[zikou55]

Hello, I want to define new variable in the solver
F=U.component(1)*beta; //beta is an constant

but I got an error

error: no match for ‘operator=’ (operand types are ‘Foam::volScalarField {aka Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>}’ and ‘Foam::tmp<Foam::GeometricField<Foam::Vector<doubl e>, Foam::fvPatchField, Foam::volMesh> >’)
F=U.component(1)*beta;

please any help or suggestion and Thank you .

[Tobi]

Please provide more information. Which class type is your object F? Is your usage of U.component(1) correct?

Based on Doxygen you do have a volVectorField for the velocity which is a GeometricField (Template Class) while the Type of the template is Vector. Hence, you should get access as given below:

// F has to be a volScalarField with appropriate units
F = U.y() * dimensionedScalar()

[zikou55]

Thank you very much .
the problem resolved