The moving particle semi-implicit (MPS) method is extended into a multiphase MPS (MMPS) method, where multiphase fluids are modeled as a multi-viscosity and multi-density fluid. Interparticle viscosity and density are adopted to model the interaction between particles of different phases. However, such a straightforward extension is prone to instability because the light particles at the interface suffer from exceptionally high acceleration. Therefore, two approaches, MMPS-HD (harmonic density) and MMPS-CA (continuous acceleration), are proposed to suppress the instability. In the first approach, harmonic mean interparticle density is applied to discretize the multiphase pressure Poisson equation to avoid the exceptionally high acceleration at the interface. In the second approach, new MMPS formulations are derived from the locally weighted average of interaction acceleration between particles to guarantee the continuity of acceleration and velocity. The particle
A new kind of composite zeolite catalyst containing multi-functional reactive-sites located in different nanopores with individual shape-selectivity was successfully applied to two complex one-pot (including both sequential and parallel) reactions. Every kind of reactant molecule was exactly catalyzed only for its desired reaction, thus the reactive pathways were effectively controlled.
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