dnsFoam.C

Go to the documentation of this file.

/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Copyright (C) 2011-2023 OpenFOAM Foundation
     \\/     M anipulation  |
-------------------------------------------------------------------------------
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/>.
 
Application
    dnsFoam
 
Description
    Direct numerical simulation solver for boxes of isotropic turbulence.
 
\*---------------------------------------------------------------------------*/
 
#include "argList.H"
#include "timeSelector.H"
#include "Kmesh.H"
#include "UOprocess.H"
#include "fft.H"
#include "writeEk.H"
#include "writeFile.H"
 
#include "pisoControl.H"
#include "constrainPressure.H"
#include "constrainHbyA.H"
 
#include "fvcDdt.H"
#include "fvcGrad.H"
#include "fvcFlux.H"
 
#include "fvmDdt.H"
#include "fvmDiv.H"
#include "fvmLaplacian.H"
 
using namespace Foam;
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
int main(int argc, char *argv[])
{
    #include "postProcess.H"
 
    #include "setRootCase.H"
    #include "createTime.H"
    #include "createMeshNoClear.H"
    #include "createControl.H"
    #include "createFields.H"
    #include "initContinuityErrs.H"
 
    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
    Info<< nl << "Starting time loop" << endl;
 
    while (runTime.loop())
    {
        Info<< "Time = " << runTime.userTimeName() << nl << endl;
 
        force.primitiveFieldRef() = ReImSum
        (
            fft::reverseTransform
            (
                K/(mag(K) + 1.0e-6) ^ forceGen.newField(), K.nn()
            )
        );
 
        #include "globalProperties.H"
 
        fvVectorMatrix UEqn
        (
            fvm::ddt(U)
          + fvm::div(phi, U)
          - fvm::laplacian(nu, U)
         ==
            force
        );
 
        solve(UEqn == -fvc::grad(p));
 
 
        // --- PISO loop
        while (piso.correct())
        {
            volScalarField rAU(1.0/UEqn.A());
            surfaceScalarField rAUf("rAUf", fvc::interpolate(rAU));
            volVectorField HbyA(constrainHbyA(rAU*UEqn.H(), U, p));
            surfaceScalarField phiHbyA
            (
                "phiHbyA",
                fvc::flux(HbyA)
              + rAUf*fvc::ddtCorr(U, phi)
            );
 
            // Update the pressure BCs to ensure flux consistency
            constrainPressure(p, U, phiHbyA, rAUf);
 
            fvScalarMatrix pEqn
            (
                fvm::laplacian(rAUf, p) == fvc::div(phiHbyA)
            );
 
            pEqn.solve();
 
            phi = phiHbyA - pEqn.flux();
 
            #include "continuityErrs.H"
 
            U = HbyA - rAU*fvc::grad(p);
            U.correctBoundaryConditions();
        }
 
        runTime.write();
 
        if (runTime.writeTime())
        {
            writeEk(U, K);
        }
 
        Info<< "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
            << "  ClockTime = " << runTime.elapsedClockTime() << " s"
            << nl << endl;
    }
 
    Info<< "End\n" << endl;
 
    return 0;
}
 
 
// ************************************************************************* //