OpenFOAM-2.4.x/applications/solvers/basic/potentialFoam/potentialFoam.C

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    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
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License
    This file is part of OpenFOAM.

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    under the terms of the GNU General Public License as published by
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Application
    potentialFoam

Description
    Potential flow solver which solves for the velocity potential
    from which the flux-field is obtained and velocity field by reconstructing
    the flux.

    This application is particularly useful to generate starting fields for
    Navier-Stokes codes.

\*---------------------------------------------------------------------------*/

#include "fvCFD.H"
#include "fvIOoptionList.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

int main(int argc, char *argv[])
{
    argList::addOption
    (
        "pName",
        "pName",
        "Name of the pressure field"
    );

    argList::addBoolOption
    (
        "initialiseUBCs",
        "Initialise U boundary conditions"
    );

    argList::addBoolOption
    (
        "writePhi",
        "Write the velocity potential field"
    );

    argList::addBoolOption
    (
        "writep",
        "Calculate and write the pressure field"
    );

    argList::addBoolOption
    (
        "withFunctionObjects",
        "execute functionObjects"
    );

    #include "setRootCase.H"
    #include "createTime.H"
    #include "createMesh.H"
    #include "readControls.H"
    #include "createFields.H"
    #include "createFvOptions.H"

    // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

    Info<< nl << "Calculating potential flow" << endl;

    // Since solver contains no time loop it would never execute
    // function objects so do it ourselves
    runTime.functionObjects().start();

    fvOptions.makeRelative(phi);

    adjustPhi(phi, U, p);

    // Non-orthogonal velocity potential corrector loop
    for (int nonOrth=0; nonOrth<=nNonOrthCorr; nonOrth++)
    {
        fvScalarMatrix PhiEqn
        (
            fvm::laplacian(dimensionedScalar("1", dimless, 1), Phi)
         ==
            fvc::div(phi)
        );

        PhiEqn.setReference(PhiRefCell, PhiRefValue);
        PhiEqn.solve();

        if (nonOrth == nNonOrthCorr)
        {
            phi -= PhiEqn.flux();
        }
    }

    fvOptions.makeAbsolute(phi);

    Info<< "Continuity error = "
        << mag(fvc::div(phi))().weightedAverage(mesh.V()).value()
        << endl;

    U = fvc::reconstruct(phi);
    U.correctBoundaryConditions();

    Info<< "Interpolated velocity error = "
        << (sqrt(sum(sqr((fvc::interpolate(U) & mesh.Sf()) - phi)))
          /sum(mesh.magSf())).value()
        << endl;

    // Write U and phi
    U.write();
    phi.write();

    // Optionally write Phi
    if (args.optionFound("writePhi"))
    {
        Phi.write();
    }

    // Calculate the pressure field
    if (args.optionFound("writep"))
    {
        Info<< nl << "Calculating approximate pressure field" << endl;

        label pRefCell = 0;
        scalar pRefValue = 0.0;
        setRefCell
        (
            p,
            potentialFlow,
            pRefCell,
            pRefValue
        );

        // Calculate the flow-direction filter tensor
        volScalarField magSqrU(magSqr(U));
        volSymmTensorField F(sqr(U)/(magSqrU + SMALL*average(magSqrU)));

        // Calculate the divergence of the flow-direction filtered div(U*U)
        // Filtering with the flow-direction generates a more reasonable
        // pressure distribution in regions of high velocity gradient in the
        // direction of the flow
        volScalarField divDivUU
        (
            fvc::div
            (
                F & fvc::div(phi, U),
                "div(div(phi,U))"
            )
        );

        // Solve a Poisson equation for the approximate pressure
        for (int nonOrth=0; nonOrth<=nNonOrthCorr; nonOrth++)
        {
            fvScalarMatrix pEqn
            (
                fvm::laplacian(p) + divDivUU
            );

            pEqn.setReference(pRefCell, pRefValue);
            pEqn.solve();
        }

        p.write();
    }

    runTime.functionObjects().end();

    Info<< "ExecutionTime = " << runTime.elapsedCpuTime() << " s"
        << "  ClockTime = " << runTime.elapsedClockTime() << " s"
        << nl << endl;

    Info<< "End\n" << endl;

    return 0;
}


// ************************************************************************* //