foam-extend4.1-coherent-io/applications/solvers/surfaceTracking/bubbleInterTrackFoam/createFields.H

Info<< "\nReading field p\n" << endl << flush;
volScalarField p
(
    IOobject
    (
        "p",
        runTime.timeName(),
        mesh,
        IOobject::MUST_READ,
        IOobject::AUTO_WRITE
    ),
    mesh
);


Info<< "Reading field U\n" << endl << flush;
volVectorField U
(
    IOobject
    (
        "U",
        runTime.timeName(),
        mesh,
        IOobject::MUST_READ,
        IOobject::AUTO_WRITE
    ),
    mesh
);


#   include "createPhi.H"


volScalarField rho
(
    IOobject
    (
        "rho",
        runTime.timeName(),
        mesh,
        IOobject::NO_READ,
        IOobject::NO_WRITE
    ),
    mesh,
    dimensionedScalar("0", dimMass/dimVolume, 0)
);


freeSurface interface(mesh, rho, U, p, phi);


volScalarField* fluidIndicatorPtr = nullptr;

if(Pstream::parRun())
{
    fluidIndicatorPtr = new volScalarField
    (
        IOobject
        (
            "fluidIndicator",
            runTime.timeName(),
            mesh,
            IOobject::MUST_READ,
            IOobject::AUTO_WRITE
        ),
        mesh
    );
}
else
{
    fluidIndicatorPtr = new volScalarField
    (
        IOobject
        (
            "fluidIndicator",
            runTime.timeName(),
            mesh,
            IOobject::NO_READ,
            IOobject::NO_WRITE
        ),
        interface.fluidIndicator()
    );
}

volScalarField& fluidIndicator = *fluidIndicatorPtr;


rho = fluidIndicator
   *(
        interface.rhoFluidA()
      - interface.rhoFluidB()
    )
  + interface.rhoFluidB();


volScalarField mu
(
    IOobject
    (
        "mu",
        runTime.timeName(),
        mesh,
        IOobject::NO_READ,
        IOobject::NO_WRITE
    ),
    fluidIndicator
   *(
        interface.muFluidA()
      - interface.muFluidB()
    )
  + interface.muFluidB()
);


// Read interpolators if present
if (interface.twoFluids())
{
    interface.interpolatorAB();
}


#   include "setRefCell.H"

mesh.schemesDict().setFluxRequired(p.name());