[me.ouda]

Dear All;

I have weird problem when I try to compile my solver. I have a some variables defined in creatFields.H, for example:

//Dispersed phase diameter
const dimensionedScalar& dd(mixture.dd());

//Turbulent Schmidt number
const dimensionedScalar& Sct(mixture.Sct());

Then I use those variables in another file, e.g. Ueqn.H

The problem is that when I try to compile the code it gives me the following warning:

./createFields.H: In function ‘int main(int, char**)’:
./createFields.H:140:26: warning: unused variable ‘dd’ [-Wunused-variable]
 const dimensionedScalar& dd(mixture.dd());
                          ^
./createFields.H:143:26: warning: unused variable ‘Sct’ [-Wunused-variable]
 const dimensionedScalar& Sct(mixture.Sct());

I am sure that the variables are used. When I comment the declaration of them I get a compilation error:

‘Sct’ was not declared in this scope
‘dd’ was not declared in this scope

And when I move the declaration from creatFields.H to the mySolver.C the problem disappear.

I just wonder why does this problem appear? and which variables should be declared in createFields.H and which should be declared directly in the solver source file?

Best regards

[blttkgl]

Hey,

I think it looks like you declare a reference but does not initialize it in your createFields.

I tested it like following with dummy variables and no warning messages: In createFields.H:

const scalarField& Sct = mesh.V();
const scalarField& vols = mesh.V();

then main solver:

#include "createFields.H"
scalarField test = vols + Sct;

Try initializing them at the same time you create them. Afterwards you can use them in your main file.

//Dispersed phase diameter
const dimensionedScalar& dd = mixture.dd();

//Turbulent Schmidt number
 const dimensionedScalar& Sct = mixture.Sct();

Bulut

[mkhm]

Did you find any solution to your problem ? I do have the same issue:
a warning about an unused variable. But I am 100% it is used.