STDMDTemplates.C

Go to the documentation of this file.

/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2020-2021 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
\*---------------------------------------------------------------------------*/
 
#include "volFields.H"
#include "surfaceFields.H"
#include "fixedValueFvPatchField.H"
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
template<class Type>
void Foam::DMDModels::STDMD::filterIndexed
(
    List<Type>& lst,
    const UList<label>& indices
)
{
    // Elements within [a, b]
    List<Type> lstWithin(indices.size());
 
    // Copy if frequency of element is within [a, b]
    label j = 0;
    for (const label i : indices)
    {
        lstWithin[j] = lst[i];
        ++j;
    }
    lst.transfer(lstWithin);
}
 
 
template<class MatrixType>
void Foam::DMDModels::STDMD::filterIndexed
(
    MatrixType& mat,
    const UList<label>& indices
)
{
    // Elements within [a, b]
    MatrixType matWithin(labelPair(mat.m(), indices.size()));
 
    // Copy if frequency of element is within [a, b]
    label j = 0;
    for (const label i : indices)
    {
        matWithin.subColumn(j) = mat.subColumn(i);
        ++j;
    }
    mat.transfer(matWithin);
}
 
 
template<class Type>
bool Foam::DMDModels::STDMD::modes()
{
    typedef GeometricField<Type, fvPatchField, volMesh> VolFieldType;
    typedef GeometricField<Type, fvsPatchField, surfaceMesh> SurfaceFieldType;
 
    if (mesh_.foundObject<VolFieldType>(fieldName_))
    {
        return calcModes<VolFieldType>();
    }
    else if (mesh_.foundObject<SurfaceFieldType>(fieldName_))
    {
        return calcModes<SurfaceFieldType>();
    }
 
    return false;
}
 
 
template<class GeoFieldType>
bool Foam::DMDModels::STDMD::calcModes()
{
    typedef typename GeoFieldType::value_type Type;
 
    // Resize the number of output variables to "nModes" if requested
    if (magsi_.size() > nModes_)
    {
        magsi_.resize(nModes_);
    }
 
    // Compute and write modes one by one
    const RMatrix primitiveMode(Qupper_*RxInv_);
    Qupper_.clear();
    RxInv_.clear();
 
    label modei = 0;
    for (const label magi : magsi_)
    {
        GeoFieldType modeRe
        (
            IOobject
            (
                "modeRe_" + std::to_string(modei)
                + "_" + fieldName_ + "_" + name_,
                mesh_.time().timeName(),
                mesh_,
                IOobject::NO_READ,
                IOobject::NO_WRITE,
                IOobject::NO_REGISTER
            ),
            mesh_,
            dimensioned<Type>(dimless, Zero),
            fixedValueFvPatchField<Type>::typeName
        );
 
        GeoFieldType modeIm
        (
            IOobject
            (
                "modeIm_" + std::to_string(modei)
                + "_" + fieldName_ + "_" + name_,
                mesh_.time().timeName(),
                mesh_,
                IOobject::NO_READ,
                IOobject::NO_WRITE,
                IOobject::NO_REGISTER
            ),
            mesh_,
            dimensioned<Type>(dimless, Zero),
            fixedValueFvPatchField<Type>::typeName
        );
 
        if (modeRe.size() != 0 && !empty_)
        {
            if (patches_.empty())
            {
                auto& re = modeRe.primitiveFieldRef();
                auto& im = modeIm.primitiveFieldRef();
 
                calcMode(re, im, primitiveMode, magi);
            }
            else
            {
                label rowi = 0;
                const labelList patchis
                (
                    mesh_.boundaryMesh().patchSet(patches_).sortedToc()
                );
 
                for (const label patchi : patchis)
                {
                    auto& re = modeRe.boundaryFieldRef()[patchi];
                    auto& im = modeIm.boundaryFieldRef()[patchi];
 
                    calcMode(re, im, primitiveMode, magi, rowi);
 
                    rowi += re.size()*pTraits<Type>::nComponents;
                }
            }
        }
 
        modeRe.write();
        modeIm.write();
        ++modei;
    }
 
    return true;
}
 
 
template<class GeoFieldType>
void Foam::DMDModels::STDMD::calcMode
(
    GeoFieldType& modeRe,
    GeoFieldType& modeIm,
    const RMatrix& primitiveMode,
    const label magi,
    const label rowi
)
{
    const label szfld = modeRe.size();
    const label szfldcmps =
        szfld*pTraits<typename GeoFieldType::value_type>::nComponents;
 
    for (label i = rowi; i < szfldcmps + rowi; ++i)
    {
        complex mode(Zero);
        for (label j = 0; j < evecs_.m(); ++j)
        {
            mode += primitiveMode(i, j)*evecs_(j, magi);
        }
 
        const label k = (i-rowi)%szfld;
 
        if constexpr
        (
            std::is_same_v<scalar, typename GeoFieldType::value_type>
        )
        {
            modeRe[k] = mode.real();
            modeIm[k] = mode.imag();
        }
        else
        {
            const label m = (i-rowi)/szfld;
            modeRe[k][m] = mode.real();
            modeIm[k][m] = mode.imag();
        }
    }
}
 
 
// ************************************************************************* //