DMDTemplates.C

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    Copyright (C) 2020-2021 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.
 
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#include "volFields.H"
#include "surfaceFields.H"
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
template<class Type>
bool Foam::functionObjects::DMD::getSnapshot()
{
    typedef GeometricField<Type, fvPatchField, volMesh> VolFieldType;
    typedef GeometricField<Type, fvsPatchField, surfaceMesh> SurfaceFieldType;
 
    if (foundObject<VolFieldType>(fieldName_))
    {
        return getSnapshotField<VolFieldType>();
    }
    else if (foundObject<SurfaceFieldType>(fieldName_))
    {
        return getSnapshotField<SurfaceFieldType>();
    }
 
    return false;
}
 
 
template<class GeoFieldType>
bool Foam::functionObjects::DMD::getSnapshotField()
{
    if (step_ == 0)
    {
        initialise();
    }
 
    if (z_.size() == 1)
    {
        return true;
    }
 
    // Move previous-time snapshot into previous-time slot in "z"
    // Effectively moves the lower half of "z" to its upper half
    std::rotate(z_.begin(), z_.begin() + nSnap_, z_.end());
 
    // Copy new current-time snapshot into current-time slot in "z"
    // Effectively copies the new field elements into the lower half of "z"
    const label nComps =
        pTraits<typename GeoFieldType::value_type>::nComponents;
 
    const GeoFieldType& field = lookupObject<GeoFieldType>(fieldName_);
 
    if (patch_.empty())
    {
        const label nField = field.size();
 
        for (direction dir = 0; dir < nComps; ++dir)
        {
            z_.subColumn(0, nSnap_ + dir*nField, nField) = field.component(dir);
        }
    }
    else
    {
        const label patchi = mesh_.boundaryMesh().findPatchID(patch_);
 
        if (patchi < 0)
        {
            FatalErrorInFunction
                << "Cannot find patch " << patch_
                << exit(FatalError);
        }
 
        const typename GeoFieldType::Boundary& bf = field.boundaryField();
 
        const Field<typename GeoFieldType::value_type>& pbf = bf[patchi];
 
        const label nField = pbf.size();
 
        for (direction dir = 0; dir < nComps; ++dir)
        {
            z_.subColumn(0, nSnap_ + dir*nField, nField) = pbf.component(dir);
        }
    }
 
    return true;
}
 
 
// ************************************************************************* //