[shock77]

Hi,


I am trying to create a new IOobject (Reynoldsnumber). Therefore I have added the following lines in my createFields.H and compiled it without errors. Unfortunately only a const value is returned (for Re and nu):

volScalarField nu
    (
    IOobject
        (
            "nu",
            runTime.timeName(),
            mesh,
            IOobject::NO_READ,
            IOobject::AUTO_WRITE
        ),
         thermo.mu()/rho
     );


volScalarField L
(
    IOobject
    (
        "L",
        runTime.timeName(),
        mesh,
        IOobject::NO_READ,
        IOobject::AUTO_WRITE
    ),
    mesh,dimensionedScalar("L", dimensionSet(0,1,0,0,0,0,0),1 )
);

    volScalarField Re
    (
    IOobject
        (
            "Re",
            runTime.timeName(),
            mesh,
            IOobject::NO_READ,
            IOobject::AUTO_WRITE
           
        ),
         mag(U)*0.00095*L/nu
     );

Any idea what I am doing wrong?

[Wenyuan]

Hi,

You need to update such volScalarFields in the time loop. Otherwise, they will always take the initial values defined in createFields.H.

[shock77]

Thank you very much, it seems to work now!


As you said, I have added the lines in the time loop of my solver:

nu = thermo.mu()/rho;
L = dimensionedScalar("L", dimensionSet(0,1,0,0,0,0,0),1 );
Re = mag(U)*0.00095*L/nu;