[rol97]

Hi everyone,

I am currently trying to access a dimensionedScalar from the coded bc, however I am a bit stuck.

Basically I am calculating the dimensionedScalar "myVar" within the solver, to then use it in the equations as a coefficient (so the value is never modified in the routine).

I also need such value in the BC, however I cannot access it through

db().lookupObject<dimensionedScalar>("myVar");

I have also tried to create the IOobject as

dimensionedScalar myVar
(
    IOobject
    (
        "myVar",
        runTime.constant(),
        mesh,
        IOobject::MUST_READ_IF_MODIFIED,
        IOobject::NO_WRITE
    ),
    mesh,
    dimensionedScalar("myVar", dimensionSet(0,2,0,0,0,0,0), Foam::scalar(0))
);

but it does not even compile, as no matching function is present.

Do you have any advice for me?

Thanks in advance.

[rol97]

Ok I have figured out this solution, which works fine for me. It is probably not the best option in terms of code optimization but here it is.

In the main code of the solver I evaluate my dimensionedScalar as:

dimensionedScalar A = <expression>;

Then I create the IOdictionary coeffsDict as:

IOdictionary coeffsDict
(
    IOobject
    (
        "coeffsDict",
        runTime.constant(),
        mesh,
        IOobject::NO_READ,
        IOobject::NO_WRITE
    )
);

where I store the value of the coefficients with:

coeffsDict.set( "a", A.value() );

At last, in the boundary conditions I get the value stored by means of:

dimensionedScalar A_
            (
                "A_",
                dimensionSet(0,2,0,0,0,0,0),
                db().lookupObject<IOdictionary>("coeffsDict").lookup("a")
            );

And here it is.

[olesen]

Originally Posted by rol97

Hi everyone,

I am currently trying to access a dimensionedScalar from the coded bc, however I am a bit stuck.

Basically I am calculating the dimensionedScalar "myVar" within the solver, to then use it in the equations as a coefficient (so the value is never modified in the routine).

I also need such value in the BC, however I cannot access it through

db().lookupObject<dimensionedScalar>("myVar");

I have also tried to create the IOobject as

dimensionedScalar myVar
(
    IOobject
    (
        "myVar",
        runTime.constant(),
        mesh,
        IOobject::MUST_READ_IF_MODIFIED,
        IOobject::NO_WRITE
    ),
    mesh,
    dimensionedScalar("myVar", dimensionSet(0,2,0,0,0,0,0), Foam::scalar(0))
);

but it does not even compile, as no matching function is present.

Do you have any advice for me?

Thanks in advance.

That will not work. All registered items must derive from a regIOobject. The closest you can have would be a UniformDimensionedField.