueFvPatchField :"
                << " Read " << samplePoints.size() << " sample points from "
                << samplePointsFile << endl;
        }


        // tbd: run-time selection
        bool nearestOnly =
        (
           !mapMethod_.empty()
         && mapMethod_ != "planarInterpolation"
        );

        // Allocate the interpolator
        mapperPtr_.reset
        (
            new pointToPointPlanarInterpolation
            (
                samplePoints,
                 this->patch().patch().faceCentres(),
                perturb_,
                nearestOnly
            )
        );

        // Read the times for which data is available
        const fileName samplePointsDir = samplePointsFile.path();
        sampleTimes_ = Time::findTimes(samplePointsDir);

        if (debug)
        {
            Info<< "timeVaryingMappedFixedValueFvPatchField : In directory "
                << samplePointsDir << " found times "
                << pointToPointPlanarInterpolation::timeNames(sampleTimes_)
                << endl;
        }
    }


    // Find current time in sampleTimes
    label lo = -1;
    label hi = -1;

    bool foundTime = mapperPtr_().findTime
    (
        sampleTimes_,
        startSampleTime_,
        this->db().time().value(),
        lo,
        hi
    );

    if (!foundTime)
    {
        FatalErrorInFunction
            << "Cannot find starting sampling values for current time "
            << this->db().time().value() << nl
            << "Have sampling values for times "
            << pointToPointPlanarInterpolation::timeNames(sampleTimes_) << nl
            << "In directory "
            <<  this->db().time().constant()/"boundaryData"/this->patch().name()
            << "\n    on patch " << this->patch().name()
            << " of field " << fieldTableName_
            << exit(FatalError);
    }


    // Update sampled data fields.

    if (lo != startSampleTime_)
    {
        startSampleTime_ = lo;

        if (startSampleTime_ == endSampleTime_)
        {
            // No need to reread since are end values
            if (debug)
            {
                Pout<< "checkTable : Setting startValues to (already read) "
                    <<   "boundaryData"
                        /this->patch().name()
                        /sampleTimes_[startSampleTime_].name()
                    << endl;
            }
            startSampledValues_ = endSampledValues_;
            startAverage_ = endAverage_;
        }
        else
        {
            if (debug)
            {
                Pout<< "checkTable : Reading startValues from "
                    <<   "boundaryData"
                        /this->patch().name()
                        /sampleTimes_[lo].name()
                    << endl;
            }


            // Reread values and interpolate
            fileName valsFile
            (
                this->db().time().constant()
               /"boundaryData"
               /this->patch().name()
               /sampleTimes_[startSampleTime_].name()
               /fieldTableName_
            );

            Field<Type> vals;

            if (setAverage_)
            {
                AverageField<Type> avals((IFstream(valsFile)()));
                vals = avals;
                startAverage_ = avals.average();
            }
            else
            {
                IFstream(valsFile)() >> vals;
            }

            if (vals.size() != mapperPtr_().sourceSize())
            {
                FatalErrorInFunction
                    << "Number of values (" << vals.size()
                    << ") differs from the number of points ("
                    <<  mapperPtr_().sourceSize()
                    << ") in file " << valsFile << exit(FatalError);
            }

            startSampledValues_ = mapperPtr_().interpolate(vals);
        }
    }

    if (hi != endSampleTime_)
    {
        endSampleTime_ = hi;

        if (endSampleTime_ == -1)
        {
            // endTime no longer valid. Might as well clear endValues.
            if (debug)
            {
                Pout<< "checkTable : Clearing endValues" << endl;
            }
            endSampledValues_.clear();
        }
        else
        {
            if (debug)
            {
                Pout<< "checkTable : Reading endValues from "
                    <<   "boundaryData"
                        /this->patch().name()
                        /sampleTimes_[endSampleTime_].name()
                    << endl;
            }

            // Reread values and interpolate
            fileName valsFile
            (
                this->db().time().constant()
               /"boundaryData"
               /this->patch().name()
               /sampleTimes_[endSampleTime_].name()
               /fieldTableName_
            );

            Field<Type> vals;

            if (setAverage_)
            {
                AverageField<Type> avals((IFstream(valsFile)()));
                vals = avals;
                endAverage_ = avals.average();
            }
            else
            {
                IFstream(valsFile)() >> vals;
            }

            if (vals.size() != mapperPtr_().sourceSize())
            {
                FatalErrorInFunction
                    << "Number of values (" << vals.size()
                    << ") differs from the number of points ("
                    <<  mapperPtr_().sourceSize()
                    << ") in file " << valsFile << exit(FatalError);
            }

            endSampledValues_ = mapperPtr_().interpolate(vals);
        }
    }
}


template<class Type>
void Foam::timeVaryingMappedFixedValueFvPatchField<Type>::updateCoeffs()
{
    if (this->updated())
    {
        return;
    }


    checkTable();

    // Interpolate between the sampled data

    Type wantedAverage;

    if (endSampleTime_ == -1)
    {
        // Only start value
        if (debug)
        {
            Pout<< "updateCoeffs : Sampled, non-interpolated values"
                << " from start time:"
                << sampleTimes_[startSampleTime_].name() << nl;
        }

        this->operator==(startSampledValues_);
        wantedAverage = startAverage_;
    }
    else
    {
        scalar start = sampleTimes_[startSampleTime_].value();
        scalar end = sampleTimes_[endSampleTime_].value();

        scalar s = (this->db().time().value() - start)/(end - start);

        if (debug)
        {
            Pout<< "updateCoeffs : Sampled, interpolated values"
                << " between start time:"
                << sampleTimes_[startSampleTime_].name()
                << " and end time:" << sampleTimes_[endSampleTime_].name()
                << " with weight:" << s << endl;
        }

        this->operator==((1 - s)*startSampledValues_ + s*endSampledValues_);
        wantedAverage = (1 - s)*startAverage_ + s*endAverage_;
    }

    // Enforce average. Either by scaling (if scaling factor > 0.5) or by
    // offsetting.
    if (setAverage_)
    {
        const Field<Type>& fld = *this;

        Type averagePsi =
            gSum(this->patch().magSf()*fld)
           /gSum(this->patch().magSf());

        if (debug)
        {
            Pout<< "updateCoeffs :"
                << " actual average:" << averagePsi
                << " wanted average:" << wantedAverage
                << endl;
        }

        if (mag(averagePsi) < VSMALL)
        {
            // Field too small to scale. Offset instead.
            const Type offset = wantedAverage - averagePsi;
            if (debug)
            {
                Pout<< "updateCoeffs :"
                    << " offsetting with:" << offset << endl;
            }
            this->operator==(fld + offset);
        }
        else
        {
            const scalar scale = mag(wantedAverage)/mag(averagePsi);

            if (debug)
            {
                Pout<< "updateCoeffs :"
                    << " scaling with:" << scale << endl;
            }
            this->operator==(scale*fld);
        }
    }

    // Apply offset to mapped values
    if (offset_.valid())
    {
        const scalar t = this->db().time().timeOutputValue();
        this->operator==(*this + offset_->value(t));
    }

    if (debug)
    {
        Pout<< "updateCoeffs : set fixedValue to min:" << gMin(*this)
            << " max:" << gMax(*this)
            << " avg:" << gAverage(*this) << endl;
    }

    fixedValueFvPatchField<Type>::updateCoeffs();
}


template<class Type>
void Foam::timeVaryingMappedFixedValueFvPatchField<Type>::write
(
    Ostream& os
) const
{
    fvPatchField<Type>::write(os);

    this->writeEntryIfDifferent(os, "setAverage", Switch(false), setAverage_);

    this->writeEntryIfDifferent(os, "perturb", scalar(1e-5), perturb_);

    this->writeEntryIfDifferent
    (
        os,
        "fieldTable",
        this->internalField().name(),
        fieldTableName_
    );

    this->writeEntryIfDifferent
    (
        os,
        "mapMethod",
        word("planarInterpolation"),
        mapMethod_
    );

    if (offset_.valid())
    {
        offset_->writeData(os);
    }

    this->writeEntry("value", os);
}


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