Boltzmann equation 1 Boussinesq approximation 1 Boussinesq approximations 1 Convective heat transfer 1 Curvilinear coordinate 1 Curvilinear coordinates 1 Curvilinear lattice 1 Double distribution Double-distribution method 1 Heat convection 1 Lattice-Boltzmann scheme 1 Low dissipations 1 Property 1 Thermal flows 1