[deji]

I would like to write out a temporary volScalarField object:
virtual tmp<volScalarField> alphaEff

during simulation. Is this possible to do in OpenFOAM somehow?

Best regards
Deji

[l_r_mcglashan]

Why make it temporary if you want to write it out?

And I've never seen a virtual variable before.

However, I see what you're getting at. You can use .write() to write that object to file at any point in a simulation. Or you can create an IOobject with AUTO_WRITE, and assign alphaEff to it. Then it will be output every writeInterval (in controlDict).

[olesen]

Originally Posted by l_r_mcglashan

Why make it temporary if you want to write it out?

And I've never seen a virtual variable before.

I think he's referring to the method itself, which is virtual and which returns a tmp<volScalarField>.

[olesen]

Originally Posted by deji

I would like to write out a temporary volScalarField object:
virtual tmp<volScalarField> alphaEff

during simulation. Is this possible to do in OpenFOAM somehow?

No problem, just use the write() method but note that this method belongs to the underlying class and not to tmp<> itself.

Since the alphaEff method returns a tmp<volScalarField> you'll either need to dereference it, or create a volScalarField from it.

Option 1 (not particularly elegant), create a volScalarField:

{
   volScalarField alphaEff = turb.alphaEff();
   alphaEff.write();
}

Option 2, using a dereferenced tmp:

{
   tmp<volScalarField> talphaEff = turb.alphaEff();
   talphaEff().write();
}

Option 3 is the most succinct and also uses a dereferenced tmp but without an intermediate variable. This is what I'd use.

   turb.alphaEff()().write();

I hope this helps.

[l_r_mcglashan]

Although you may not want to write out the file evey time step. Perhaps enclose it in this?

if(runTime.outputTime())
{
     turb.alphaEff()().write(); 
}

[deji]

Thank you very much guys. I will try your suggestions in my computation.

Best regards
Deji

[saba_saeb]

Anyone happen to know how I can output nuTilda field calculated in SpalartAllmaras model?

Cheers,
Saba