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Diagonal elements of a volTensorField

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Old   September 22, 2010, 05:47
Default Diagonal elements of a volTensorField
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Dear All,

I need to compute the diagonal elements of a volTensorField. The tensor field has the form,

volTensorField tmp ("tmp", fvc::grad(U));

It seems OpenFoam 1.6 doesn't have a function like diag(tmp). Does OpenFoam 1.7 have such kinds of function? Do any people know how to compute the diagonal elements?

Many thanks,
Y. J.
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Old   September 23, 2010, 11:06
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Eugene de Villiers
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If you want the sum of the diagonal elements then:

volScalarField trTmp = tr(tmp);

If you just want the diagonal components, then


will provide the individual fields.
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