A numerical procedure for the calculation of buoyancy-driven flows using the finite-volume approach is presented. It is based on an extension of the operator-splitting procedure PISO of Issa [1] to the specific case in which the coupling between velocity/pressure and temperature is important, as is the case in problems involving free-convection flows. A comparison of the proposed procedure with a standard iterative method shows improvement both in terms of computing speed (a factor of 2.1 to 4.1) and robustness.
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P.J. Oliveira (2001) studied this question.
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