A porous medium saturated with a gas is bounded by two impermeable planes. As the temperature of the lower side is increased, part of the porous matrix decomposes exothermically into gaseous products. A two dimensional model which couples the effects of this reaction to natural convection is solved numerically. At first, the reaction dominates the phenomena; the temperature and velocity components increase and a thermal front passes through the layer. As the reaction dies out due to a depletion of reactant, convective effects alone remain. Though this final state is well known, the density of the fluid is, here, allowed to vary and, furthermore, an ideal gas instead of an incompressible liquid is considered.

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