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Gas-kinetic simulation of sustained turbulence in minimal Couette flow

M. A. Gallis1,*, J. R. Torczynski1, N. P. Bitter1, T. P. Koehler1, S. J. Plimpton2, and G. Papadakis3

  • 1Engineering Sciences Center, Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-0840, USA
  • 2Computing Research Center, Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-1316, USA
  • 3Department of Aeronautics, Imperial College, London SW7 2AZ, United Kingdom

  • *magalli@sandia.gov
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Phys. Rev. Fluids 3, 071402(R) – Published 26 July, 2018

DOI: https://doi.org/10.1103/PhysRevFluids.3.071402

Abstract

We provide a demonstration that gas-kinetic methods incorporating molecular chaos can simulate the sustained turbulence that occurs in wall-bounded turbulent shear flows. The direct simulation Monte Carlo method, a gas-kinetic molecular method that enforces molecular chaos for gas-molecule collisions, is used to simulate the minimal Couette flow at Re=500. The resulting law of the wall, the average wall shear stress, the average kinetic energy, and the continually regenerating coherent structures all agree closely with corresponding results from direct numerical simulation of the Navier-Stokes equations. These results indicate that molecular chaos for collisions in gas-kinetic methods does not prevent development of molecular-scale long-range correlations required to form hydrodynamic-scale turbulent coherent structures.

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Phys. Rev. Fluids 3, 071402(R)– Published 26 July, 2018
  • Received 13 February 2018
Article part of CHORUS
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