[toboto]

Dear All,

I have some questions and I would appreciate if someone help me.

Q1: I am a little bit confused about the difference between volField and it's associated internalField. I can't see any difference although many claims that there is (I think that should be the case).

In the GeometricField.H we can find the definition of the interalField as

   39 Foam::GeometricField<Type, PatchField, GeoMesh>::Internal&
   40 Foam::GeometricField<Type, PatchField, GeoMesh>::
   41 internalField() const
   42 {
   43     return *this;
   44 }

Also I made a small test to get some attribute of those two fields as follows:

volVectorField U
(
IOobject
(
"U",
runTime.timeName(),
mesh,
IOobject::MUST_READ,
IOobject::AUTO_WRITE
),
mesh
);
Info << U.size() << endl;
Info <<U.internalField().size() << endl;
Info << typeid(U).name() << endl;
Info << typeid(U.internalField()).name() << endl;

and the output was

58539
58539
N4Foam14GeometricFieldINS_6VectorIdEENS_12fvPatchFieldENS_7volMeshEEE
N4Foam14GeometricFieldINS_6VectorIdEENS_12fvPatchFieldENS_7volMeshEEE

I.e. the same type and the same size. Also if I print them I get the same values where U.internalField() also contain the boundary information.

So may someone elaborate a little bit on the difference between them.

Q2: where does GeoMesh class reside in the mesh heirarchy in OpenFoam or simply what is the relation between GeoMesh and fvMesh. I tried to find that by looking into the cpp docs but I caouldn't figure out.

Q3: What is the difference/relation between GeometricField and DimensionedField?

Best regards.