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Many modern production and measurement facilities incorporate multiphasesystems at low pressures. In this region of flows at small, non-zero Knudsen-and low Mach numbers the classical mesoscopic Monte Carlo methods becomeincreasingly numerically costly. To increase the numerical efficiency ofsimulations hybrid models are promising. In this contribution, we propose anovel efficient simulation approach for the simulation of two phase flows witha large concentration imbalance in a low pressure environment in the lowintermediate Knudsen regime. Our hybrid model comprises a lattice-Boltzmannmethod corrected for the lower intermediate Kn regime proposed by Zhang et al.for the simulation of an ambient flow field. A coupled event-drivenMonte-Carlo-style Boltzmann solver is employed to describe particles of asecond species of low concentration. In order to evaluate the model, standarddiffusivity and diffusion advection systems are considered.

Mesoscopic simulation of diffusive contaminant spreading in gas flows at low pressure