Multiple-relaxation-time lattice Boltzmann model for double-diffusive convection with Dufour and Soret effects

This paper proposes a multiple-relaxation-time (MRT) lattice Boltzmann (LB) model for double-diffusive convection with Dufour and Soret (cross-diffusion) effects. The main strategy is to recover the Dufour and Soret terms by modifying the second-order equilibrium moments of the temperature and concentration distribution functions in the moment space, which is consistent with the philosophy of the LB method. As a result of this strategy, the present model is simpler and easier to implement when compared with the existing LB models. Numerical simulations show that double-diffusive convection with Dufour and Soret effects can be well simulated. (C) 2019 Elsevier Ltd. All rights reserved.