createFields.H

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    Info<< "Reading thermophysical properties\n" << endl;

    autoPtr<basicPsiThermo> pThermo
    (
        basicPsiThermo::New(mesh)
    );
    basicPsiThermo& thermo = pThermo();

    volScalarField& p = thermo.p();
    volScalarField& h = thermo.h();
    const volScalarField& psi = thermo.psi();

    volScalarField rho
    (
        IOobject
        (
            "rho",
            runTime.timeName(),
            mesh,
            IOobject::READ_IF_PRESENT,
            IOobject::AUTO_WRITE
        ),
        thermo.rho()
    );

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

    #include <finiteVolume/compressibleCreatePhi.H>

    dimensionedScalar pMin
    (
        mesh.solutionDict().subDict("PIMPLE").lookup("pMin")
    );

    Info<< "Creating turbulence model\n" << endl;
    autoPtr<compressible::turbulenceModel> turbulence
    (
        compressible::turbulenceModel::New
        (
            rho,
            U,
            phi,
            thermo
        )
    );

    //dimensionedScalar initialMass = fvc::domainIntegrate(rho);


    Info<< "Creating field DpDt\n" << endl;
    volScalarField DpDt =
        fvc::DDt(surfaceScalarField("phiU", phi/fvc::interpolate(rho)), p);

    MRFZones mrfZones(mesh);
    mrfZones.correctBoundaryVelocity(U);

    porousZones pZones(mesh);
    Switch pressureImplicitPorosity(false);