Lattice BGK simulations of the double diffusive mixed convection in an enclosure with different outlet locations

•This paper is related to the lattice BGK simulation for double diffusive mixed convection.•The effects of Lewis number, buoyancy ratio and outlet position are mainly discussed.•Different outlet positions mainly influence the isoconcentration distributions at the upper space above the heated cylinder.•Average Nusselt and Sherwood numbers are investigated per the changes of Lewis number and buoyancy ratio.