[CharIie]

I am working in OpenFoamV8 with buoyantPimpleFoam. I have created a new variable "Test" in the solver code. Test should be the sum of the current temperature and a user defined constant value "Tc". My solver compiles and I get results, but the variable Test does not change over time!

Only the first time step "Test" is calculated and stays constant for all time steps. Although T changes over time! How can that be?

The error must be in the following code:
I have added these lines to Ueqn.H:

const volScalarField& T = mesh.lookupObject<volScalarField>("T");
dimensionedScalar    Tc(magneticProperties.lookup("Tc"));
volScalarField Test = T + Tc;

Test and Tc are created in createFields.H like this:

Info<< "Reading magnetic properties\n" << endl;
IOdictionary magneticProperties
(
    IOobject
    (
        "magneticProperties",
        runTime.constant(),
        mesh,
        IOobject::MUST_READ_IF_MODIFIED,
        IOobject::NO_WRITE
    )
);
dimensionedScalar Tc(magneticProperties.lookup("Tc"));



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