DMDImpl.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
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    Copyright (C) 2023 OpenCFD Ltd.
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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
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
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#include "volFields.H"
#include "surfaceFields.H"
#include "zeroGradientFvPatchFields.H"
 
// * * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * //
 
template<class GeoType>
bool Foam::ROMmodels::DMD::createAndWriteImpl() const
{
    typedef typename GeoType::value_type Type;
 
    const wordList modeReNames(modeNames(word("Re")));
    const wordList modeImNames(modeNames(word("Im")));
 
    for (const label i : modes_)
    {
        const auto* modeRePtr = mesh_.cfindObject<GeoType>(modeReNames[i]);
 
        if (!modeRePtr) return false;
 
        const auto* modeImPtr = mesh_.cfindObject<GeoType>(modeImNames[i]);
 
        if (!modeImPtr) return false;
    }
 
 
    forAll(times_, timei)
    {
        runTime_.setTime(times_[timei], timei);
 
        Info<< "\nTime = " << runTime_.timeName() << endl;
 
        // Calculate the eigenvalue exponent corresponding to specified time
        const scalar k = (times_[timei].value() - startTime_)/deltaT_;
 
        GeoType reconstructedFld
        (
            IOobject
            (
                IOobject::scopedName(fieldName_, "reconstructed"),
                runTime_.timeName(),
                mesh_,
                IOobject::NO_READ,
                IOobject::NO_WRITE,
                IOobject::NO_REGISTER
            ),
            mesh_,
            dimensioned<Type>(dimless, Zero),
            fvPatchFieldBase::zeroGradientType()
        );
 
        forAll(modes_, i)
        {
            const label j = modes_[i];
            const auto& modeRe = mesh_.lookupObject<GeoType>(modeReNames[j]);
            const auto& modeIm = mesh_.lookupObject<GeoType>(modeImNames[j]);
 
            const complex evalk(pow(evals_[i], k));
 
            // (K:Eq. 84)
            reconstructedFld +=
            (
                (modeRe*amps_[i].Re() - modeIm*amps_[i].Im())*evalk.Re()
              - (modeRe*amps_[i].Im() + modeIm*amps_[i].Re())*evalk.Im()
            );
        }
 
        reconstructedFld.correctBoundaryConditions();
 
        reconstructedFld.dimensions().reset(dims_);
 
        reconstructedFld.write();
    }
 
    return true;
}
 
 
// ************************************************************************* //