[Lighto]

Hello foamers,

I have a simple question (even though I'm struggling to find an answer...)

I want to assign a value coming from an Euler volume field to a lagrangian particle. The idea is that if a particle belongs to a cell where, from the solution of the Euler equation, there is a certain value of U, fvc::grad(U), and so on, that particle should have assigned that U, fvc::grad(U), etc...

I searched in the lagrangian libraries and I found that in the folder Intermediate > parcels > Templates > KinematicParcel there are some files that do that (for example) for the velocity U. I want to do the same for another scalar volume field that I have created on my own, but I didn't managed to do so.

I copied-paste all the lines that include U and replaced "U" with my scalar volume field "Stress" (also replaced "vector" with "scalar" when necessary). For example in file KinematicParcel.C I've added the lines

Stress_(p.Stress)

in the constructors.
In the file KinematicParcel.H (that is called at the very first lines of the file *.C) I've added

scalar Stress_

in the Parcel properties. In the same file, in access and edit sections

// Access
    [...]
    //- Return const access to scalar stress
    inline scalar Stress() const
    [...]

// Edit
    [...]
    //- Return access to scalar stress
    inline scalar& Stress()

Finally, to write a output file for Scalar I've also modified (with the same "phylosophy" above) the file KinematicParcelIO.H

But, when I try to compile with wmake all, the error is:

lnInclude/KinematicParcel.H:438:27: warning: inline function ‘Foam::scalar Foam::KinematicParcel<ParcelType>::Stress() const [with ParcelType = Foam::particle; Foam::scalar = double]’ used but never defined [enabled by default]
             inline scalar Stress() const;

I have already defined Scalar in the createFields.H file.

Any idea to fix that?

Regards,
Davide