foam-extend4.1-coherent-io/applications/solvers/compressible/rhoPimpleFoam/createFields.H

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

    autoPtr<basicThermo> thermo
    (
        basicThermo::New(mesh)
    );

    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 "compressibleCreatePhi.H"

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

    Info<< "Creating turbulence model\n" << endl;
    autoPtr<compressible::RASModel> turbulence
    (
        compressible::RASModel::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);