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

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


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

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

    volScalarField psi
    (
        IOobject
        (
            "psi",
            runTime.timeName(),
            mesh,
            IOobject::NO_READ,
            IOobject::NO_WRITE
        ),
        1.0/(R*T)
    );
    psi.oldTime();

    volScalarField rho
    (
        IOobject
        (
            "rho",
            runTime.timeName(),
            mesh
        ),
        psi*p,
        p.boundaryField().types()
    );

    volVectorField rhoU
    (
        IOobject
        (
            "rhoU",
            runTime.timeName(),
            mesh,
            IOobject::NO_READ,
            IOobject::NO_WRITE
        ),
        rho*U,
        U.boundaryField().types()
    );

    volScalarField rhoE
    (
        IOobject
        (
            "rhoE",
            runTime.timeName(),
            mesh,
            IOobject::NO_READ,
            IOobject::NO_WRITE
        ),
        rho*Cv*T + 0.5*rho*magSqr(rhoU/rho),
        T.boundaryField().types()
    );