NLsolve.H

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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/>.
\*---------------------------------------------------------------------------*/
fv::options& fvOptions = _fvOptions();
surfaceScalarField& phi = _phi();
volScalarField& rho = _rho();
fluidThermo& thermo = pThermo();
volScalarField& psi = _psi();
pressureControl& pressureControl = _pressureControl();
fvMesh& mesh = _mesh();
dimensionedScalar& initialMass = _initialMass();
bool closedVolume = false;
 
scalar residual = 1;
scalar eresidual = 1;
Vector<double> uresidual_v(0, 0, 0);
scalar presidual = 1;
 
ITHACAparameters* para = ITHACAparameters::getInstance();
middleStep = para->ITHACAdict->lookupOrDefault<int>("middleStep", 20);
label csolve = 0;
label saver = 0;
label folderN = 0;
std::clock_t startOff;
startOff = std::clock();
double durationOff;
 
// files to save data
std::ofstream res_os;
std::ofstream snaps_os;
std::ofstream iters;
std::ofstream res_U;
std::ofstream res_P;
std::ofstream res_E;
std::ofstream cpuTimes;

res_os.open(folder + "/residuals", std::ios_base::app);
snaps_os.open(folder + "/snaps", std::ios_base::app);
iters.open(folder + "/iters", std::ios_base::app);
cpuTimes.open(folder + "/cpuTimes", std::ios_base::app);
res_U.open(folder + name(counter) + "/res_U", std::ios_base::app);
res_P.open(folder + name(counter) + "/res_P", std::ios_base::app);
res_E.open(folder + name(counter) + "/res_E", std::ios_base::app);
 
// Variable that can be changed
// std::ofstream res_os;
// res_os.open("./ITHACAoutput/Offline/residuals", std::ios_base::app);
 
tolerance = ITHACAdict->lookupOrDefault<scalar>("tolerance", 1e-5);
maxIter = ITHACAdict->lookupOrDefault<scalar>("maxIter", 2000);
 
turbulence->validate();
 
#if OFVER == 6
 
while (simple.loop(runTime) && residual > tolerance && csolve < maxIter )
#else
while (simple.loop() && residual > tolerance && csolve < maxIter )
#endif
{
    Info << "Time = " << runTime.timeName() << nl << endl;
    //Momentum equation phase
    getUmatrix(U);
 
    if (simple.momentumPredictor())
    {
        uresidual_v = solve(Ueqn_global() == - getGradP(p)).initialResidual(); //Working
        fvOptions.correct(U);
    }
 
    //Energy equation phase
    getEmatrix(U, p);
    eresidual = Eeqn_global().solve().initialResidual();
    fvOptions.correct(thermo.he());
    thermo.correct(); // Here are calculated both temperature and density based on P,U and he.
    // Pressure equation phase
    constrainPressure(p, rho, U, getPhiHbyA(Ueqn_global(), U, p),
                      getRhorAUf(Ueqn_global()));// Update the pressure BCs to ensure flux consistency
    surfaceScalarField phiHbyACalculated = getPhiHbyA(Ueqn_global(), U, p);
    closedVolume = adjustPhi(phiHbyACalculated, U, p);
 
    while (simple.correctNonOrthogonal())
    {
        getPmatrix(Ueqn_global(), U, p);
        presidual = Peqn_global().solve().initialResidual();
 
        if (simple.finalNonOrthogonalIter())
        {
            phi = getPhiHbyA(Ueqn_global(), U, p) + Peqn_global().flux();
        }
    }
 
#include "continuityErrs.H"
    p.relax();// Explicitly relax pressure for momentum corrector
    U = HbyA() - (1.0 / Ueqn_global().A()) * getGradP(p);
    U.correctBoundaryConditions();
    fvOptions.correct(U);
    bool pLimited = pressureControl.limit(p);
 
    // For closed-volume cases adjust the pressure and density levels to obey overall mass continuity
    if (closedVolume)
    {
        p += (initialMass - fvc::domainIntegrate(psi * p))
             / fvc::domainIntegrate(psi);
    }
 
    if (pLimited || closedVolume)
    {
        p.correctBoundaryConditions();
    }
 
    rho = thermo.rho(); // Here rho is calculated as p*psi = p/(R*T)
    rho.relax();
    auto uresidual = max(max(uresidual_v[0], uresidual_v[1]), uresidual_v[2]);
    residual = max(max(presidual, uresidual), eresidual);
    Info << "\nResidual: " << residual << endl << endl;
    turbulence->correct();
    csolve = csolve + 1;
    Info << "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
         << "  ClockTime = "   << runTime.elapsedClockTime() << " s"
         << nl << endl;
    saver++;
    std::cout << "saver ================== \t" << saver << std::endl;
 
    if (middleExport && saver == middleStep)
    {
        saver = 0;
        folderN++;
        ITHACAstream::exportSolution(U, name(folderN), folder + name(counter));
        ITHACAstream::exportSolution(p, name(folderN), folder + name(counter));
        ITHACAstream::exportSolution(E, name(folderN), folder + name(counter));
        auto nut = _mesh().lookupObject<volScalarField>("nut");
        ITHACAstream::exportSolution(nut, name(folderN), folder + name(counter));
        Ufield.append(U.clone());
        Pfield.append(p.clone());
        Efield.append(E.clone());
        nutFields.append(nut.clone());
        res_U << uresidual << std::endl;
        res_P << presidual << std::endl;
        res_E << eresidual << std::endl;
    }
}
 
snaps_os << folderN + 1 << std::endl;
//snaps_os << folderN  << std::endl;
iters << csolve << std::endl;
res_os << residual << std::endl;
cpuTimes << std::clock() - startOff << std::endl;
res_os.close();
res_U.close();
res_P.close();
snaps_os.close();
iters.close();
cpuTimes.close();
 
if (middleExport)
{
    ITHACAstream::exportSolution(U, name(folderN + 1), folder + name(counter));
    ITHACAstream::exportSolution(p, name(folderN + 1), folder + name(counter));
    ITHACAstream::exportSolution(E, name(folderN + 1), folder + name(counter));
    auto nut = _mesh().lookupObject<volScalarField>("nut");
    ITHACAstream::exportSolution(nut, name(folderN + 1), folder + name(counter));
}
else
{
    ITHACAstream::exportSolution(U, name(counter), folder);
    ITHACAstream::exportSolution(p, name(counter), folder);
    ITHACAstream::exportSolution(E, name(counter), folder);
    auto nut = _mesh().lookupObject<volScalarField>("nut");
    ITHACAstream::exportSolution(nut, name(counter), folder);
}
 
Ufield.append(U.clone());
Pfield.append(p.clone());
Efield.append(E.clone());
auto nut = _mesh().lookupObject<volScalarField>("nut");
nutFields.append(nut.clone());
 
// res_os << residual << std::endl;
// res_os.close();
runTime.setTime(runTime.startTime(), 0);