The combined effect of different initial conditions types and variation of Rayleigh number on thermosolutal convection characteristics is numerically investigated in a horizontal annulus filled with a porous medium saturated by a binary fluid. The control parameters, radius ratio, R = 1.2, Lewis number Le = 2 and cooperating buoyancy forces, N = 2, are considered in this investigation. Darcy's equation, conservation of the energy and species concentration equations are solved with the Alternating Direction Implicit (ADI) scheme, based on the Centered Finite Difference discretization. The steady-state numerical results using three types of initial conditions show that different multicellular flow patterns are obtained with increasing the Rayleigh number. The average Nusselt and Sherwood numbers behaviors are also discussed.
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