The onset of convection due to wave propagation is investigated in the fram
ework of the Belousov-Zhabotinsky reaction. Numerical calculations are base
d on a three variable Oregonator model coupled with the Navier-Stokes hydro
dynamic equations under the Boussineq approximation for a system consisting
of two layers, a liquid and a gel, both in close contact through an interf
ace where chemical concentration exchange is allowed. The influence on the
formation of convective rolls associated to wave front propagation is studi
ed in terms of the exchange rate through the interface, the liquid layer wi
dth, and the coupling strength between the fluid flow and chemical dynamics
. Waves are initiated on the surface of the gel and this perturbation is al
lowed to propagate into the liquid initiating either two counterrotating co
nvective cells (at both sides of the front) or a disordered pattern.