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This example studies the stationary state of free convection in a cavity filled with water and bounded by two vertical plates. To generate the buoyancy flow, the plates are heated at different temperatures, bringing the regime close to the transition between laminar and turbulent. To prepare the model, an estimation of the flow regime is performed using the Reynolds, Grashof, Rayleigh and Prandtl numbers. This discussion is completed by a description of some meshing and convergence issues.