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What is the application of fvc::absolute(phi/fvc::interpolate(rho), U)

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Old   April 1, 2015, 22:10
Default What is the application of fvc::absolute(phi/fvc::interpolate(rho), U)
james wilson
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In buoyantPimpleFoamSolver a few lines in EEqn.H read:

                fvc::absolute(phi/fvc::interpolate(rho), U),
I understand dividing by the interpolated surfaceScalarField rhof to get the volume flux for the divergence operator but why didn't we stop there?

For example:

fvc::div(phi/fvc::interpolate(rho),p) .... (1)

In other words, what is the provided code doing that cannot be accomplished by (1)? Or, what is the purpose of fvc::absolute() (what are it's arguments and it's output)?

Also, I suppose providing "div(phiv,p)" in the argument of fvc::div() in the solver gives a name to reference in fvSchemes? I have a question in another post related to this issue:

Thanks, James
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Old   April 2, 2015, 08:29
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Alexey Matveichev
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1. fvc::absolute does nothing for static mesh, see

2. as surfaceScalarField fvc::absolute(phi/fvc::interpolate(rho), U) has rather fancy name it is necessary explicitly set the name of operation, so fvc::div can decide what scheme to use for discretization.
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buoyantpimplefoam, energy equation, fvc::absolute

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