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Object inside PtrList does not update when its target does

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Old   January 14, 2020, 14:00
Default Object inside PtrList does not update when its target does
  #1
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Fabien Robaux
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Hello Foamers,
I need help on a PtrList object,
My goal is to create a solver that has the capabilities of interFoam with multiregion physics.



So I convert interFoam
Code:
   volScalarField& alpha1(mixture.alpha1());
To

Code:
    PtrList<volScalarField> l_alpha1(fluidRegions.size());
    l_alpha1.set
    (
        i,
        l_mixture[i].alpha1()
    );
The problem is, when I update l_mixture[i].alpha1()=something (modify the internal field),
The l_alpha1[i] does not update and both fields are thus different.

Reciprocally, when I modify l_alpha1[i], l_mixture[i].alpha1() is not updated.

Maybe I'm wrong, but I order to mimic the interFoam behavior, both fields are in fact one, and should behave as such?

Thank you a lot for your help
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Old   January 17, 2020, 14:03
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  #2
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Adhiraj
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Please correct me if I'm wrong, but from what I understand,

Code:
volScalarField& alpha1(mixture.alpha1());
creates a reference to the volScalarField returned by mixture.alpha1(), and thus if you change either, the other is updated.

When you write

Code:
l_alpha1.set
(
    i,
    l_mixture[i].alpha1()
);
you are initializing l_alpha1[i] using the "value" of the volScalarField returned by mixture.alpha1(). Thus they are not the same object.
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Old   January 21, 2020, 04:28
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  #3
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Fabien Robaux
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Quote:
Originally Posted by adhiraj View Post
When you write

Code:
l_alpha1.set
(
    i,
    l_mixture[i].alpha1()
);
you are initializing l_alpha1[i] using the "value" of the volScalarField returned by mixture.alpha1(). Thus they are not the same object.

Yes, This is what happens, but as l_alpha1 is a list of pointers (PtrList), I thought that l_alpha1[i] would point to the l_mixture[i].alpha1(). Maybe it is the normal behavior, but then I don't understand the name of the structure : "PtrList"...


Otherwise, is there a way to obtain l_alpha1[i] => l_mixture[i].alpha1().



Thanks a lot for your help!
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mixture, pointer, pointers, ptrlist

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