ITHACAcoeffsMass.C

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/*---------------------------------------------------------------------------*\
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 * In real Time Highly Advanced Computational Applications for Finite Volumes
 * Copyright (C) 2017 by the ITHACA-FV authors
-------------------------------------------------------------------------------
License
    This file is part of ITHACA-FV
    ITHACA-FV is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
    ITHACA-FV 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 Lesser General Public License for more details.
    You should have received a copy of the GNU Lesser General Public License
    along with ITHACA-FV. If not, see <http://www.gnu.org/licenses/>.
\*---------------------------------------------------------------------------*/
#include "ITHACAcoeffsMass.H"
 
namespace ITHACAutilities
{
 
template<class Type, template<class> class PatchField, class GeoMesh>
PtrList<GeometricField<Type, PatchField, GeoMesh>> reconstructFromCoeff(
            PtrList<GeometricField<Type, PatchField, GeoMesh>>& modes,
            Eigen::MatrixXd& coeff_matrix, label Nmodes)
{
    PtrList<GeometricField<Type, PatchField, GeoMesh>> rec_field;
    rec_field.resize(0);
 
    for (label k = 0; k < coeff_matrix.cols(); k++)
    {
        for (label i = 0; i < Nmodes; i++)
            if ( i == 0)
            {
                rec_field.append(modes[i]*coeff_matrix(i, k));
            }
            else
            {
                rec_field[k] +=  modes[i] * coeff_matrix(i, k);
            }
    }
 
    return rec_field;
}
 
template PtrList<GeometricField<scalar, fvPatchField, volMesh>>
reconstructFromCoeff(
    PtrList<GeometricField<scalar, fvPatchField, volMesh>>& modes,
    Eigen::MatrixXd& coeff_matrix, label Nmodes);
template PtrList<GeometricField<vector, fvPatchField, volMesh>>
reconstructFromCoeff(
    PtrList<GeometricField<vector, fvPatchField, volMesh>>& modes,
    Eigen::MatrixXd& coeff_matrix, label Nmodes);
template PtrList<GeometricField<tensor, fvPatchField, volMesh>>
reconstructFromCoeff(
    PtrList<GeometricField<tensor, fvPatchField, volMesh>>& modes,
    Eigen::MatrixXd& coeff_matrix, label Nmodes);
 
template<class Type, template<class> class PatchField, class GeoMesh>
Eigen::MatrixXd getMassMatrix(
    PtrList<GeometricField<Type, PatchField, GeoMesh>>& modes, label Nmodes,
    bool consider_volumes)
{
    label Msize;
 
    if (Nmodes == 0)
    {
        Msize =  modes.size();
    }
    else
    {
        Msize = Nmodes;
    }
 
    M_Assert(modes.size() >= Msize,
             "The Number of requested modes is larger then the available quantity.");
    Eigen::MatrixXd F = Foam2Eigen::PtrList2Eigen(modes);
    Eigen::MatrixXd M;
 
    if (consider_volumes)
    {
        Eigen::VectorXd V = getMassMatrixFV(modes[0]);
        M = F.transpose().topRows(Msize) * V.asDiagonal() * F.leftCols(Msize);
    }
    else
    {
        M = F.transpose().topRows(Msize) * F.leftCols(Msize);
    }
 
    if (Pstream::parRun())
    {
        reduce(M, sumOp<Eigen::MatrixXd>());
    }
 
    return M;
}
 
template Eigen::MatrixXd getMassMatrix(
    PtrList<GeometricField<scalar, fvPatchField, volMesh>>& modes, label Nmodes,
    bool consider_volumes);
 
template Eigen::MatrixXd getMassMatrix(
    PtrList<GeometricField<scalar, fvsPatchField, surfaceMesh>>& modes,
    label Nmodes,
    bool consider_volumes = false);
 
template Eigen::MatrixXd getMassMatrix(
    PtrList<GeometricField<vector, fvPatchField, volMesh>>& modes, label Nmodes,
    bool consider_volumes);
 
template<class Type, template<class> class PatchField, class GeoMesh>
Eigen::VectorXd getMassMatrixFV(
    GeometricField<Type, PatchField, GeoMesh>& snapshot)
{
    Eigen::MatrixXd snapEigen = Foam2Eigen::field2Eigen(snapshot);
    label dim = std::nearbyint(snapEigen.rows() / (snapshot.mesh().V()).size());
    Eigen::VectorXd volumes = Foam2Eigen::field2Eigen(snapshot.mesh().V());
    Eigen::VectorXd vol3 = volumes.replicate(dim, 1);
    return vol3;
}
 
template Eigen::VectorXd getMassMatrixFV(
    GeometricField<scalar, fvPatchField, volMesh>& snapshot);
template Eigen::VectorXd getMassMatrixFV(
    GeometricField<vector, fvPatchField, volMesh>& snapshot);
 
template<class Type, template<class> class PatchField, class GeoMesh>
Eigen::VectorXd getCoeffs(GeometricField<Type, PatchField, GeoMesh>&
                          snapshot,
                          PtrList<GeometricField<Type, PatchField, GeoMesh>>& modes, label Nmodes,
                          bool consider_volumes)
{
    label Msize;
 
    if (Nmodes == 0)
    {
        Msize =  modes.size();
    }
    else
    {
        Msize = Nmodes;
    }
 
    M_Assert(modes.size() >= Msize,
             "The Number of requested modes is larger then the available quantity.");
    Eigen::MatrixXd F = Foam2Eigen::PtrList2Eigen(modes);
    Eigen::MatrixXd M_matrix = getMassMatrix(modes, Nmodes, consider_volumes);
    Eigen::MatrixXd snapEigen = Foam2Eigen::field2Eigen(snapshot);
    Eigen::VectorXd a(Msize);
    Eigen::VectorXd b(Msize);
 
    if (consider_volumes)
    {
        Eigen::VectorXd V = getMassMatrixFV(modes[0]);
        b = F.transpose().topRows(Msize) * V.asDiagonal() * snapEigen;
    }
    else
    {
        b = F.transpose().topRows(Msize) * snapEigen;
    }
 
    if (Pstream::parRun())
    {
        reduce(b, sumOp<Eigen::VectorXd>());
    }
 
    a = M_matrix.fullPivLu().solve(b);
    return a;
}
 
template Eigen::VectorXd getCoeffs(
    GeometricField<scalar, fvPatchField, volMesh>&
    snapshot, PtrList<GeometricField<scalar, fvPatchField, volMesh>>& modes,
    label Nmodes,
    bool consider_volumes);
 
template Eigen::VectorXd getCoeffs(
    GeometricField<scalar, fvsPatchField, surfaceMesh>&
    snapshot, PtrList<GeometricField<scalar, fvsPatchField, surfaceMesh>>& modes,
    label Nmodes,
    bool consider_volumes = false);
 
template Eigen::VectorXd getCoeffs(
    GeometricField<vector, fvPatchField, volMesh>&
    snapshot, PtrList<GeometricField<vector, fvPatchField, volMesh>>& modes,
    label Nmodes,
    bool consider_volumes);
 
template<class Type, template<class> class PatchField, class GeoMesh>
Eigen::MatrixXd getCoeffs(PtrList<GeometricField<Type, PatchField, GeoMesh>>&
                          snapshots,
                          PtrList<GeometricField<Type, PatchField, GeoMesh>>& modes, label Nmodes,
                          bool consider_volumes)
{
    label Msize;
 
    if (Nmodes == 0)
    {
        Msize =  modes.size();
    }
    else
    {
        Msize = Nmodes;
    }
 
    M_Assert(modes.size() >= Msize,
             "The Number of requested modes is larger then the available quantity.");
    Eigen::MatrixXd coeff(Msize, snapshots.size());
 
    for (auto i = 0; i < snapshots.size(); i++)
    {
        coeff.col(i) = getCoeffs(snapshots[i], modes, Nmodes, consider_volumes);
    }
 
    return coeff;
}
 
template Eigen::MatrixXd getCoeffs(
    PtrList<GeometricField<scalar, fvPatchField, volMesh>>&
    snapshot, PtrList<GeometricField<scalar, fvPatchField, volMesh>>& modes,
    label Nmodes,
    bool consider_volumes);
 
template Eigen::MatrixXd getCoeffs(
    PtrList<GeometricField<vector, fvPatchField, volMesh>>&
    snapshot, PtrList<GeometricField<vector, fvPatchField, volMesh>>& modes,
    label Nmodes,
    bool consider_volumes);
 
template Eigen::MatrixXd getCoeffs(
    PtrList<GeometricField<scalar, fvsPatchField, surfaceMesh>>&
    snapshot, PtrList<GeometricField<scalar, fvsPatchField, surfaceMesh>>& modes,
    label Nmodes,
    bool consider_volumes);
 
Eigen::MatrixXd parTimeCombMat(List<Eigen::VectorXd>
                               acquiredSnapshotsTimes,
                               Eigen::MatrixXd parameters)
{
    label parsNum = parameters.cols();
    label parsSamplesNum = parameters.rows();
    M_Assert(parsSamplesNum == acquiredSnapshotsTimes.size(),
             "The list of time instants does not have the same number of vectors as the number of parameters samples");
    Eigen::MatrixXd comb;
    label totalSnapshotsNum = 0;
 
    for (label k = 0; k < acquiredSnapshotsTimes.size(); k++)
    {
        totalSnapshotsNum += acquiredSnapshotsTimes[k].size();
    }
 
    comb.resize(totalSnapshotsNum, parsNum + 1);
    label i = 0;
 
    for (label j = 0; j < acquiredSnapshotsTimes.size(); j++)
    {
        for (label k = 0; k < acquiredSnapshotsTimes[j].size(); k++)
        {
            comb(i, parsNum) = (acquiredSnapshotsTimes[j])(k, 0);
            comb.block(i, 0, 1, parsNum) = parameters.row(j);
            i = i + 1;
        }
    }
 
    return comb;
}
 
}