Employing per-component time step in DSMC simulations of disparate mass and cross-section gas mixtures

TL;DR

This paper introduces a novel per-component time step method in DSMC simulations to efficiently model gas mixtures with disparate masses and cross-sections, reducing computational demands in vacuum deposition scenarios.

Contribution

The paper proposes a new approach that assigns individual time steps to each gas component, improving simulation efficiency for complex gas mixtures with disparate molecular properties.

Findings

Reduced computational resources for simulating disparate gas mixtures

Successful demonstration on silver nanocluster diffusion in argon

Modified collision phase enhances simulation accuracy

Abstract

A new approach to simulation of stationary flows by Direct Simulation Monte Carlo method is proposed. The idea is to specify an individual time step for each component of a gas mixture. The approach consists of modifications mainly to collision phase and recommendation on choosing time step ratios. It allows softening the demands on the computational resources for cases of disparate collision diameters of molecules and/or disparate molecular masses. These are the cases important in vacuum deposition technologies. Few tests of the new approach are made. Finally, the usage of new approach is demonstrated on a problem of silver nanocluster diffusion in carrier gas argon in conditions of silver deposition experiments.