In this talk, we will first present a diffuse-interface model for gas-liquid-solid multiphase flows with chemical reaction where a novel free energy is proposed for the gas-liquid-solid three-phase system. Furthermore, a smooth indicator function for the solid phase is also introduced into the Navier-Stokes equations and convection-diffusion equations to preserve the velocity and reactive boundary conditions on the solid surface. Based on the developed diffuse-interface model, the fluid interface dynamics, the fluid-structure interaction, the wetting property of the solid surface and heterogeneous reaction can be described simply and efficiently. To test the present diffuse-interface model, we then develop a lattice Boltzmann method and conduct some simulations of bechmark problems, and the numerical results show that the diffuse-interface lattice Boltzmann method has a good performance in the study of multiphase reactive flows.

Diffuse-interface model,lattice Boltzmann method,multiphase fluids,chemical reaction