An accurate equation of state (EOS) for carbon dioxide is coupled into an improved lattice Boltzmann equation (LBE) model. With the model continuous interfacial dynamics of carbon dioxide in two phase in a microchannel, including breaking up, coalescence, deformation, and mass exchange between gas and liquid phases, is studied. It is found that flows achieve a steady-state as balance of breaking up and coalescence is reached, and mass exchange occurs. Comprehensive results show that flow shape at steady-state depends mainly on surface tension, inertial force, wettability of channel surface, and initial volume fraction. Specially, formative bubbles or droplets are almost spherical as inertial force is smaller than surface tension. As surface tension overcomes inertial force, slug flow is formed since bubbles or droplets are easy to expand to contact with solid surface. On the other hand, it shows that influence of wettability on flow pattern is also important. Slug flow is observed if contact angle is small while annular flow is observed if contact angel is large. At different volume fraction slug flow and annular flow are obtained.

Liquid metal flow subject to a uniform magnetic field vertical to streamwise direction confined in a rectangular duct with 45° and 90° sudden expansion, and electrically conducting walls is numerically studied using magnetohydrodynamic (MHD) flow solver developed in OpenFOAM environment. Velocity distribution, induced electric current, pressure gradient and three-dimensional MHD effect are analyzed in detail. It shows that as external magnetic field is parallel to direction of duct expansion, velocity distribution is better in 45° sudden expansion duct than that in 90° expansion duct since there is no vortex at the expansion. With Hartmann number increasing, high velocity jets and intensive induced electric current cause a strong instability at the expansion. Instability grows to upstream of the expansion through induced electric current. As external magnetic field is vertical to expansion direction, induced electric current along streamwise direction is significant. With Hartmann number increasing, MHD pressure drop increases remarkably. Dimensionless pressure drop in fully developed duct is almost the same in different expansion duct as direction of applied magnetic field and Hartmann number are the same.

An LB-based gas-solid two-phase model with two-way coupling is developed considering feedback forcing of particles in evolution equation of fluid particles. Smagorinsky subgrid model is also introduced in simulation of flow field with high Reynolds numbers. Classic particle-laden flow over a backward facing step is simulated and velocity profiles of gas phase and particles (considering one-way coupling and two-way coupling respectively) are compared with experimental results. The results of two-way coupling LB model are obviously better than these of one-way coupling LB model. Furthermore, preferential concentration of particles with different Stokes numbers (St) is investigated. It is found that small particles (St~0(0.1)) show better following behaviors with gas phase and are uniformly distributed in the flow field. Particles with moderate Stokes numbers (St~0(1)) are hard to be entrained into the vortex and show strong preferential concentration. On the other hand, large particles (St~0(10)) can enter into the vortex because of great inertial and are distributed more uniformly in flow field.

Supersonic flow characteristics of a dispenser with oponed cabin are numerically simulated with Reynolds-averaged Navier-Stokes equations.Computations are well consistent with experimental results.Flow characteristics are simulated well with S-A turbulent model and splitting scheme AUSM+.If attack angle is not zero,reverse flow is found at backward-facing step of head.Vortices are developed between adjacent submunitions.Several extremes of surface circumferential pressure are shown,and shell tail wave is not symmetric.The principle of flow field is revealed.Vital reference is provided for submunition initial conditions.