A new heterogeneous multiscale technique for microscale gas flows

Stephanie Y. Docherty*, Matthew K. Borg, Duncan A. Lockerby, Jason M. Reese

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We present a new hybrid method for dilute gas flows that heterogeneously couples a continuum-fluid description to the direct simulation Monte Carlo (DSMC) method. A continuum-fluid model is applied across the entire domain, while DSMC is applied in spatially-distributed micro regions. Using a field-wise coupling approach, DSMC sub-domains of any size can be placed at any location. The sub-domain arrangement can therefore be adjusted for each problem to capture non-equilibrium behaviour both close to bounding walls and in the bulk. We demonstrate our method on a test case of high-speed micro Couette flow. With large differences in wall velocity, significant viscous heating is present, and so our coupling considers the transfer of both momentum and heat. Our hybrid results are validated against a pure DSMC simulation, and the results show that the method can deal with missing boundary and constitutive information.
Original languageEnglish
Title of host publicationProceedings of the 4th Micro and Nano Flows Conference (MNF2014)
Subtitle of host publicationUCL, London, UK, 7-10 September 2014
EditorsC.S. Konig, T.G. Karayiannis, S. Balabani
Place of PublicationLondon
PublisherBrunel University London
Number of pages8
ISBN (Print)9781908549167
Publication statusPublished - 2014
Externally publishedYes
Event4th Micro and Nano Flows Conference 2014 - University College London, London, United Kingdom
Duration: 7 Sep 201410 Sep 2014
http://www.mnf2014.com/index.htm (Conference website.)

Conference

Conference4th Micro and Nano Flows Conference 2014
Abbreviated titleMNF2014
Country/TerritoryUnited Kingdom
CityLondon
Period7/09/1410/09/14
Internet address

Keywords

  • Heterogeneous multiscale method
  • Molecular/Continuum
  • Hybrid
  • DSMC
  • Micro gas flow

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