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-   -   Divergence (http://www.cfd-online.com/Forums/openfoam-solving/85218-divergence.html)

aPostrophic February 20, 2011 08:37

Divergence
 
Could anybody tell me what die fvm::div(phi,U) scheme is doing in OpenFoam?



Is div(-phi,U) the same as -div(phi,U) ?

akidess February 21, 2011 07:56

I suggest having a look at the Programmers Guide (P-38ff).

aPostrophic February 21, 2011 09:38

I read it already, but it does not help me.
According to the Programmers Guide -fvm::div(phi,U) und fvm::div(-phi,U)
should make no difference, but in my case it does.

eugene April 5, 2011 20:13

It depends on what convection scheme you are using. If it is symmetric (linear or harmonic) it shouldn't make a difference. If it is upwind or downwind biased, adding the minus will obviously switch the bias direction to the other cell bordering the face.


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