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

TL;DR

This paper introduces a hybrid mesoscopic simulation approach combining lattice-Boltzmann and Monte Carlo methods to efficiently model two-phase gas flows with low pressure and concentration imbalance, relevant for modern industrial systems.

Contribution

The paper presents a novel hybrid simulation model that improves efficiency for low-pressure, two-phase gas flows with concentration disparities, integrating lattice-Boltzmann and Monte Carlo techniques.

Findings

The hybrid model accurately simulates diffusivity and diffusion advection systems.

It offers increased computational efficiency over classical methods.

The approach is suitable for low-pressure multiphase flow applications.

Abstract

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