FFTCalculator.h

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//=======================================================================================
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//
//  This file is part of VirtualFluids. VirtualFluids 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.
//
//  VirtualFluids 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.
//
//  SPDX-License-Identifier: GPL-3.0-or-later
//  SPDX-FileCopyrightText: Copyright © VirtualFluids Project contributors, see AUTHORS.md in root folder
//
//=======================================================================================
#ifndef FFTCALCULATOR_H
#define FFTCALCULATOR_H
 
#include <memory>
#include <vector>
#include <fftw3.h>
 
class SimulationResults;
class EvaluationParameter;
class TestResults;
class PhiAndNuTest;
 
class FFTCalculator
{
public:
    static std::shared_ptr<FFTCalculator> getInstance();
    
    double calcNy(std::vector<std::vector<double> > data, bool transposeData, int lx, int lz, int timeStepLength);
    double calcPhiDiff(std::vector<std::vector<double> > data, bool transposeData, int lx, int lz, int timeStepLength);
 
    double calcAmplitudeForTimeStep(std::vector<double> data, bool transposeData, int lx, int lz);
 
private:
    FFTCalculator();
    void init();
    double calcNy();
    double calcPhiDiff();
    std::vector<double> calcPhiForAllSteps();
    std::vector<double> calcLinReg(std::vector<double> y);
    std::vector<double> calcLogAmplitudeForAllSteps();
    std::vector<double> calcAmplitudeForAllSteps();
    void calcFFT2D(unsigned int step);
    std::vector<std::vector<double> > transpose(std::vector<std::vector<double> >);
    void initDataForFFT(fftw_complex* input, unsigned int step);
    void setFFTResults(fftw_complex* result, unsigned int step);
 
    std::vector<std::vector<double> > data;
    std::vector<std::vector<double> > fftResultsIm;
    std::vector<std::vector<double> > fftResultsRe;
    
    bool fftCalculated;
    bool transposeData;
    double lx, lz;
    double timeStepLength;
};
#endif