Relaxation.C

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    Copyright (C) 2023 OpenCFD Ltd.
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#include "Relaxation.H"
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
template<class CloudType>
Foam::DampingModels::Relaxation<CloudType>::Relaxation
(
    const dictionary& dict,
    CloudType& owner
)
:
    DampingModel<CloudType>(dict, owner, typeName),
    uAverage_(nullptr),
    oneByTimeScaleAverage_(nullptr)
{}
 
 
template<class CloudType>
Foam::DampingModels::Relaxation<CloudType>::Relaxation
(
    const Relaxation<CloudType>& cm
)
:
    DampingModel<CloudType>(cm),
    uAverage_(nullptr),
    oneByTimeScaleAverage_(cm.oneByTimeScaleAverage_->clone())
{}
 
 
// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
 
template<class CloudType>
Foam::DampingModels::Relaxation<CloudType>::
~Relaxation()
{}
 
 
// * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
template<class CloudType>
void Foam::DampingModels::Relaxation<CloudType>::cacheFields(const bool store)
{
    if (store)
    {
        const fvMesh& mesh = this->owner().mesh();
        const word& cloudName = this->owner().name();
 
        const auto& volumeAverage =
            mesh.lookupObject<AveragingMethod<scalar>>
            (
                IOobject::scopedName(cloudName, "volumeAverage")
            );
        const auto& radiusAverage =
            mesh.lookupObject<AveragingMethod<scalar>>
            (
                IOobject::scopedName(cloudName, "radiusAverage")
            );
        const auto& uAverage =
            mesh.lookupObject<AveragingMethod<vector>>
            (
                IOobject::scopedName(cloudName, "uAverage")
            );
        const auto& uSqrAverage =
            mesh.lookupObject<AveragingMethod<scalar>>
            (
                IOobject::scopedName(cloudName, "uSqrAverage")
            );
        const auto& frequencyAverage =
            mesh.lookupObject<AveragingMethod<scalar>>
            (
                IOobject::scopedName(cloudName, "frequencyAverage")
            );
 
        uAverage_ = &uAverage;
 
        oneByTimeScaleAverage_.reset
        (
            AveragingMethod<scalar>::New
            (
                IOobject
                (
                    IOobject::scopedName(cloudName, "oneByTimeScaleAverage"),
                    this->owner().db().time().timeName(),
                    mesh
                ),
                this->owner().solution().dict(),
                mesh
            ).ptr()
        );
 
        oneByTimeScaleAverage_() =
        (
            this->timeScaleModel_->oneByTau
            (
                volumeAverage,
                radiusAverage,
                uSqrAverage,
                frequencyAverage
            )
        )();
    }
    else
    {
        uAverage_ = nullptr;
        oneByTimeScaleAverage_.clear();
    }
}
 
 
template<class CloudType>
Foam::vector Foam::DampingModels::Relaxation<CloudType>::velocityCorrection
(
    typename CloudType::parcelType& p,
    const scalar deltaT
) const
{
    const tetIndices tetIs(p.currentTetIndices());
 
    const scalar x =
        deltaT*oneByTimeScaleAverage_->interpolate(p.coordinates(), tetIs);
 
    const vector u = uAverage_->interpolate(p.coordinates(), tetIs);
 
    return (u - p.U())*x/(x + 2.0);
}
 
 
// ************************************************************************* //