Lattice Boltzmann accelerated direct simulation Monte Carlo for dilute gas flow simulations

Research output: Contribution to journalArticleAcademicpeer-review

9 Citations (Scopus)
2 Downloads (Pure)

Abstract

Hybrid particle–continuum computational frameworks permit the simulation of gas flows by locally adjusting the resolution to the degree of non-equilibrium displayed by the flow in different regions of space and time. In this work, we present a new scheme that couples the direct simulation Monte Carlo (DSMC) with the lattice Boltzmann (LB) method in the limit of isothermal flows. The former handles strong non-equilibrium effects, as they typically occur in the vicinity of solid boundaries, whereas the latter is in charge of the bulk flow, where non-equilibrium can be dealt with perturbatively, i.e. according to Navier–Stokes hydrodynamics. The proposed concurrent multiscale method is applied to the dilute gas Couette flow, showing major computational gains when compared with the full DSMC scenarios. In addition, it is shown that the coupling with LB in the bulk flow can speed up the DSMC treatment of the Knudsen layer with respect to the full DSMC case. In other words, LB acts as a DSMC accelerator.

This article is part of the themed issue ‘Multiscale modelling at the physics–chemistry–biology interface’
Original languageEnglish
Article number20160226
Pages (from-to)1-11
Number of pages11
JournalPhilosophical Transactions of the Royal Society of London, Series A: Mathematical, Physical and Engineering Sciences
Volume374
Issue number2080
DOIs
Publication statusPublished - 3 Oct 2016

Fingerprint Dive into the research topics of 'Lattice Boltzmann accelerated direct simulation Monte Carlo for dilute gas flow simulations'. Together they form a unique fingerprint.

  • Cite this