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Forum: OpenFOAM Programming & Development

January 7, 2011, 12:44

Replies: 33

phi -= pEqn.flux() vs. linearInterpolate(U) & mesh.Sf()

Views: 26,498

Posted By alberto

I have seen the approximation (a*b)_f = a_f*b_f...

I have seen the approximation (a*b)_f = a_f*b_f used quite often in Issa papers (I have in mind a paper on multiphase flows (Oliveira & Issa, 2003, Int. J. Num. Meth. Fluids), but also elsewhere),...

Forum: OpenFOAM Programming & Development

January 7, 2011, 11:35

Replies: 33

phi -= pEqn.flux() vs. linearInterpolate(U) & mesh.Sf()

Views: 26,498

Posted By alberto

I agree. Additionally, notice that OpenFOAM and...

I agree. Additionally, notice that OpenFOAM and many papers in the literature make the assumption

(a*b*c)_f = a_f * b_f * c_f

This is not true in general, and it holds only for a smooth...

Forum: OpenFOAM Programming & Development

January 7, 2011, 11:23

Replies: 33

phi -= pEqn.flux() vs. linearInterpolate(U) & mesh.Sf()

Views: 26,498

Posted By alberto

Because a) enforces the mass conservation...

Because a) enforces the mass conservation principle, while the second does not. Remember that the pressure equation is assembled with the face fluxes, and the flux is the conservative variable, not...

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