Multiscale simulations of sliding droplets

J. J. Derksen (Corresponding Author), A. E. Komrakova

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Abstract

We study – through numerical simulations – a droplet sliding over a solid substrate as a result of a simple shear flow. We use a free-energy lattice-Boltzmann (LB) scheme and compare its results with those of molecular dynamics (MD) simulations. According to the MD, at sufficiently low Reynolds and capillary numbers, the dimensionless sliding speed is a unique function of the equilibrium contact angle. Reproducing the MD results with LB simulations requires the use of a non-equilibrium boundary condition at the substrate and tuning a free parameter in the boundary condition.
Original languageEnglish
Pages (from-to)657-666
Number of pages10
JournalActa Mechanica
Volume230
Issue number2
Early online date30 Oct 2018
DOIs
Publication statusPublished - Feb 2019

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Keywords

  • wetting
  • immiscible liquids
  • interfacial tension
  • moving contact lines
  • molecular dynamics
  • free-energy lattice-Boltzmann method

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