Create GeometricField without IOobject

nadine

Hello,
sounds trivial, but how do I create a volScalarField, if I have a Field<double> and a volMesh?

Here mesh.Sf() and U are two volVectorFields from which the operator& calculates the inner product, a scalar field:
Field<double> Phi=mesh.Sf() & U;

But later I need a volScalarField with the values of Phi, and I see no possibility to construct this volScalarField although all geometric information is available.

The problem is that every GeometricField<...> constructor requires an IOobject, and every IOobject constructor requires a filename, so that GeometricFields can never be generated on the fly (unless copied from another GeometricField), but must always be read from a file.

Is this true?

N. Blanc