# Divergence of a scalarField in two forms

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 August 23, 2016, 08:17 Divergence of a scalarField in two forms #1 Member   Rohith Join Date: Oct 2012 Location: Germany Posts: 57 Rep Power: 6 Hi All, I am a little enthusiastic to know about the difference between these convective terms Code: `cp*fvm::(phi, T)` Code: `fvm::(phi, cp*T)` Using pen and paper the product seems to be equal In the first case the divergence of a surfaceScalarField, phi and a volScalarField, T is a scalarField which is multiplied by a ScalarField cp resulting in a ScalarField. In the second case the product of two scalarFields cp and T is a volScalarfield. The divergence of the volScalarField obtained through product and a surfaceScalarField phi is a ScalarField. Can somebody tell me the strong difference between these two notations. Thanking you in Advance, Best Regards, Rohith Last edited by RaghavendraRohith; August 23, 2016 at 10:45.

 August 23, 2016, 10:34 #2 Senior Member   Join Date: Sep 2013 Posts: 116 Rep Power: 6 You should check that again For a scalar s and a vector v: div(s*v) = s*div(v)+v & grad(s) Hence it is only equal if cp is a constant scalar.

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