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help needed with fvc::div()

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Old   August 31, 2009, 03:54
Question help needed with fvc::div()
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Johanna Airaksinen
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I have tried to do an equation that is solved using fvScalarMatrix. One of the terms in this equation is (Ua+Ub)div(kab),
where Ua and Ub are volVectorField and kab is volScalarField and also the unknown of this equation.

I have tried to do this term by using the following
(Ua+Ub) & fvc::div(kab) in the fvScalarMatrix.

I also tried to do this fvc::div(kab) outside the ScalarMatrix to see if it works that way. I get an error message.
"createFields.H:332: error: no matching function for call to 'div(Foam::volScalarField&)' "

Could someone help me and tell me what I'm doing wrong? I don't have a lot of experience with OpenFoam yet.
There are similar equations in my code, that work just fine, but in those the divergence term is normal.

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Old   August 31, 2009, 04:36
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Niklas Nordin
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divergence of a scalar!!!
The error message cant be much clearer.

divergence works on vectors...returns a scalar.
grad works on scalars....returns a vector
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Old   August 31, 2009, 07:12
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Johanna Airaksinen
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I have been laughing at myself here when I read your reply.

Thanks!
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