[maybee]

Hi,

I am working with the multiphaseEulerFoam and I recognized that sometimes fields are initialized like

volScalarField p
    (
        IOobject
        (
            "p",
            runTime.timeName(),
            mesh,
            IOobject::MUST_READ,
            IOobject::AUTO_WRITE
        ),
        mesh
    );

without getting dimensions. On the other hand some fields are initialized like

volVectorField U
    (
        IOobject
        (
            "U",
            runTime.timeName(),
            mesh,
            IOobject::NO_READ,
            IOobject::AUTO_WRITE
        ),
        mesh,
        dimensionedVector("U", dimVelocity, vector::zero)
    );

Should I initialize fields generally with a dimensioned type especially when using them for calculations or should I initialize fields without any dimension type (-> are they dimless then?) ?