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How can I access to a volTensorField elements? urgent!!!

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Old   May 14, 2013, 04:34
Default How can I access to a volTensorField elements? urgent!!!
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Hi everybody,

I want to access to elements of a volTensorField. any body knows how can I do that?

thanks,
Mostafa
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Old   May 14, 2013, 06:27
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Hi Mostafa,

This is from the top of my head so don't know if it's fully correct but it might help you in the right direction. Sepose T is the name of the tensorField:
Code:
forAll(T,cellI)
{
    const Tensor& t = T[cellI];

    // The components:
    scalar txx = t.xx();
    scalar txy = t.xy();
    ...
}
Cheers,

L
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Old   May 14, 2013, 06:33
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thank you Lieven,

It's just for a Tensor not a volTensorField. I tried it before but it said that volTensorField has no member named ‘yy’.

again thank you.
Mostafa
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Old   May 14, 2013, 07:37
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Hi Mostafa,

I don't really understand your post. First you say that it's not a volTensorField but only a tensor, and next you say that the error states "volTensorField has no member named 'yy'". I hope you can see the contradiction in this and clarify it for me...

Cheers,

L
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Old   May 14, 2013, 08:31
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Quote:
Originally Posted by Lieven View Post
Hi Mostafa,

I don't really understand your post. First you say that it's not a volTensorField but only a tensor, and next you say that the error states "volTensorField has no member named 'yy'". I hope you can see the contradiction in this and clarify it for me...

Cheers,

L
pardon me Lieven,
I meant that what you said is applicable for Tensor type and when I used it for volTensorField it didn't work.

a question: what is the meaning of cellI in your post?
Code:
const Tensor& t=T[cellI]
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Old   May 14, 2013, 08:41
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That's why I put it inside the forAll-loop so that it would loop over each cell (hence the meaning of CellI).
Just found out that the easier way to get the whole field immediately is (e.g. for component xy):
Code:
scalarField Txy = T.component(tensor::XY);
Cheers,

L
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Old   May 14, 2013, 16:28
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A volTensorField is comprised of both internal values as well as boundary values assigned to patch faces.

I'm assuming you need to get to the internal field, this is how you do it:

Code:

       const tensorField& myTenF = myVolTensorField.internalField();


        forAll(myTenF,cellI)
        {
          tensor t = myTenF[cellI];
          scalar txx = t.xx();
          scalar txy = t.xy(); //etc...

         }
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