Author(s)

G. Comini & C. Nonino

Abstract

The outflow boundary condition for mixed convection problems G. Comini & C. Nonino Dipartimento di Energetica e Macchine - Universitd di Udine Wa dW/e iSWffzze 20& - jJ700 Email :Gianni. Comini@uniud. it Abstract The appropriate modelling of outflow boundary conditions in mixed convec- tion flows with strong buoyancy effects, is a very challenging task. In this paper, "advective boundary conditions" are employed in the context of a recently proposed formulation based on primitive variables. The accuracy of the approach is demonstrated by the solution of a traditional benchmark problem: the two-dimensional Poiseuille-Benard flow in a horizontal channel heated from below. 1 Introduction The biggest difficulty in the specification of outflow boundary conditions is brought about by the necessity of truncating the computational domain in order to make the problem tractable. When strong buoyancy effects are present, the task is so challenging that the Poiseuil

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