[gsabhishek]

surfaceScalarField rhoPhi
(
    IOobject
    (
        "rhoPhi",
runTime.timeName(),
mesh,
IOobject::NO_READ,
IOobject::NO_WRITE
    ),
fvc::interpolate(rho)*phi
);

Here in the attatched example, is "fvc::interpolate(rho)*phi" just an initializer or does it mean that rhoPhi get automatically updated as rho varies (something like a function)


thanks

[tomf]

Hi,

It means that rho (which is known at the cell centres) is interpolated to the face centers (where phi is known). Then they are multiplied to get rho*phi at the face centers. You now have the mass flux over the face of the cell.

Cheers,
Tom

[gsabhishek]

Hi,


Thanks for this... But what I am interested is in the general definition of the volScalarField or the surfaceScalarField. I want to know whether the function we are passing as an argument ( in this case "fvc::interpolate(rho)*phi"), is just to initialize the field or does openfoam use the function everytime rho is updated in the code

[einstein_zee]

Hey,

This is an object construction. And the constructor is called once, when the object is created. However, the content might change along the way...

[tomf]

Hi,

I guess this depends on when the function is called. It can typically be within the createFields.H, which is usually at the start of the simulation, so it is initialized, but it can also be within the time loop.

A volScalarField is a field (basically a list) of scalars, where each scalar is defined for a volume (i.e. in the cell center)
A surfaceScalarField is a field of scalars, where each scalar is defined for a surface (i.e. in the face center).

Cheers,
Tom