Coupling heterogeneous continuum-particle fields to simulate non-isothermal microscale gas flows

Docherty, Stephanie Y. and Borg, Matthew K. and Lockerby, Duncan A. and Reese, Jason M. (2016) Coupling heterogeneous continuum-particle fields to simulate non-isothermal microscale gas flows. International Journal of Heat and Mass Transfer, 98. pp. 712-727. ISSN 0017-9310

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    Abstract

    This paper extends the hybrid computational method proposed by Docherty et al. (2014) for simulating non-isothermal rarefied gas flows at the microscale. Coupling a continuum fluid description to a direct simulation Monte Carlo (DSMC) solver, the original methodology considered the transfer of heat only, with validation performed on 1D micro Fourier flow. Here, the coupling strategy is extended to consider the transport of mass, momentum, and heat, and validation in 1D is performed on the high-speed micro Couette flow problem. Sufficient micro resolution in the hybrid method enables good agreement with an equivalent pure DSMC simulation, but the method offers no computational speed-up for this 1D problem. However, considerable speed-up is achieved for a 2D problem: gas flowing through a microscale crack is modelled as a microchannel with a high-aspect-ratio cross-section. With a temperature difference imposed between the walls of the cross-section, the hybrid method predicts the velocity and temperature variation over the cross-section very accurately; an accurate mass flow rate prediction is also obtained.

    Creators(s): Docherty, Stephanie Y., Borg, Matthew K., Lockerby, Duncan A. and Reese, Jason M. ORCID logoORCID: https://orcid.org/0000-0001-5188-1627;
    Item type:Article
    ID code:56232
    Keywords:DSMC, heat transfer, hybrid simulations, momentum transport, multiscale methods, Mechanical engineering and machinery, Mechanical Engineering, Condensed Matter Physics, Fluid Flow and Transfer Processes
    Subjects:Technology > Mechanical engineering and machinery
    Department:Faculty of Engineering > Mechanical and Aerospace Engineering
    Technology and Innovation Centre > Advanced Engineering and Manufacturing
    Depositing user: Pure Administrator
    Date deposited:28 Apr 2016 13:50
    Last modified:02 Sep 2020 03:45
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/56232
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